How to get a list of all possible Periods (with start Date and end Date) by day interval from another Start-Date and End-Date in C#

Question

I have a start Date : 01-01-2019 and End-Date 31-12-2019

I need to get all possible periods between those dates, but by interval.

Interval can be 180, 90, 45, 15 , 7 and 1 days.

So if I select 180 days return should be a list with those periods:

1. 01/01/2019 - 30/06/2019 (First period of generated list )

2. 01/07/2019 - 31/12/2019 (Second period of generated list )

It is almost like Generate list of list for start and end date of week from date range But I need do this in C#

How to find a list of Dates from a Start-Date and End-Date Is not quite What I need. But is close.

DateTime startDate = DateTime.Parse("01/01/2019");
DateTime endDate = DateTime.Parse("31/12/2019");

dayInterval = 45;             

startDate = startDate.AddDays(dayInterval);
endDate = endDate.AddDays(-dayInterval);

I also tried:

var startDate = new DateTime(2019, 1, 1);
var endDate = new DateTime(2019, 12, 31);
int days = 45;

List<DateTime> range = Enumerable.Range(0, days)
    .Select(i => startDate.AddDays(i))
    .ToList();

Answer 1

Maybe try write that code like this:

tatic IEnumerable<DateTime> GetAllDatesAndInitializeTickets(DateTime startDate, DateTime endDate)
{
    List<DateTime> allDates = new List<DateTime>();


    for (DateTime i = startDate; i <= endDate; i = i.AddDays(45))
    {
        allDates.Add(i);
    }
    return allDates.AsReadOnly();
}

Answer 2

The solution proposed here is what I need Split date range into date range chunks

public static IEnumerable<Tuple<DateTime, DateTime>> SplitDateRange(DateTime start, DateTime end, int dayChunkSize)
    {
        DateTime chunkEnd;
        while ((chunkEnd = start.AddDays(dayChunkSize)) < end)
        {
            yield return Tuple.Create(start, chunkEnd);
            start = chunkEnd;
        }
        yield return Tuple.Create(start, end);
    }