The time in time_t format. In Unix & C it's common to count the number of seconds past the Unix epoch as an integer. As opposed to Java which counts the number of milliseconds past the Unix epoch as an integer, or JavaScript which counts the number of milliseconds past the epoch as a floating point number. We interpret 0 was a way to say no value.
A Date
if possible, or undefined on any error.
Convert a number in time_t format into a JavaScript Date object.