Some math is done here and there with time_t directly as an int

[jimklimov]

Parts of code such as upsmon assume that time_t is an integer or wider (which TBH it often is, but is not guaranteed to by standard) and compare timeouts elapsing, etc. by direct arithmetics. The portable way is to use difftime() or some such standard routines.

[clepple]

There might be some time-related commits in the Vaclav branch: #10