"Mon, 09 Feb 1970 19:40:27"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700209
Only TIME
19:40:27
General datetime
1970-02-09 19:40:27Z
For Database
1970-02-09 19:40:27
For HTTP1.1
Mon, 09 Feb 1970 19:40:27 GMT