how to shift datetime to account for daylight savings time
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The source data I am using expresses times in Coordinated Universal Time (UTC). I need to derive a MATLAB datetime array shifted correctly for daylight savings time throughout the year. It seems to me this ought to be straightforward, but I am finding this datetime business quite confusing. I simply want to shift times by one hour to account for DST. I am in the New York time zone.
If I put a datetime array into isdst, it does not return the correct answers (I get all logical zeros).
Thanks
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Star Strider
2022-3-24
Also see Specify Time Zones since it appears that ‘A different time zone offset is displayed depending on whether the datetime occurs during daylight saving time.’ according to the documentation.
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Peter Perkins
2022-3-24
Kevin, it looks like your retrieved_data.results is a cell array scalar structs containing POSIX times in their t field, in ms since 1970? Maybe? If round-off issues are a concern, you might consider using 'epochtime' and 'TicksPerSecond' instead of 'posixtime'.
In any case, if your code works for you, that's great. but there ought to be a way to vectorize this calculation down to something without loops, like maybe
results = [results{:}];
utc = [results.t];
dt = datetime(utc,'ConvertFrom','posixtime','TimeZone','America/New_York');
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