"Mon, 19 Jan 1970 04:42:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
04:42:55
General datetime
1970-01-19 04:42:55Z
For Database
1970-01-19 04:42:55
For HTTP1.1
Mon, 19 Jan 1970 04:42:55 GMT