C# – The Daylight Saving Time (DST) issue

Hey guys!

The DST are a real pain in the ass for all developers.

But I have got a little something for you! A DateTime extension method which will return the number of hours for the current Date.

public static int GetNumberOfActualHours(this DateTime dateTime)
{
    var hours = 24;

    var start = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, 1, 0, 0, DateTimeKind.Local);
    var end = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, 4, 0, 0, DateTimeKind.Local);

    if ((!start.IsDaylightSavingTime()) && (end.IsDaylightSavingTime()))
        hours--;
    else if ((start.IsDaylightSavingTime()) && (!end.IsDaylightSavingTime()))
        hours++;

    return (hours);
}

Happy coding!

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