c477ff141b875a2a98c90514b6bf23f0436d1f73
Passing a year such as 1960 to mktime() will result in a negative return value. This is quite confusing, as the man page claims that on failure the call will return -1... Given that our own usec_t type is unsigned, and we can't express times before 1970 hence, let's consider all negative times returned by mktime() as invalid, regardless if just -1, or anything else negative.
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