"Sun, 15 Feb 1970 00:03:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
00:03:06
General datetime
1970-02-15 00:03:06Z
For Database
1970-02-15 00:03:06
For HTTP1.1
Sun, 15 Feb 1970 00:03:06 GMT