"Wed, 21 Jan 1970 20:36:14"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
20:36:14
General datetime
1970-01-21 20:36:14Z
For Database
1970-01-21 20:36:14
For HTTP1.1
Wed, 21 Jan 1970 20:36:14 GMT