"Tue, 20 Jan 1970 15:07:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
15:07:55
General datetime
1970-01-20 15:07:55Z
For Database
1970-01-20 15:07:55
For HTTP1.1
Tue, 20 Jan 1970 15:07:55 GMT