"Sat, 10 Jan 1970 19:40:10"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
19:40:10
General datetime
1970-01-10 19:40:10Z
For Database
1970-01-10 19:40:10
For HTTP1.1
Sat, 10 Jan 1970 19:40:10 GMT