Unix enthusiasts have a history of holding time_t parties to celebrate significant values of the Unix time number. These are directly analogous to the new year celebrations that occur at the change of year in many calendars. As the use of Unix time has spread, so has the practice of celebrating its milestones.
hiber@sid:~$ date -d@1234567890
Sat Feb 14 07:31:30 CST 2009
At 07:31:30 CST on February 14, 2009, a celebration is expected as the Unix time number reaches 1,234,567,890 seconds.
The next values 0x50000000 (1,342,177,280 seconds), which happens on Fri Jul 13 19:01:20 CST 2012.