"Sun, 04 Jan 1970 23:33:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
23:33:36
General datetime
1970-01-04 23:33:36Z
For Database
1970-01-04 23:33:36
For HTTP1.1
Sun, 04 Jan 1970 23:33:36 GMT