"Sat, 31 Jan 1970 15:13:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
15:13:13
General datetime
1970-01-31 15:13:13Z
For Database
1970-01-31 15:13:13
For HTTP1.1
Sat, 31 Jan 1970 15:13:13 GMT