"Wed, 07 Jan 1970 14:49:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
14:49:21
General datetime
1970-01-07 14:49:21Z
For Database
1970-01-07 14:49:21
For HTTP1.1
Wed, 07 Jan 1970 14:49:21 GMT