Check DateTime in C#, if it's happening now or in one minute (ignoring miliseconds)

DateTimeExtenions.cs

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

namespace Utils
{
	public static class DateTimeExtensions
	{
		public static bool IsInOneMinute(this DateTime eventTime)
		{
			var currnetDateTime = DateTime.UtcNow;
			var margin = currnetDateTime.AddSeconds(62);
			var range = GetRange(currnetDateTime, margin);

			return range.Contains(eventTime, new EventDateTimeComparer());
		}

		private static List<DateTime> GetRange(DateTime start, DateTime end)
		{
			var startDateTime = DateTime.UtcNow;
			var endDateTime = startDateTime.AddSeconds(62);

			var dateTimes = new List<DateTime>();

			for (var dateTime = startDateTime; dateTime < endDateTime; dateTime = dateTime.AddSeconds(1))
			{
				dateTimes.Add(dateTime);
			}
			return dateTimes;
		}
	}

	public class EventDateTimeComparer : IEqualityComparer<DateTime>
	{
		public bool Equals(DateTime x, DateTime y)
		{
			if (x.Date != y.Date) return false;
			if (x.Hour != y.Hour) return false;
			if (x.Minute != y.Minute) return false;
			if (x.Second != y.Second) return false;

			return true;
		}

		public int GetHashCode(DateTime obj)
		{
			return obj.GetHashCode();
		}
	}
}