"Mon, 12 Jan 1970 23:37:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
23:37:55
General datetime
1970-01-12 23:37:55Z
For Database
1970-01-12 23:37:55
For HTTP1.1
Mon, 12 Jan 1970 23:37:55 GMT