"Sun, 04 Jan 1970 09:17:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
09:17:20
General datetime
1970-01-04 09:17:20Z
For Database
1970-01-04 09:17:20
For HTTP1.1
Sun, 04 Jan 1970 09:17:20 GMT