"Thu, 15 Jan 1970 21:44:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
21:44:16
General datetime
1970-01-15 21:44:16Z
For Database
1970-01-15 21:44:16
For HTTP1.1
Thu, 15 Jan 1970 21:44:16 GMT