"Sun, 04 Jan 1970 04:37:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
04:37:23
General datetime
1970-01-04 04:37:23Z
For Database
1970-01-04 04:37:23
For HTTP1.1
Sun, 04 Jan 1970 04:37:23 GMT