Work with epoch time across seconds, milliseconds and different epoch bases.
Different systems count from different zero points, so converting between them is a fixed offset. Windows FILETIME and GPS time are the two most commonly encountered alternatives to Unix time. Mixing epoch bases produces errors of decades rather than hours, which makes them easy to spot but easy to introduce when integrating systems.
Epoch Time
Unix seconds = epoch seconds + the offset between the two epoch bases
Unix seconds = epoch seconds + the offset between the two epoch bases Different systems count from different zero points, so converting between them is a fixed offset. Windows FILETIME and GPS time are the two most commonly encountered alternatives to Unix time.
Mixing epoch bases produces errors of decades rather than hours, which makes them easy to spot but easy to introduce when integrating systems.
This calculator takes 2 inputs: Epoch seconds, Epoch base. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.