"Wed, 21 Jan 1970 05:52:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
05:52:57
General datetime
1970-01-21 05:52:57Z
For Database
1970-01-21 05:52:57
For HTTP1.1
Wed, 21 Jan 1970 05:52:57 GMT