convert time stamp into minutes or seconds

Question

Lizan 2014-7-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/139647-convert-time-stamp-into-minutes-or-seconds

回答： David Sanchez 2014-7-1

I have a file with

06.2014   09:53:37      -1.8
06.2014   09:58:36      -2.0
06.2014   10:39:01      -2.0

I would like to covert the second column into how long time past from the first readout in the column, in minutes or seconds and plot column 2 and 3. Matlab doesn't seem to be able to handle the ':' sign. How do I do this?

Many thanks!

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Answer 1

Jos (10584) 2014-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/139647-convert-time-stamp-into-minutes-or-seconds#answer_143141

在 MATLAB Online 中打开

I assume the 3rd column represents a value.

[D,T,V] = textread('MyFile.txt','%s%s%f')
DT = datevec(strcat(D,'-',T),'dd.mm.yyyy-HH:MM:ss') % convert to matlab time vectors
dTsec = arrayfun(@(k) etime(DT(k,:),DT(1,:)),1:size(DT,1)) % relative time in seconds