"Sun, 15 Feb 1970 18:13:01"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
18:13:01
General datetime
1970-02-15 18:13:01Z
For Database
1970-02-15 18:13:01
For HTTP1.1
Sun, 15 Feb 1970 18:13:01 GMT