DD.WellWorkover.Cloud/ConsoleApp1/Program.cs

using AsbCloudDb.Model;
using AsbCloudInfrastructure.Services.DailyReport;
using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;

namespace ConsoleApp1
{
    class Cron
    {
        public DateTimeOffset Origin { get; set; }
        public TimeSpan Period { get; set; }

        public DateTimeOffset Next()
        {
            var delta = DateTimeOffset.Now - Origin;
            var n = Math.Ceiling(delta / Period);
            return Origin + n * Period;
        }
    }

    class Program
    {
        static void Main(/*string[] args*/)
        {
            // use ServiceFactory to make services
            var op = ServiceFactory.MakeWellOperationsService();
            var d = op.FirstOperationDate(90);

            var period = TimeSpan.FromHours(5);
            var c = new Cron
            {
                Period = period,
                Origin = new DateTimeOffset(2022, 5, 8, 0, 0, 7, TimeSpan.FromHours(5)),
            };

            Console.WriteLine($"origin: {c.Origin}   next: {c.Next()}");

            Console.WriteLine("End of Test");
            Console.ReadLine();
        }
    }
}