"Fri, 15 May 1970 07:12:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700515
Only TIME
07:12:38
General datetime
1970-05-15 07:12:38Z
For Database
1970-05-15 07:12:38
For HTTP1.1
Fri, 15 May 1970 07:12:38 GMT