Time

Just remember, you are about to pass briefly through The Twilight Zone: Nothing can happen tomorrow between 2:01 a.m. and 2:59 a.m. because those 59 minutes do not exist on March 8

clockhudsonatomicclockbuildingm36twlight

As government news releases go, this “media bulletin” sent to me, and no doubt many others via e-mail by the the province at 11:32 a.m. yesterday, sort of stretches the old journalistic notion of the word “bulletin” connoting some sense of urgency. “Daylight saving time returns to Manitoba early in the morning of Sunday, March 8, when clocks across the province will be advanced by one hour,” says the lede (journalism-speak for opening sentence or paragraph).

“Under the Official Time Act, daylight saving time begins on the second Sunday in March and continues until the first Sunday in November.

“The official time change to daylight saving time occurs at 2 a.m., Sunday, March 8 at which time clocks should be set ahead to 3 a.m.”

While it has been gradually remaining lighter later in the evening since late December here in the Northern Hemisphere, we’re about to get an even bigger early evening light boost Sunday. Tonight the sun sets at 6:19 p.m. Central Standard Time (CST). Tomorrow sunset here is at 7:21 p.m. Central Daylight Saving Time (CDT).  Presto! In the course of a single day, we’ve picked up another hour and two minutes of daylight in the evening. And by the time the spring equinox arrives March 20 here in Thompson, Manitoba at latitude 55.7433° N, we’ll be seeing about the same amount of hours of daylight as night,  with sunrise at 7:35 a.m, and sunset at 7:46 p.m. Come the summer solstice June 21, don’t be surprised if we’re out on the dock at the Paint Lake Marina, a bit south of here, fishing until almost 11 p.m., as sunset won’t be until 10:26 p.m.

For this, we can thank George Vernon Hudson, an English-born New Zealand amateur entomologist and astronomer who gave the world Daylight Saving Time (DST). Hudson’s day (and sometimes night) job was as a clerk (eventually chief clerk) in the post office in the capital of Wellington on North Island.

Standard Time, of course, with its standardized times zones, is a Canadian invention, courtesy of Sir Sandford Fleming, conveniently divided into hourly segments, and dating back to October 1884 and the International Prime Meridian Conference attended by 25 nations in Washington, D.C. Before Fleming invented standard time, noon in Kingston, Ontario was 12 minutes later than noon in Montréal and 13 minutes before noon in Toronto. Noon local time was the time when the sun stood exactly overhead.

Most of Canada’s time experts work in a place called Building M-36 (which involuntarily conjures up for me visions of the X-Files and Area 51.) They work in the Frequency and Time program in the Measurement Science and Standards portfolio with the National Research Council of Canada on Montreal Road in Ottawa. Physicist Rob Douglas, the principal research officer, however, can be found on Saskatchewan Drive in Edmonton.

Fleming’s genius was to create 24 time zones and within each zone the clocks would indicate the same time, with a one-hour difference between adjoining zones. Usually, when one travels in an easterly direction, a different time zone is crossed every 15 degrees of longitude, which is equal to one hour in time.

But  on the other side of the world in New Zealand, Hudson had a somewhat different interest a decade or so after Fleming’s development of Standard Time.  Hudson’s shift-work job gave him enough leisure time to collect insects, and led him to value after-work hours of daylight for that pursuit when he was working days. On Oct.15, 1895, spring in New Zealand, he presented a paper called “On Seasonal Time-adjustment in Countries South of Lat. 30°”  to the Wellington Philosophical Society, proposing a two-hour daylight-saving shift, and after considerable interest was expressed in Christchurch on South Island, where 1,000 copies of his paper were printed in 1896, he followed up on Oct. 8, 1898 with a second paper, “On Seasonal Time,” also presented to the  Wellington Philosophical Society in springtime, and which can be found in the Transactions and Proceedings of the Royal Society of New Zealand, housed at the National Library of New Zealand in Wellington.

While interest grew in  Hudson’s Daylight Saving Time ideas between 1895 and 1898, they were hardly greeted by a rousing show of unanimous support when he presented his first paper in Wellington on Oct. 15, 1895, according to  the abstract in Volume 28, 1895 of the Transactions and Proceedings of the Royal Society of New Zealand, which noted, “The author proposed to alter the time of the clock at the equinoxes so as to bring the working-hours of the day within the period of daylight, and by utilizing the early morning, so reduce the excessive use of artificial light which at present prevails.

“Mr. Travers said the clocks could be managed by having different hands. He did not think we were far enough advanced to adopt the plan advocated by the author of the paper.

“Mr. Harding said that the only practical part of Mr. Hudson’s paper had long since been anticipated by Benjamin Franklin, one of whose essays denounced the extravagance of making up for lost daylight by artificial light. Mr. Hudson’s original suggestions were wholly unscientific and impracticable. If he really had found many to support his views, they should unite and agitate for a reform.

“Mr. Maskell said that the mere calling the hours different would not make any difference in the time. It was out of the question to think of altering a system that had been in use for thousands of years, and found by experience to be the best. The paper was not practical.

“Mr. Hawthorne did not see any difficulty in carrying out the views advocated so ably by Mr. Hudson.

“Mr. Hustwick was of opinion that the reform spoken of would have to wait a little longer.

“Mr. Richardson said that it would be a good thing if the plan could be applied to the young people.

“Mr. Hudson, in reply, said that he was sorry to see the paper treated rather with ridicule. He intended it to be practical. It was approved of by those much in the open air. There would be no difficulty in altering the clocks.”

While Hudson may he have been somewhat discouraged by that initial reception, he was far from defeated, so he was back before the Wellington Philosophical Society with his second paper on the subject three years later in October 1898:

“In order to more fully utilize the long days of summer, it is proposed on the 1st October of each year to put the standard time on two hours by making 12 (midnight) into 2 a.m., whilst on the 1st March the time would be put back two hours by making 2 a.m. into 12 (midnight), thus reverting to the present time arrangements for the winter months,” wrote Hudson in 1898.

“The effect of this alteration would be to advance all the day’s operations in summer two hours compared with the present system. In this way the early-morning daylight would be utilised, and a long period of daylight leisure would be made available in the evening for cricket, gardening, cycling, or any other outdoor pursuit desired. It will no doubt be urged that people are at present quite at liberty to make use of the early-morning daylight in summer without any such drastic alteration in the established order of things as is here suggested. To this objection it may be pointed out that, living as we do in a social community, we are unable to separate ourselves from the habits of those around us. We cannot individually alter our times of going to bed or getting up, but must fall in with the habits of the majority – at all events, to a great extent, Again, under the present arrangement, those who desire to utilise the early-morning daylight are compelled to take some of their recreation before their daily work and some afterwards, which in many cases results in their having to forgo pursuits that they would be enabled to follow successfully if their daylight leisure were continuous  … The foregoing remarks are framed to apply to us in the Southern Hemisphere, but with the seasons reversed they’ would, of course, apply with equal force to the Northern; Hemisphere.”

While Vernon’s self interest in Daylight Saving Time stemmed at least in part from his interest in collecting insects during a  longer evening, along with such other genteel pursuits by his countrymen as  cricket, gardening and cycling, it wouldn’t be until 18 years later that his DST proposals would be implemented in a modified form in a very different military context in the midst of the First World War by  Germany and Austria at 11 p.m. on April 30, 1916, when they advanced the hands of the clock one hour until the following October.  The rationale was simple: conserve fuel needed to produce electric power. Belgium, Denmark, France, Italy, Luxembourg, Netherlands, Norway, Portugal, Sweden, Turkey and Tasmania immediately followed suit, as did Manitoba and Nova Scotia here in Canada. Britain also followed three weeks later on May 21, 1916. In 1917, Australia and Newfoundland began DST.

The United States followed on March 31, 1918 and Daylight Saving Time was observed for seven months in 1918 and 1919, but was largely unpopular and Americans used in variably and inconsistently for decades afterwards. The most recent change in the United States, pursuant to the Energy Policy Act of 2005, adding parts of March and November to DST, came into effect in 2007, and has been adopted by most Canadian jurisdictions to keep in synchronization with American business and government interests. The operative word is “most,” however, as there are a slew of Canadian exceptions to the general norm.

Most of British Columbia is on Pacific Time and observes DST, but there are two main exceptions: Part of the Peace River Regional District, including the communities of Chetwynd, Dawson Creek, Hudson’s Hope, Fort St. John, Taylor and Tumbler Ridge, are on Mountain Time and do not observe DST. This means that the region’s clocks are the same as those in Calgary and Edmonton in the winter, and they are the same as those in Vancouver in the summer.

The East Kootenay region of southeastern British Columbia, including the communities of Cranbrook, Fernie, Golden and Invermere, are  on Mountain Time and observe DST, meaning the region is always on the same time as Calgary. An exception is Creston, which observes MST year-round. Clocks in Creston match those in Calgary in the winter, and Vancouver in the summer.

While the rest of Nunavut observes DST, Southampton Island, including Coral Harbour, remains on Eastern Standard Time throughout the year. The Kitikmeot Region including Cambridge Bay observes DST but is on Mountain Time.

Most of Ontario uses DST, but Pickle Lake, New Osnaburgh, and Atikokan, located within the Central Time Zone in Northwestern Ontario, all observe Eastern Standard Time all year long.

Most of Quebec also used DST. However, the eastern part of Quebec’s North Shore, east of 63° west longitude, are in the Atlantic Time Zone, but do not observe DST for the most part, meaning in summer their clocks match those of the rest of the province, while in November, their clocks are match Atlantic Standard Time (AST) in the Maritimes. Although places east of 63° west are officially on Atlantic Time, local custom is to use Eastern Time as far east as the Natashquan River. Those communities observe DST, including all of Anticosti Island, which is bisected by the 63rd meridian. Les Îles de la Madeleine observe DST and are on Atlantic Time.

Although Saskatchewan is geographically within the Mountain Time zone, the province is officially part of the Central Time zone. As a result, while most of Saskatchewan does not change clocks spring and fall, it technically observes DST year round. This means that clocks in most of the province match clocks in Winnipeg during the winter and Calgary and Edmonton during the summer. This time zone designation was implemented in 1966, when the Saskatchewan Time Act was passed in order to standardize time province-wide. Lloydminster, which is bisected by the Saskatchewan-Alberta provincial boundary, observes Mountain Time year-round, with DST, which in the summer synchronizes it with the rest of Saskatchewan. Along the Manitoba inter-provincial boundary, the small, remote Saskatchewan municipalities of Denare Beach and Creighton unofficially observe Central Daylight Time during the summer,  keeping the same time as the larger neighbouring Town of Flin Flon here in Manitoba.

Just remember, you are about to pass briefly through The Twilight Zone. Nothing can happen tomorrow between 2:01 a.m. and 2:59 a.m. because those 59 minutes do not exist on March 8: https://www.youtube.com/watch?v=XVSRm80WzZk

You can also follow me on Twitter at: https://twitter.com/jwbarker22

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History

This Day in History, Sunday, Nov. 5, 1939: The Zossen conspiracy against Hitler collapses in Berlin and in Ottawa 75 years ago today, CBC Radio begins broadcasting the Dominion Observatory official time signal, marking 1 p.m EST

Franz Halder und Walther v. Brauchitschobservatorynrc

It was a Sunday:  Nov. 5, 1939.  In Berlin, After plotting with Franz Halder, chief of the Oberkommando des Heeres (OKH), the supreme high command of the German Army,  and Generaloberst Ludwig Beck to arrest Adolf Hitler, unless he relented on the plan for a western offensive,  Walther von Brauchitsch, the commander-in-chief of the German Army, met with Hitler to discuss the plans for an attack in the west. Von Brauchitsch argued strongly that it should not take place as scheduled on Nov. 12 (“X-day”) because of weaknesses in the German Army.  Hitler was unconvinced by the arguments, von Brauchitsch lost his nerve and returned to OKH at Zossen, where the so-called Zossen conspiracy collapsed.

Meanwhile, Col. Hans Oster of the Abwehr (German Military Intelligence), who was one of the Zossen conspirators, warned Col. Gijsbertus Jacobus (Bert) Sas, the Dutch military attaché in Berlin, of the impending invasion of the Low Countries. Sas informed the Belgian military attaché.

That same day 75 years ago today in Oslo, the German government lodged a  diplomatic protest with the neutral Norwegian government against them allowing the release of the interned SS City of Flint, a Hog Islander freighter of the United States Merchant Marine, and the first American ship captured by the Germans during the Second World War. Norway rejected the German protest.

And in Ottawa? Well, on that Sunday 75 years ago today, CBC Radio began network broadcast on Nov. 5, 1939 of the Dominion Observatory official time signal, when listeners coast-to-coast first heard an announcer intone  “the beginning of the long dash, following 10 seconds of silence” officially indicated the arrival of 1 p.m. Eastern Standard Time (EST), and is now the longest-running feature on Canada’s public broadcaster. The Canadian Broadcasting Corporation says, “Generations of CBC Radio listeners have set their watches and clocks to the familiar daily refrain, aired promptly at 12:59 p.m. Eastern Standard Time.”

The signal allowed Canadians access to exact time in a world of analog clocks. Mariners and surveyors  especially relied on an accurate time signal to calibrate their instruments for navigation and mapping.

John Bernard, discipline leader, Measurement Science and Standards, at the National Research Council of Canada (NRC), the country’s official timekeeper, which provides the correct time to the CBC, says the story of the time signal being broadcast on CBC actually has its roots as far back as 1924. Canadian National Railway (CNR) had a radio station called CKCH, which began broadcasting the time signal from the Dominion Observatory in Ottawa at 9 p.m. every day. Eventually that station was bought by the Canadian Radio Broadcasting Commission, the forerunner  to the CBC.

The “long dash” system has nothing to do with Morse code. Bernard said the system originated in the 1920s, when radio was in its infancy. “Back in the old days, when they didn’t have voice announcements, they would have certain seconds missing so that somebody who just picked up the radio broadcast would be able to identify the time of day by the code of missing seconds.” he said.

The NRC has a continuous live stream with CBC in Ottawa, and the official time is then broadcast out to each region for the official time signal. A CBC announcer then introduces the “long dash,” which is the point the NRC broadcast begins.

To determine the official time, the NRC uses atomic clocks, that use microwave signals and atoms to provide accurate time. The NRC has a minimum of three atomic clocks running at any given time to ensure that there will always be backups in case one breaks or is inaccurate. They gain only a few microseconds a year.

Still, despite being billed as 1 p.m. Eastern Standard Time, well, it’s not exactly, Bernard admits. While the NRC time is accurate, there is a “propagation delay” caused by the “satellite hop” and “buffering” of the data by CBC, causing about a third of a second delay, making it fractionally late in broadcasting the time. But close, very close, to accurate.

You can listen here to an audio clip  from its archives of the famous CBC “long dash” time feature, originally broadcast on Monday, Feb. 4, 1974: http://www.cbc.ca/archives/categories/science-technology/measurement/general-5/1939-the-beginning-of-the-long-dash.html

See related time stories at https://soundingsjohnbarker.wordpress.com/: George Vernon Hudson, Daylight Saving Time and the coming Hour of Ambiguity Nov. 2: https://soundingsjohnbarker.wordpress.com/2014/10/29/george-vernon-hudson-daylight-saving-time-and-the-coming-hour-of-ambiguity-nov-2/ and Skip a day? Why not, Samoa didhttps://soundingsjohnbarker.wordpress.com/2014/09/29/skip-a-day-why-not-samoa-did/

You can also follow me on Twitter at: https://twitter.com/jwbarker22

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Time

George Vernon Hudson, Daylight Saving Time and the coming Hour of Ambiguity Nov. 2

Hudsonclock1clockBuilding M-36

While it has been gradually getting darker earlier in the evening since late June here in the Northern Hemisphere, the fact many of us can still travel home in waning daylight from work or school in the late afternoon in late  October is in itself a credit to George Vernon Hudson, an English-born New Zealand amateur entomologist and astronomer who gave the world Daylight Saving Time (DST). Hudson’s day (and sometimes night) job was as a clerk (eventually chief clerk) in the post office in the capital of Wellington on North Island.

Standard Time, of course, with its standardized times zones, is a Canadian invention, courtesy of Sir Sanford Fleming, conveniently divided into hourly segments, and dating back to October 1884 and the International Prime Meridian Conference attended by 25 nations in Washington, D.C. Before Fleming invented standard time, noon in Kingston, Ontario was 12 minutes later than noon in Montréal and 13 minutes before noon in Toronto. Noon local time was the time when the sun stood exactly overhead.
Fleming’s genius was to create 24 time zones and within each zone the clocks would indicate the same time, with a one-hour difference between adjoining zones. Usually, when one travels in an easterly direction, a different time zone is crossed every 15 degrees of longitude, which is equal to one hour in time.

But  on the other side of the world in New Zealand, Hudson had a somewhat different interest a decade or so after Fleming’s development of Standard Time.  Hudson’s shift-work job gave him enough leisure time to collect insects, and led him to value after-work hours of daylight for that pursuit when he was working days. On Oct.15, 1895, spring in New Zealand, he presented a paper called “On Seasonal Time-adjustment in Countries South of Lat. 30°”  to the Wellington Philosophical Society, proposing a two-hour daylight-saving shift, and after considerable interest was expressed in Christchurch on South Island, where 1,000 copies of his paper were printed in 1896, he followed up on Oct. 8, 1898 with a second paper, “On Seasonal Time,” also presented to the  Wellington Philosophical Society in springtime, and which can be found in the Transactions and Proceedings of the Royal Society of New Zealand, housed at the National Library of New Zealand in Wellington.

While interest grew in  Hudson’s Daylight Saving Time ideas between 1895 and 1898, they were hardly greeted by a rousing show of unanimous support when he presented his first paper in Wellington on Oct. 15, 1895, according to  the abstract in Volume 28, 1895 of the Transactions and Proceedings of the Royal Society of New Zealand, which noted, “The author proposed to alter the time of the clock at the equinoxes so as to bring the working-hours of the day within the period of daylight, and by utilizing the early morning, so reduce the excessive use of artificial light which at present prevails.

“Mr. Travers said the clocks could be managed by having different hands. He did not think we were far enough advanced to adopt the plan advocated by the author of the paper.

“Mr. Harding said that the only practical part of Mr. Hudson’s paper had long since been anticipated by Benjamin Franklin, one of whose essays denounced the extravagance of making up for lost daylight by artificial light. Mr. Hudson’s original suggestions were wholly unscientific and impracticable. If he really had found many to support his views, they should unite and agitate for a reform.

“Mr. Maskell said that the mere calling the hours different would not make any difference in the time. It was out of the question to think of altering a system that had been in use for thousands of years, and found by experience to be the best. The paper was not practical.

“Mr. Hawthorne did not see any difficulty in carrying out the views advocated so ably by Mr. Hudson.

“Mr. Hustwick was of opinion that the reform spoken of would have to wait a little longer.

“Mr. Richardson said that it would be a good thing if the plan could be applied to the young people.

“Mr. Hudson, in reply, said that he was sorry to see the paper treated rather with ridicule. He intended it to be practical. It was approved of by those much in the open air. There would be no difficulty in altering the clocks.”

While Hudson may he have been somewhat discouraged by that initial reception, he was far from defeated, so he was back before the Wellington Philosophical Society with his second paper on the subject three years later in October 1898:

“In order to more fully utilize the long days of summer, it is proposed on the 1st October of each year to put the standard time on two hours by making 12 (midnight) into 2 a.m., whilst on the 1st March the time would be put back two hours by making 2 a.m. into 12 (midnight), thus reverting to the present time arrangements for the winter months,” wrote Hudson in 1898.

“The effect of this alteration would be to advance all the day’s operations in summer two hours compared with the present system. In this way the early-morning daylight would be utilised, and a long period of daylight leisure would be made available in the evening for cricket, gardening, cycling, or any other outdoor pursuit desired. It will no doubt be urged that people are at present quite at liberty to make use of the early-morning daylight in summer without any such drastic alteration in the established order of things as is here suggested. To this objection it may be pointed out that, living as we do in a social community, we are unable to separate ourselves from the habits of those around us. We cannot individually alter our times of going to bed or getting up, but must fall in with the habits of the majority – at all events, to a great extent, Again, under the present arrangement, those who desire to utilise the early-morning daylight are compelled to take some of their recreation before their daily work and some afterwards, which in many cases results in their having to forgo pursuits that they would be enabled to follow successfully if their daylight leisure were continuous  … The foregoing remarks are framed to apply to us in the Southern Hemisphere, but with the seasons reversed they’ would, of course, apply with equal force to the Northern; Hemisphere.”

While Vernon’s self interest in Daylight Saving Time stemmed at least in part from his interest in collecting insects during a  longer evening, along with such other genteel pursuits by his countrymen as  cricket, gardening and cycling, it wouldn’t be until 18 years later that his DST proposals would be implemented in a modified form in a very different military context in the midst of the First World War by  Germany and Austria at 11 p.m. on April 30, 1916, when they advanced the hands of the clock one hour until the following October.  The rationale was simple: conserve fuel needed to produce electric power. Belgium, Denmark, France, Italy, Luxembourg, Netherlands, Norway, Portugal, Sweden, Turkey and Tasmania immediately followed suit, as did Manitoba and Nova Scotia here in Canada. Britain also followed three weeks later on May 21, 1916. In 1917, Australia and Newfoundland began DST.  The United States followed on March 31, 1918 and Daylight Saving Time was observed for seven months in 1918 and 1919, but was largely unpopular and Americans used in variably and inconsistently for decades afterwards. The most recent change in the United States, pursuant to the Energy Policy Act of 2005, adding parts of March and November to DST, came into effect in 2007, and has been adopted by most Canadian jurisdictions to keep in synchronization with American business and government interests. The operative word is “most,” however, as there are a slew of Canadian exceptions to the general norm.

Most of British Columbia is on Pacific Time and observes DST, but there are two main exceptions: Part of the Peace River Regional District, including the communities of Chetwynd, Dawson Creek, Hudson’s Hope, Fort St. John, Taylor and Tumbler Ridge, are on Mountain Time and do not observe DST. This means that the region’s clocks are the same as those in Calgary and Edmonton in the winter, and they are the same as those in Vancouver in the summer.

The East Kootenay region of southeastern British Columbia, including the communities of Cranbrook, Fernie, Golden and Invermere, are  on Mountain Time and observe DST, meaning the region is always on the same time as Calgary. An exception is Creston, which observes MST year-round. Clocks in Creston match those in Calgary in the winter, and Vancouver in the summer.

While the rest of Nunavut observes DST, Southampton Island, including Coral Harbour, remains on Eastern Standard Time throughout the year. The Kitikmeot Region including Cambridge Bay observes DST but is on Mountain Time.

Most of Ontario uses DST, but Pickle Lake, New Osnaburgh, and Atikokan, located within the Central Time Zone in Northwestern Ontario, all observe Eastern Standard Time all year long.

Most of Quebec also used DST. However, the eastern part of Quebec’s North Shore, east of 63° west longitude, are in the Atlantic Time Zone, but do not observe DST for the most part, meaning in summer their clocks match those of the rest of the province, while in November, their clocks are match Atlantic Standard Time (AST) in the Maritimes. Although places east of 63° west are officially on Atlantic Time, local custom is to use Eastern Time as far east as the Natashquan River. Those communities observe DST, including all of Anticosti Island, which is bisected by the 63rd meridian. Les Îles de la Madeleine observe DST and are on Atlantic Time.

Although Saskatchewan is geographically within the Mountain Time zone, the province is officially part of the Central Time zone. As a result, while most of Saskatchewan does not change clocks spring and fall, it technically observes DST year round. This means that clocks in most of the province match clocks in Winnipeg during the winter and Calgary and Edmonton during the summer. This time zone designation was implemented in 1966, when the Saskatchewan Time Act was passed in order to standardize time province-wide. Lloydminster, which is bisected by the Saskatchewan-Alberta provincial boundary, observes Mountain Time year-round, with DST, which in the summer synchronizes it with the rest of Saskatchewan. Along the Manitoba inter-provincial boundary, the small, remote Saskatchewan municipalities of Denare Beach and Creighton unofficially observe Central Daylight Time during the summer,  keeping the same time as the larger neighbouring Town of Flin Flon here in Manitoba.

This year, we shift back to Standard Time from Daylight Saving Time at 2 a.m. Sunday, Nov. 2, which means an extra hour of slumber for many, but also causes me to ponder the potential complications of moving the clock back an hour and repeating the hour from 1 a.m. to 2 a.m. What happens when the clock jumps backward at 2 a.m. again to 1 a.m. for the second time that night and then repeats the hour? Would you have official log chronologies showing 1:13 a.m., 1:37 a.m., 1:56 a.m., 1:03 a.m. and 1:12 a.m. with the later two actually coming after the first three because they came after the clock fell back an hour? How would you distinguish which came first if need be, if someone needed to inspect the log months later (add the annotation 1:13 a.m. CDT or 1:03 a.m. CST?)

Most of Canada’s time experts work in a place called Building M-36 (which involuntarily conjures up for me visions of the X-Files and Area 51.) They work in the Frequency and Time program in the Measurement Science and Standards portfolio with the National Research Council of Canada on Montreal Road in Ottawa. Physicist Rob Douglas, the principal research officer, however, can be found on Saskatchewan Drive in Edmonton.

Douglas explains that “in a handwritten log the hour of ambiguity to which you refer can be simply resolved by appending the time zone (e.g. CST or CDT) to potentially ambiguous entries … e.g. “01:32 CDT” for the first pass through the hour of ambiguity and “1:32 CST” during the second pass.

“By explicitly writing the time zone as part of the time entry,” Douglas he added, “you also bypass the time acts’ defaults for official time – as you might wish to do if you are making agreements across a time zone boundary where there is the possibility of geographic ambiguity of time zone.

“The above procedure is very clear in Canada, but unfortunately less so in the USA,” said Douglas. “We in Canada can refer to ‘official’ or ‘legal’ time, which can alternate between being a ‘Standard Time’ or being a ‘Daylight Time.’ In the USA, to allow regulation by the federal government, both ‘Standard Time’ and ‘Daylight Time’ must be considered a ‘standard’ to avoid having time changes be a state responsibility under the residual powers clause of their constitution. If you think you may have to deal with the American ambiguity, it may be worthwhile to include an explanatory note in the log, such as ‘CST is defined as UTC-6h, and CDT is defined as UTC-5h.’

“If the times are being logged in a permanent logbook, with entries in chronological order for a fixed reckoning of time (i.e. in the absence of clock adjustments), then a simple way of removing the ambiguity is to include in the appropriate place in the log an entry such as “02:00 CDT – log’s clock changed from CDT to CST – 01:00 CST.

“If the log is a computer log, by using the operating system’s timestamps (for example as the time recorded for a file’s modification) the problem disappears since these timestamps are recorded as Coordinated Universal Time (UTC – the modern version of Greenwich Mean Time) which is never subjected to Standard/Daylight changes. The operating system re-interprets these timestamps into its version of the correct local time in effect for the particular UTC timestamp, and this re-interpretation may unfortunately still be expressed ambiguously, but the underlying UTC timestamp can be used to resolve any ambiguity about time zones and Daylight/Standard time.”

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