"Sat, 17 Jan 1970 19:44:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
19:44:13
General datetime
1970-01-17 19:44:13Z
For Database
1970-01-17 19:44:13
For HTTP1.1
Sat, 17 Jan 1970 19:44:13 GMT