datenum to UTC?
显示 更早的评论
Hi, I have
10-Oct-2013 15:59:00
and I need UTC time
1381435140
Is there any easy way? (time zone GTM-4)
Thanks!
1 个评论
Guillaume
2018-10-25
That's not UTC time, that's a Unix Time Stamp
It also appears that your input is a datetime not a datenum.
采纳的回答
James Tursa
2018-10-25
编辑：James Tursa
2018-10-25
Are you just looking for how to convert from the former to the latter? E.g.,
s = '10-Oct-2013 15:59:00';
unix_m4 = (datenum(s) - datenum('01-Jan-1970'))*86400 + 4*3600;
or
unix_m4 = seconds((datetime(s) - datetime('01-Jan-1970')) + seconds(4*3600));
or
unix_m4 = seconds(datetime(s,'timezone','-4') - datetime('01-Jan-1970','timezone','UTC'));
This result isn't called UTC btw, it is called Unix time:
更多回答（1 个）
Yes, use datetime instead of datenum.
t = datetime('10-Oct-2013 15:59:00','timezone','-04:00')
t_unix = posixtime(t)
1 个评论
Peter Perkins
2018-10-31
'-04:00' is a valid time zone, but perhaps a little dangerous. It's a time zone that does not observe4 DST. If the OP is in, say, Boston, then that would give the wrong answer for 10-Nov. Something like 'America/New_York' is probably the right choice.
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