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how can I add add sec, min and hours to time?

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zeezo
zeezo 2017-11-10
编辑： Felix Bl 2018-11-1
I want to add sec, min and hours to a time.
Example:
now it is 07:00:00 am and i would like to add 320 sec to be 07:05:20 am
I try "datenum" but this include a date which I don't want ?
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zeezo
zeezo 2017-11-13
Thank you Walter.
can you explain in more details?
Walter Roberson
Walter Roberson 2017-11-13
dt = datetime( '23:58:00', 'InputFormat', 'HH:mm:ss' );
dt.Format = 'HH:mm:ss';
dt + seconds(320)
ans =
datetime
00:03:20

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回答（2 个）

KL
KL 2017-11-10
Use duration maybe,
https://www.mathworks.com/help/matlab/ref/duration.html
>> t1 = duration([07 0 0])
t1 =
duration
07:00:00
>> t2 = t1+seconds(320)
t2 =
duration
07:05:20
  1 个评论
zeezo
zeezo 2017-11-13
编辑：zeezo 2017-11-13
Thank you very much.
this does not recognize the duration as a hour for example
>> t1 = duration([23 58 0])
t1 =
23:58:00
>> t2 = t1+seconds(320)
t2 =
24:03:20
it add to the duration which makes it more than 23:59:59.
I want it to be 00:03:20

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Felix Bl
Felix Bl 2018-11-1
编辑：Felix Bl 2018-11-1
This also works fine:
t1 = datestr(addtodate(datenum('07:00:00','HH:MM:SS'),320,'second'),'HH:MM:SS')

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