how I do header extraction from file?

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Lilya
Lilya 2017-9-8
评论： Lilya 2017-10-20
Hi all, I extracted the numeric data from .tuv file but I still need to extract the date and time which is in the form of
%TimeStamp: 2017 07 02 05 00 00
the above line is just for one file, so I want to extract it from all files. how can I do that?
Thank you so much

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Walter Roberson
Walter Roberson 2017-9-10
S = '%TimeStamp: 2017 07 02 05 00 00';
datetime(sscanf(S, '%%TimeStamp: %d%d%d%d%d%d').')

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