"Tue, 20 Jan 1970 14:50:59"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
14:50:59
General datetime
1970-01-20 14:50:59Z
For Database
1970-01-20 14:50:59
For HTTP1.1
Tue, 20 Jan 1970 14:50:59 GMT