"Wed, 25 Feb 1970 00:19:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700225
Only TIME
00:19:38
General datetime
1970-02-25 00:19:38Z
For Database
1970-02-25 00:19:38
For HTTP1.1
Wed, 25 Feb 1970 00:19:38 GMT