Linq生成以天、小时、分钟和秒为单位的自定义周期

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        DateTime startDate = new DateTime(2022, 1, 1);
        DateTime endDate = new DateTime(2022, 1, 10);

        var days = Enumerable.Range(0, (endDate - startDate).Days + 1)
            .Select(offset => startDate.AddDays(offset));

        var hours = days.SelectMany(day => Enumerable.Range(0, 24)
            .Select(hour => day.AddHours(hour)));

        var minutes = hours.SelectMany(hour => Enumerable.Range(0, 60)
            .Select(minute => hour.AddMinutes(minute)));

        var seconds = minutes.SelectMany(minute => Enumerable.Range(0, 60)
            .Select(second => minute.AddSeconds(second)));

        foreach (var time in seconds)
        {
            Console.WriteLine(time);
        }
    }
}