"Wed, 21 Jan 1970 23:32:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
23:32:21
General datetime
1970-01-21 23:32:21Z
For Database
1970-01-21 23:32:21
For HTTP1.1
Wed, 21 Jan 1970 23:32:21 GMT