Question

I have database where data is stored along timestamp entries, that are keys.

i need a function that can transform a date like DateTime.Now into a timestamp interval representing, for today as example, Aug 30th 00:00:00h to Aug 30th 23:59:59h.

How could i write that function?

What i want is to do something like

select all from table where timestamp is between a and b.(those and b values would represent the initial and terminal timestamps for a day.)

I did not create the db, i cannot modify it, i can only query it.

Answer 1

This will return a tuple representing the interval you probably want:

Tuple<DateTime,DateTime> GetDateInterval(DateTime datetime) {
    var start = datetime.Date;
    var end = start.AddDays(1).AddTicks(-1);
    return new Tuple<DateTime, DateTime>(start, end);
}

Usage:

var interval = GetDateInterval(DateTime.Now);
Console.WriteLine(interval.Item1);
Console.WriteLine(interval.Item2);

Output:

30.08.2011 0:00:00
30.08.2011 23:59:59