"The" epoch
- Just means the starting date and time for a calendar
- Gregorian epoch is 0001-01-01 00:00:00
- Unix epoch is 1970-01-01 00:00:00 UTC
- Other OS's vary
- Perl's time() uses the OS-native epoch
- On many OS's, the epoch is a 32-bit signed int
- Unix epochs can range from 1901-12-13 to 2038-01-19