"Sun, 04 Jan 1970 18:14:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
18:14:15
General datetime
1970-01-04 18:14:15Z
For Database
1970-01-04 18:14:15
For HTTP1.1
Sun, 04 Jan 1970 18:14:15 GMT