How to Sum Price from 6:00am till next day 6:00am

Question

I need to sum price from current day 6:00am till next day 6:00am ( 24hour ). The problem is what if will run my code from 6:00am till 24:00(00:00) and what if I will run it from 24:01 till 6:00am ?

Should I create two exceptions for this or I can run it with one code?

My Sql Table Contains a DateTime column.

    var date = DateTime.Now;
            if ((date.Hour>=6&& date.Minute >0) && (date.Hour <= 24 && date.Minute < 59))
            {

            }
else if ((date.Hour>=0&& date.Minute >0) && (date.Hour <= 5 && date.Minute < 59))
            {

            }

Or if I can do it immediately with a sql query?

SELECT SUM(sumtotal) from customertrans where DATEPART(HOUR, DateTime)>=6 and DATEPART(HOUR, DateTime)<=24 and DATEPART(HOUR, DateTime)=DATEPART(HOUR, GETDATE())

If hour is from 24:00 till 6:00 I need to add also the previous day from 6:00 am till 24:00

Check this approch below:

var date = DateTime.Now;
        if ((date.Hour >= 6 && date.Minute >= 0) && (date.Hour <= 23 && date.Minute <= 59))
        {
            SqlCommand cmd = new SqlCommand("Select sum(sumTotal) from customertrans where datetime>='" + DateTime.Now.ToString("MM/dd/yyyy") + "' and DateTime >= DATEPART(HOUR, '6:00') ", con);
            string test = cmd.ExecuteScalar().ToString();
            MessageBox.Show(test);
        }
        else if ((date.Hour >= 0 && date.Minute >= 0) && (date.Hour <= 5 && date.Minute <= 59))
        {
            SqlCommand cmd = new SqlCommand("Select sum(sumTotal) datetime from customertrans where datetime>='" + DateTime.Now.AddDays(-1).ToString("MM/dd/yyyy") + "' and DateTime >= DATEPART(HOUR, '6:00') ", con);
            string test = cmd.ExecuteScalar().ToString();
            MessageBox.Show(test);
        }

Answer 1

from current day 6:00am till next day 6:00am (24hour)

Not true. Some days have 23:00 and others have 25:00, so bear that in mind. Given that you are calling this from C#, I find it a bit odd that you are doing stuff with DATEPART. Why not just do a ranged query on DateTime? If the field is indexed then you will avoid a table scan.

Why not something like:

        TimeSpan cutoverTime = TimeSpan.FromHours(6); // or however you have this defined

    // DateTime.Now is unstable, and the date may change between two consecutive calls
    // so read it into a temporary variable

    DateTime currentTime = DateTime.Now;
    DateTime startTime = currentTime.Date.Add(cutoverTime); // guess today
    if (startTime > currentTime)
    {
        // ok, guessed wrong, it was yesterday
        startTime = startTime.AddDays(-1);          
    }       
    DateTime endTime = startTime.AddDays(1);

    // And use parametised queries, not string concatenation (please)
    // SELECT SUM(sumtotal) from customertrans where DateTime >= @startTime and DateTime < @endTime

A further word of caution, you need to probably be thinking about timezones, maybe doing something with respect to UTCNow instead.

Answer 2

Use this in your where statement.

WHERE date BETWEEN FORMAT(GETDATE(), 'MM/dd/yyyy') + ' 06:00' AND FORMAT(GETDATE() + 1, 'MM/dd/yyyy') + ' 06:00'

This formats the current date in MM/dd/yyyy format then appends the time of 6:00 am to it (for start date), then does the same but adds 1 (which adds 1 day) to it to get tomorrows date.

For SQL 2008 you can do this:

where date BETWEEN CONVERT(VARCHAR(10), GETDATE(), 110) + ' 06:00' AND  CONVERT(VARCHAR(10), GETDATE() + 1, 110) + ' 06:00'

Answer 3

You can try this

DateTime start = date.Date.AddHours(6);
if ((date.Hour >= 6 && date.Minute >= 0) && (date.Hour <= 23 && date.Minute <= 59))
{
     sum = Sum(start, start.AddDays(1));
}
else if ((date.Hour >= 0 && date.Minute >= 0) && (date.Hour <= 5 && date.Minute <= 59))
{
     sum = Sum(start.AddDays(-1), start);
}

Where your sum method is declared like

public int Sum(DateTime start, DateTime end)