"Wed, 21 Jan 1970 07:55:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
07:55:31
General datetime
1970-01-21 07:55:31Z
For Database
1970-01-21 07:55:31
For HTTP1.1
Wed, 21 Jan 1970 07:55:31 GMT