"Wed, 14 Jan 1970 20:42:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
20:42:42
General datetime
1970-01-14 20:42:42Z
For Database
1970-01-14 20:42:42
For HTTP1.1
Wed, 14 Jan 1970 20:42:42 GMT