"Thu, 01 Jan 1970 21:44:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:44:13
General datetime
1970-01-01 21:44:13Z
For Database
1970-01-01 21:44:13
For HTTP1.1
Thu, 01 Jan 1970 21:44:13 GMT