"Wed, 21 Jan 1970 18:24:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
18:24:50
General datetime
1970-01-21 18:24:50Z
For Database
1970-01-21 18:24:50
For HTTP1.1
Wed, 21 Jan 1970 18:24:50 GMT