"Sat, 31 Jan 1970 14:12:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
14:12:02
General datetime
1970-01-31 14:12:02Z
For Database
1970-01-31 14:12:02
For HTTP1.1
Sat, 31 Jan 1970 14:12:02 GMT