"Sun, 08 Feb 1970 12:02:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700208
Only TIME
12:02:23
General datetime
1970-02-08 12:02:23Z
For Database
1970-02-08 12:02:23
For HTTP1.1
Sun, 08 Feb 1970 12:02:23 GMT