"Sat, 31 Jan 1970 21:44:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
21:44:56
General datetime
1970-01-31 21:44:56Z
For Database
1970-01-31 21:44:56
For HTTP1.1
Sat, 31 Jan 1970 21:44:56 GMT