Not exactly code, but documentation.
info ps | grep -B34 -A3 stime:
Note all the "see also ... stime" things? Well... guess what isn't described by the manpage.
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stimeisn't relevant, and all the other things in the "see also" lists are referring to other fields that
pscan be instructed to output, as in
-o stimeactually does display... something, but it looks like it's an alias for
NOREPRO on mac, but, from your screenshot, if the analogy with
cstimeis anything to go by,
stimemay be system time (Which might be different to start time, but why I don't know).