"Sun, 04 Jan 1970 12:38:19"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
12:38:19
General datetime
1970-01-04 12:38:19Z
For Database
1970-01-04 12:38:19
For HTTP1.1
Sun, 04 Jan 1970 12:38:19 GMT