"Sun, 08 Feb 1970 04:42:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700208
Only TIME
04:42:16
General datetime
1970-02-08 04:42:16Z
For Database
1970-02-08 04:42:16
For HTTP1.1
Sun, 08 Feb 1970 04:42:16 GMT