"Thu, 19 Feb 1970 07:12:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700219
Only TIME
07:12:21
General datetime
1970-02-19 07:12:21Z
For Database
1970-02-19 07:12:21
For HTTP1.1
Thu, 19 Feb 1970 07:12:21 GMT