"Sun, 04 Jan 1970 01:20:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
01:20:52
General datetime
1970-01-04 01:20:52Z
For Database
1970-01-04 01:20:52
For HTTP1.1
Sun, 04 Jan 1970 01:20:52 GMT