All timestamps can be viewed as being both 'modulo' a period, and with a certain accuracy. some representations have minimum and maximum representable values.
date mm-ddyearday---
week n/yycenturyweek---
date yy-mm-ddcenturyday---
date AD.yyyy-mm-dd-day--approximate birth of christ
time hh:mm:ssdaysecond---
time hh:mmdayminute---
spoken time (i.e. quarter past 10)half-day15 minutes---
GetTickCount()+-50 daysmsec--process start
time()136 yearssecond1901-12-13 20:45:522038-1-19 03:14:071970-1-1 0:00