"Wed, 21 Jan 1970 11:08:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
11:08:42
General datetime
1970-01-21 11:08:42Z
For Database
1970-01-21 11:08:42
For HTTP1.1
Wed, 21 Jan 1970 11:08:42 GMT