"Sun, 04 Jan 1970 07:42:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
07:42:40
General datetime
1970-01-04 07:42:40Z
For Database
1970-01-04 07:42:40
For HTTP1.1
Sun, 04 Jan 1970 07:42:40 GMT