"Sat, 03 Jan 1970 21:46:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
21:46:13
General datetime
1970-01-03 21:46:13Z
For Database
1970-01-03 21:46:13
For HTTP1.1
Sat, 03 Jan 1970 21:46:13 GMT