Time()

The current time in a Unix Timestamp: 1337285965

Mktime()

mktime() set to 2:30:45 AM on October 1, 2009: 1254382245

Checkdate()

Determining whether December 31, 2000 is a valid date: true
Determining whether February 31, 2000 is a valid date: false

Strtotime()

Now: 1337285965
15 September 2004: 1095224400
September 15, 2004: 1095224400
+1 day: 1337372365
Last Monday: 1336971600