"Tue, 13 Jan 1970 20:41:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
20:41:43
General datetime
1970-01-13 20:41:43Z
For Database
1970-01-13 20:41:43
For HTTP1.1
Tue, 13 Jan 1970 20:41:43 GMT