The operating system starting time that is used as a beginning
point to determine the computers current time and date by counting
the number of ticks that have elapsed
since the epoch. Below is a listing of different operating systems
and their associated tick and epoch.
| Operating System |
Tick |
Epoch |
| Apple Mac OS |
1
sec |
January 1, 1904 to February 6, 2040 |
| Microsoft DOS |
1
sec |
January 1, 1980 to January 1, 2108 |
| Microsoft Windows |
100
ns |
January 1, 1601 to AD 30828 |
| OpenVMS |
100
ns |
November 17, 1858 to AD 31086 |
| POSIX |
1
sec |
January 1, 1970 to January 19, 2038 |
| S/390 |
244.14 picosec |
January 1, 1970 to January 19, 2038 |
| Unix |
1
sec |
January 1, 1970 to January 19, 2038 |
- If your computer is getting set back to the starting Epoch
time or you're loosing time see
document CH000386 for
additional information about this issue.
Also see: Measurement,
Operating system definitions,
Programming definitions,
Tick, Time
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| Resolved |
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