using System;

using System.Linq;

using System.Collections.Generic;

​

var start = new DateTime(2024, 10, 01, 08, 00, 00);

var end = new DateTime(2024, 10, 20, 12, 00, 00);

​

var runtimes = new TimeSpan[] {

    new TimeSpan(06, 00, 00),

    new TimeSpan(11, 00, 00),

    new TimeSpan(15, 00, 00),

    new TimeSpan(18, 00, 00),

};

​

var daysToRun = (end.Date - start.Date).Days;

var datesToRun = Enumerable.Range(0, daysToRun + 1).Select(days => start.Date.AddDays(days));

​

var dayBlocks = datesToRun.Select(date => runtimes

    .Select((runtime, index) => {

        var startDate = date.AddDays(index == 0 ? -1 : 0);

        var startTime = index == 0 ? runtimes[^1] : runtimes[index - 1];

​

        return new Window(startDate + startTime, date + runtime);

    })

    .Where(window => window.End >= start && window.Start <= end) // Omit runs outside of start/end range

    .Select(window => window with {

        Start = new [] {window.Start, start}.Max(),

        End = new [] {window.End, end}.Min(),

    })

).Where(block => block.Any());

​

foreach (var block in dayBlocks) {

    foreach (var run in block) {

        Console.WriteLine($"""

            set "startTime={run.Start}" && set "endTime={run.End}" && call:RunAppForTime

            """);

    }

    Console.WriteLine();

}

​

record Window(DateTime Start, DateTime End);