"Wed, 21 Jan 1970 12:33:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
12:33:57
General datetime
1970-01-21 12:33:57Z
For Database
1970-01-21 12:33:57
For HTTP1.1
Wed, 21 Jan 1970 12:33:57 GMT