"Sun, 11 Jan 1970 00:02:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
00:02:39
General datetime
1970-01-11 00:02:39Z
For Database
1970-01-11 00:02:39
For HTTP1.1
Sun, 11 Jan 1970 00:02:39 GMT