"Wed, 14 Jan 1970 18:03:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
18:03:15
General datetime
1970-01-14 18:03:15Z
For Database
1970-01-14 18:03:15
For HTTP1.1
Wed, 14 Jan 1970 18:03:15 GMT