"Tue, 20 Jan 1970 00:54:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
00:54:49
General datetime
1970-01-20 00:54:49Z
For Database
1970-01-20 00:54:49
For HTTP1.1
Tue, 20 Jan 1970 00:54:49 GMT