"Mon, 12 Jan 1970 07:40:00"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
07:40:00
General datetime
1970-01-12 07:40:00Z
For Database
1970-01-12 07:40:00
For HTTP1.1
Mon, 12 Jan 1970 07:40:00 GMT