"Mon, 12 Jan 1970 04:40:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
04:40:50
General datetime
1970-01-12 04:40:50Z
For Database
1970-01-12 04:40:50
For HTTP1.1
Mon, 12 Jan 1970 04:40:50 GMT