A few weeks ago I was given the task to close a program on a server, but we had know idea when the last user logged into the program. The server is Linux and records time as milliseconds since January 01, 1970. This Epoch is known as Unix Time the date is the beginning of time according to Unix. This measure of time is recorded as int32. The max value of a 32 bit integer is 2147483647. So the end of time will be January 19, 2038, until this reference date is recorded as int64.
The last log in was: 1299611945 March 08, 2011 11:19:05 AM. The program now can be removed.
Here is a link to a good Epoch Converter http://www.epochconverter.com/