Notes
Constructs a DateTime from the specified date and time in the local time zone.
Here are some examples:
Date myDate = Date.newInstance(2011, 11, 18);
Time myTime = Time.newInstance(3, 3, 3, 0);
DateTime dt = DateTime.newInstance(myDate, myTime);
System.debug(dt);
Output: 2011-11-18 11:03:03
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