"Sun, 15 Feb 1970 15:05:53"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
15:05:53
General datetime
1970-02-15 15:05:53Z
For Database
1970-02-15 15:05:53
For HTTP1.1
Sun, 15 Feb 1970 15:05:53 GMT