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Time change did not go as expected this weekend!


tjwilli_58 Nov 6, 2023 04:33 PM

I'm trying to have my datalogger be on UTC time and also have an extra column with local time using the DaylightSavingUS() instruction. Using the Bonus Tip from Daylight Saving Time and Your Data Logger (campbellsci.com), I set my Loggernet to use GMT. I then added a column for local time using the idea from UTC and Local Data tables simultaneously - Campbell Scientific User Forums. This seemed to work just fine.

Daylight Saving TIme ended this past weekend (05-Nov-2023 at 2AM), so I went from Eastern Daylight TIme to Eastern Standard time. This morning I went to check and sure enough, my local time is now 5 hours behind UTC instead of 4 as it was last week. However, it looks like the time actually changed at 02:00 UTC (or what I thought was UTC).

"TIMESTAMP","RECORD","TmStamp_Local",
"TS","RN","TS",
"","","Smp",
"2023-11-05 01:50:00",1295,"2023-11-04 21:50:00",
"2023-11-05 01:55:00",1296,"2023-11-04 21:55:00",
"2023-11-05 02:00:00",1297,"2023-11-04 21:00:00",
"2023-11-05 01:05:00",1298,"2023-11-04 20:05:00",
"2023-11-05 01:10:00",1299,"2023-11-04 20:10:00",

What did I do wrong? I did not set UTC offset in the datalogger itself, but I thought the LoggerNet Server setting to use GMT would handle that.

 Here is the code snippet I used to get the local time:

    UTCOffset = 5*3600-DaylightSavingUS(-1)
    TmStamp_Local = Public.TimeStamp(1,1) - UTCOffset

 

 

  Sample (1,TmStamp_Local,Nsec)

 


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