"Thu, 15 Jan 1970 18:14:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
18:14:02
General datetime
1970-01-15 18:14:02Z
For Database
1970-01-15 18:14:02
For HTTP1.1
Thu, 15 Jan 1970 18:14:02 GMT