"Tue, 27 Jan 1970 21:42:19"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
21:42:19
General datetime
1970-01-27 21:42:19Z
For Database
1970-01-27 21:42:19
For HTTP1.1
Tue, 27 Jan 1970 21:42:19 GMT