"Sun, 11 Jan 1970 14:42:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
14:42:47
General datetime
1970-01-11 14:42:47Z
For Database
1970-01-11 14:42:47
For HTTP1.1
Sun, 11 Jan 1970 14:42:47 GMT