To add two datetime arrays , with millisecond values

Question

Srey 2021-11-7

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评论： Srey 2021-11-8

I have a datetime array a=[ 09:39:12.000, 09:39:12.000] and another datetime array with b= [ 0:00:00.001, 0:00:00.002]

I want answer as [09:39:12.001, 09:39:12.002]. FIrst value of a added to first value of b, and so on.

It is showing 'Addition is not defined between datetime arrays'. Is there any way to add the hh:mm:ss of first array to .SSS of second array

Is there any way to add the 2 datetime arrays? Please help.

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Answer 1

Stephen23 2021-11-7

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编辑：Stephen23 2021-11-7

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You should be storing those times as duration objects (not as datetime objects) so you could simply add them. The solution to your task is to convert them to duration objects, which can be simply added together:

a = datetime(0,0,0,[9;9],[39;39],[12;12],'Format','HH:mm:ss.SSS') % better as DURATION
a = 2×1 datetime array
   09:39:12.000
   09:39:12.000
b = datetime(0,0,0,0,0,[0.001;0.002],'Format','HH:mm:ss.SSS') % better as DURATION
b = 2×1 datetime array
   00:00:00.001
   00:00:00.002
c = timeofday(a)+timeofday(b);
c.Format = 'hh:mm:ss.SSS'
c = 2×1 duration array
   09:39:12.001
   09:39:12.002

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Srey 2021-11-8

Thats a lot, It worked!!

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Answer 2

Steven Lord 2021-11-7

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You cannot add two datetime arrays as the error message indicates. If addition of datetime arrays was defined, what would be the value of (tomorrow + next Tuesday)?

You can add two duration arrays (as Stephen shows) or a duration and a datetime.

x = minutes(45);
y = minutes(30);
n = datetime('now')
n = datetime
   07-Nov-2021 21:34:58
z = x+y % 75 minutes
z = duration
   75 min
w = n + y % half an hour from now
w = datetime
   07-Nov-2021 22:04:58