"Sat, 31 Jan 1970 14:56:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
14:56:18
General datetime
1970-01-31 14:56:18Z
For Database
1970-01-31 14:56:18
For HTTP1.1
Sat, 31 Jan 1970 14:56:18 GMT