"Wed, 11 Feb 1970 00:20:27"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700211
Only TIME
00:20:27
General datetime
1970-02-11 00:20:27Z
For Database
1970-02-11 00:20:27
For HTTP1.1
Wed, 11 Feb 1970 00:20:27 GMT