"Wed, 14 Jan 1970 04:38:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
04:38:56
General datetime
1970-01-14 04:38:56Z
For Database
1970-01-14 04:38:56
For HTTP1.1
Wed, 14 Jan 1970 04:38:56 GMT