how to find time difference between 2 times , in milliseconds.

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rnd rnd 2018-10-23

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https://ww2.mathworks.cn/matlabcentral/answers/425676-how-to-find-time-difference-between-2-times-in-milliseconds

评论： Peter Perkins 2018-10-31

采纳的回答： jonas

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So I have a cell with a column with data like this :

.....
  '18:42:45.813'
  '18:42:46.028'
  '18:42:46.139'
  '18:42:46.359'
  '18:42:46.463'
  '18:43:06.558'
  '18:43:06.779'
....

I want to find out the time differences lets say between 2 rows,

I tried it like this: etime(datevec(datenum(c{1,2}{1,1})), datevec(datenum(c{1,2}{2,1})))

it worked great when I did not have milliseconds, my data was like this:

.....
'18:42:25'
'18:42:36'
'18:42:46'
....

but if I add data with milliseconds it gives me a wrong answer.

I want the result in milliseconds (also in seconds if possible).

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jonas 2018-10-23

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编辑：jonas 2018-10-23

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Just work with duration format.

 t={'18:42:45.813'
  '18:42:46.028'
  '18:42:46.139'
  '18:42:46.359'
  '18:42:46.463'
  '18:43:06.558'
  '18:43:06.779'};
  td = duration(t,'inputformat','hh:mm:ss.SSS');
  out = milliseconds(diff(td))

ans =

The only problem is if your time is displaying time of day, in which case you need to use datetime instead, or else you will get a large spike in your time difference at midnight.

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rnd rnd 2018-10-24

Nvm , I just use milliseconds (td(5) - td(1)) :) thank you so much , you helped me out a lot.

Peter Perkins 2018-10-31

In earlier versions, you can convert from text to duration using datevec, or using datetime+timeofday, but perhaps even easier, you can use text2duration on the FEX.

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