Calculate the number of days between two datetimes?

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Jussi Ikäheimo
Jussi Ikäheimo 2016-11-10
评论： Peter Perkins 2016-11-18
How to calculate the number of days between two datetimes?
days(between(day1,day2)) does not work:
"Error using days (line xxx) Input data must be a real, numeric array."

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采纳的回答

Brendan Hamm
Brendan Hamm 2016-11-10
You can do:
days(day2-day1)
The issue is that the between function returns a calendarDuration and this is measured using variable time-frames like months and years which contain different numbers of days.

更多回答（1 个）

Peter Perkins
Peter Perkins 2016-11-15
between already calculated the difference between those two dates in days:
>> d1 = datetime('yesterday'); d2 = datetime('tomorrow');
>> between(d1,d2)
ans =
calendarDuration
2d
Even more explicitly:
> between(d1,d2,'days')
ans =
calendarDuration
2d
If you then want the number 2, use caldays:
>> caldays(between(d1,d2,'days'))
ans =
2
Hope this helps.
  2 个评论
Jussi Ikäheimo
Jussi Ikäheimo 2016-11-17
It seems that the 'days' option is needed in between(), otherwise an error results.
Peter Perkins
Peter Perkins 2016-11-18
Jussi, I'm not sure what you're saying. All I wanted to demonstrate was that between gives you back a quantity that already measures the number of days. If you need a numeric value, then caldays is the function you want to apply to that, not days.

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