"Thu, 01 Jan 1970 21:13:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:13:16
General datetime
1970-01-01 21:13:16Z
For Database
1970-01-01 21:13:16
For HTTP1.1
Thu, 01 Jan 1970 21:13:16 GMT