"Sun, 15 Feb 1970 12:33:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
12:33:23
General datetime
1970-02-15 12:33:23Z
For Database
1970-02-15 12:33:23
For HTTP1.1
Sun, 15 Feb 1970 12:33:23 GMT