"Wed, 21 Jan 1970 12:31:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
12:31:56
General datetime
1970-01-21 12:31:56Z
For Database
1970-01-21 12:31:56
For HTTP1.1
Wed, 21 Jan 1970 12:31:56 GMT