"Wed, 07 Jan 1970 21:12:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
21:12:42
General datetime
1970-01-07 21:12:42Z
For Database
1970-01-07 21:12:42
For HTTP1.1
Wed, 07 Jan 1970 21:12:42 GMT