"Wed, 21 Jan 1970 09:21:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
09:21:51
General datetime
1970-01-21 09:21:51Z
For Database
1970-01-21 09:21:51
For HTTP1.1
Wed, 21 Jan 1970 09:21:51 GMT