"Mon, 12 Jan 1970 19:43:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
19:43:40
General datetime
1970-01-12 19:43:40Z
For Database
1970-01-12 19:43:40
For HTTP1.1
Mon, 12 Jan 1970 19:43:40 GMT