Using now() in different time zones (or with daylight saving time)
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If two people in two different time zones simultaneously used the now() function, would they get different answers? Also, does the now() result depend on whether daylight saving time is in use?
I understand now() returns the number of days since 0 Jan 0000, but does that mean "0 Jan 0000 UTC", or "0 Jan 0000 in the local time zone"?
Many thanks,
Neil
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Steven Lord
2019-12-6
If you want control over the time zone, you probably want to use datetime instead of now.
N1 = datetime('now', 'TimeZone', 'local')
N2 = datetime('now', 'TimeZone', 'America/New_York')
N3 = datetime('now', 'TimeZone', 'Europe/London')
See this documentation page for more information about working with dates and times with time zones. If you want to know if a datetime occurs during Daylight Savings Time, use isdst. When called on datetime arrays without a time zone set, isdst return false.
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Steven Lord
2019-12-6
The timezones function output for the "Etc" Area shows that Etc/UTC has 0 UTCOffset and 0 DSTOffset, so I think you're fine.
t = timezones('Etc')
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Jeremy
2019-12-6
now
Limitations
- MATLAB Online returns the current date and time in Coordinated Universal Time (UTC) rather than local time.
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Jeremy
2019-12-6
Additionally, you can use the syntax
[c tf] = clock
Where tf will be a logical that is 1 (true) if the current local date and time occur during Daylight Saving Time in your current time zone, and 0 (false) otherwise.
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