"Wed, 21 Jan 1970 14:06:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
14:06:50
General datetime
1970-01-21 14:06:50Z
For Database
1970-01-21 14:06:50
For HTTP1.1
Wed, 21 Jan 1970 14:06:50 GMT