"Tue, 20 Jan 1970 02:27:34"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
02:27:34
General datetime
1970-01-20 02:27:34Z
For Database
1970-01-20 02:27:34
For HTTP1.1
Tue, 20 Jan 1970 02:27:34 GMT