Add timestamp to signature

how can i add time stamp to digital signature (not pdf file. i just sign a string)

Your question is the equivalent of asking how to add a date/timestamp to a piece of paper you just signed with your pen. The answer is, write it wherever you want to write it.
A digital signature is merely cryptographically verifiable data about another block of data (the document), i.e. it certifies the document's origin (the signer) and, in the digital case, the fact that the document hasn't been altered. Signatures have nothing to do with dates, though in the real world dates are often carried along with signatures. Neither requires the other.
Arguably the best solution for you is to make the date part of the document you sign. It thus becomes verifiable, too. Beyond that, you are entirely free to devise a scheme as to how to format the date and where to place it in the document.

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