"Thu, 15 Jan 1970 09:21:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
09:21:47
General datetime
1970-01-15 09:21:47Z
For Database
1970-01-15 09:21:47
For HTTP1.1
Thu, 15 Jan 1970 09:21:47 GMT