How Can I Calculate the Date of the Next Weekday in .NET?

Determining the Date of an Upcoming Weekday in .NET

The concept of "the next weekday" can be ambiguous, as it depends on the current day of the week. Here are a few ways to approach this in C# using the .NET library:

"The Next Tuesday to Occur, or Today if It's Already Tuesday"

This approach returns the closest Tuesday, which is either today or a future date:

DateTime today = DateTime.Today;
int daysUntilTuesday = ((int)DayOfWeek.Tuesday - (int)today.DayOfWeek + 7) % 7;
DateTime nextTuesday = today.AddDays(daysUntilTuesday);

"A Week's Time from Now, Even if it's Already Tuesday"

This approach returns the next Tuesday, but skips a week if it's already Tuesday:

int daysUntilTuesday = (((int)DayOfWeek.Monday - (int)today.DayOfWeek + 7) % 7) + 1;

"Tomorrow or the Next Tuesday to Occur, or Tomorrow if It's Tuesday"

This approach returns the next Tuesday, but starts from tomorrow to avoid an extra week's delay:

DateTime tomorrow = DateTime.Today.AddDays(1);
int daysUntilTuesday = ((int)DayOfWeek.Tuesday - (int)tomorrow.DayOfWeek + 7) % 7;
DateTime nextTuesday = tomorrow.AddDays(daysUntilTuesday);

Versatile Method for Any Weekday

To handle any weekday, create a generic method GetNextWeekday that takes a DateTime and a DayOfWeek as input:

public static DateTime GetNextWeekday(DateTime start, DayOfWeek day)
{
    int daysToAdd = ((int) day - (int) start.DayOfWeek + 7) % 7;
    return start.AddDays(daysToAdd);
}

Usage Examples

• Today or in the next 6 days:

DateTime nextTuesday = GetNextWeekday(DateTime.Today, DayOfWeek.Tuesday);

• Next Tuesday excluding today:

DateTime nextTuesday = GetNextWeekday(DateTime.Today.AddDays(1), DayOfWeek.Tuesday);

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