"Fri, 23 Jan 1970 15:08:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
15:08:21
General datetime
1970-01-23 15:08:21Z
For Database
1970-01-23 15:08:21
For HTTP1.1
Fri, 23 Jan 1970 15:08:21 GMT