"Wed, 14 Jan 1970 23:38:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
23:38:57
General datetime
1970-01-14 23:38:57Z
For Database
1970-01-14 23:38:57
For HTTP1.1
Wed, 14 Jan 1970 23:38:57 GMT