"Sun, 15 Feb 1970 19:46:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
19:46:12
General datetime
1970-02-15 19:46:12Z
For Database
1970-02-15 19:46:12
For HTTP1.1
Sun, 15 Feb 1970 19:46:12 GMT