"Sat, 17 Jan 1970 00:19:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
00:19:13
General datetime
1970-01-17 00:19:13Z
For Database
1970-01-17 00:19:13
For HTTP1.1
Sat, 17 Jan 1970 00:19:13 GMT