"Thu, 15 Jan 1970 18:15:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
18:15:49
General datetime
1970-01-15 18:15:49Z
For Database
1970-01-15 18:15:49
For HTTP1.1
Thu, 15 Jan 1970 18:15:49 GMT