"Tue, 20 Jan 1970 00:18:41"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
00:18:41
General datetime
1970-01-20 00:18:41Z
For Database
1970-01-20 00:18:41
For HTTP1.1
Tue, 20 Jan 1970 00:18:41 GMT