"Wed, 14 Jan 1970 04:38:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
04:38:37
General datetime
1970-01-14 04:38:37Z
For Database
1970-01-14 04:38:37
For HTTP1.1
Wed, 14 Jan 1970 04:38:37 GMT