"Sun, 15 Feb 1970 12:33:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
12:33:38
General datetime
1970-02-15 12:33:38Z
For Database
1970-02-15 12:33:38
For HTTP1.1
Sun, 15 Feb 1970 12:33:38 GMT