"Sun, 15 Feb 1970 11:25:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
11:25:50
General datetime
1970-02-15 11:25:50Z
For Database
1970-02-15 11:25:50
For HTTP1.1
Sun, 15 Feb 1970 11:25:50 GMT