"Thu, 01 Jan 1970 21:45:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:45:55
General datetime
1970-01-01 21:45:55Z
For Database
1970-01-01 21:45:55
For HTTP1.1
Thu, 01 Jan 1970 21:45:55 GMT