using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MP.Data
{
    public static class DateExtensions
    {
        public static DateTime Round(this DateTime date, TimeSpan span)
        {
            long ticks = (date.Ticks + (span.Ticks / 2) + 1) / span.Ticks;
            return new DateTime(ticks * span.Ticks);
        }
        public static DateTime Floor(this DateTime date, TimeSpan span)
        {
            long ticks = (date.Ticks / span.Ticks);
            return new DateTime(ticks * span.Ticks);
        }
        public static DateTime Ceil(this DateTime date, TimeSpan span)
        {
            long ticks = (date.Ticks + span.Ticks - 1) / span.Ticks;
            return new DateTime(ticks * span.Ticks);
        }
    }
}