"Sat, 31 Jan 1970 22:40:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
22:40:56
General datetime
1970-01-31 22:40:56Z
For Database
1970-01-31 22:40:56
For HTTP1.1
Sat, 31 Jan 1970 22:40:56 GMT