"Sun, 11 Jan 1970 12:38:17"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
12:38:17
General datetime
1970-01-11 12:38:17Z
For Database
1970-01-11 12:38:17
For HTTP1.1
Sun, 11 Jan 1970 12:38:17 GMT