"Sat, 03 Jan 1970 12:03:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
12:03:23
General datetime
1970-01-03 12:03:23Z
For Database
1970-01-03 12:03:23
For HTTP1.1
Sat, 03 Jan 1970 12:03:23 GMT