using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var timeStart = new DateTime(2025, 1, 15, 12, 45, 18); // Start date: January 15, 2025

        var timeEnd = new DateTime(2025, 7, 25, 19, 55, 40);  // End date: July 25, 2025

        var timeGrain = "1 hour"; // Example timeGrain

​

        var periods = SplitPeriodByMonth(timeStart, timeEnd, timeGrain);

​

        // Print the periods

        foreach (var period in periods)

        {

            Console.WriteLine($"Start: {period.Start}, End: {period.End}");

        }

    }

​

    public static List<(DateTime Start, DateTime End)> SplitPeriodByMonth(DateTime timeStart, DateTime timeEnd, string timeGrain)

    {

        // Get the number of months to split from the configuration

        var monthsToSplit = 1;

        var periods = new List<(DateTime Start, DateTime End)>();

​

        var currentStart = timeStart;

        DateTime currentEnd;

​

        while (currentStart <= timeEnd)

        {

            // If timeGrain is "1 hour", calculate currentEnd by adding months directly

            if (timeGrain.Equals("1 hour", StringComparison.OrdinalIgnoreCase))

            {

                currentEnd = currentStart.AddMonths(monthsToSplit).AddTicks(-1);

            }

            else

            {

                // Default behavior: reset to the first day of the month and add months

                currentEnd = new DateTime(currentStart.Year, currentStart.Month, 1)

                    .AddMonths(monthsToSplit)

                    .AddTicks(-1);

            }

​

            // Adjust currentEnd if it exceeds timeEnd

            if (currentEnd > timeEnd)

            {

                currentEnd = timeEnd;

            }

​

            periods.Add((currentStart, currentEnd));

​

            // Move to the next period

            currentStart = currentEnd.AddTicks(1);

        }

​

        return periods;

    }

}