How do I get the value of seconds in a datetime table?

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Hessa Lootah
Hessa Lootah 2020-12-3
编辑： Cris LaPierre 2020-12-3
I collected some acceleration values using the matlab application, however i don't know how to convert the timestamps to seconds elapased.
  2 个评论
dpb
dpb 2020-12-3
'Pends. Are the timestamps real time or some other measure?
If real time, then just subtract the first value from the data.
Hessa Lootah
Hessa Lootah 2020-12-3
the timestamps from the sensor came out with the date(dd:mm:yy), time in hours, min, second and millisecond.
so basically subtract the first value from the last value and figure out how long that took?

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Cris LaPierre
Cris LaPierre 2020-12-3
编辑：Cris LaPierre 2020-12-3
Ran in:
+1 to dpb's comment. Subtracting datetimes gives you a duration. You can convert your duration to your desired units - days, hours, minutes, seconds, etc by setting the duration format. See more here.
Some code taken from this example.
% Create a vetor of times
t = datetime('now') + minutes(1:0.25:3)
t = 1×9 datetime array
03-Dec-2020 23:09:58 03-Dec-2020 23:10:13 03-Dec-2020 23:10:28 03-Dec-2020 23:10:43 03-Dec-2020 23:10:58 03-Dec-2020 23:11:13 03-Dec-2020 23:11:28 03-Dec-2020 23:11:43 03-Dec-2020 23:11:58
% compute elapsed time
dt = t - t(1)
dt = 1×9 duration array
00:00:00 00:00:15 00:00:30 00:00:45 00:01:00 00:01:15 00:01:30 00:01:45 00:02:00
% convert elapsed time to seconds
dt.Format = 's'
dt = 1×9 duration array
0 sec 15 sec 30 sec 45 sec 60 sec 75 sec 90 sec 105 sec 120 sec

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