How can I get the next particular day after a month in c#,
for example if today is Monday I need to get the first Monday after 1 month from now, but in more generic way, for example if today is 17/11/2021 which is Wednesday I need to get the first Wednesday after a month from now
I am using this function but it will return for next week and not next month
public static DateTime GetNextWeekday(DateTime start, DayOfWeek day)
{
// The (... + 7) % 7 ensures we end up with a value in the range [0, 6]
int daysToAdd = ((int)day - (int)start.DayOfWeek + 7) % 7;
return start.AddDays(daysToAdd);
}
>Solution :
Typical month has 30 or 31 days, however, the next same day of week will be after either 28 (4 * 7) or 35 (5 * 7) days. We need a compromise. Let for February add 28 days and for all the other months add 35 days:
public static DateTime GetSameDayAfterMonth(DateTime start) =>
start.AddDays((start.AddMonths(1) - start).TotalDays < 30 ? 28 : 35);
Sure, you can elaborate other rules: say, if when add 28 days we are still in the same month (1 May + 28 days == 29 May) we should add 35:
public static DateTime GetSameDayAfterMonth(DateTime start) =>
start.AddDays(start.Month == start.AddDays(28).Month ? 35 : 28);