A method to generate time elapsed since a given DateTime

TimeAgo.cs

void TimeAgo(DateTime date)
{
	// 1000 millisecs = 1 sec
	// 60 secs = 1 min
	// 60 mins = 1 hr
	// 24 hrs = 1 day
	var diff = DateTime.Now - date;
	var millis = diff.TotalMilliseconds;
	var millisInDay = 86400 * 1000;
	var daysInMillis = millis / millisInDay;
	var remainder = daysInMillis % 1.0;
	var fractionInDay = remainder * 24;
	var days = Math.Floor(daysInMillis);
	var minutes = Math.Round(60 * fractionInDay);
	var hours = minutes / 60;

	if (days < 1)
	{
		if (minutes == 0)
		{
			var secs = minutes * 60;
			Console.WriteLine($"""{secs} second{(secs == 1 ? "" : "s")} ago""");
		}
		else if (minutes < 60)
		{
			Console.WriteLine($"""{minutes} minute{(minutes == 1 ? "" : "s")} ago""");
		}
		else
		{
			var hrs = Math.Floor(minutes / 60);
			var mins = Math.Round(minutes % 60);
			var hoursElapsed = $"""{hrs} hour{(hrs == 1 ? "" : "s")}""";
			
			if (mins > 0)
			{
				hoursElapsed += $""" {mins} minute{(mins == 1 ? "" : "s")}""";
			}
			
			Console.WriteLine($"""{hoursElapsed} ago""");
		}
	}
	else
	{
		var mins = Math.Round(minutes % 60);
		var years = Math.Round(days / 365);
		var timeElapsed = $"""{years} year{(years == 1 ? "" : "s")}""";
		
		if (years < 1)
		{
			timeElapsed = $"""{days} day{(days == 1 ? "" : "s")}""";
		}
		else
		{
			var daysElapsed = Math.Round((days % 365 * 24) / 24);
			timeElapsed += $""" {daysElapsed} day{(daysElapsed == 1 ? "" : "s")}""";
		}
		if (hours > 1)
		{
			var hrs = Math.Floor(hours);
			mins = Math.Round(hours % 1.0 * 60);
			timeElapsed += $""" {hrs} hour{(hrs == 1 ? "" : "s")}""";
		}
		if (mins > 0)
		{
			timeElapsed += $""" {mins} minute{(mins == 1 ? "" : "s")}""";
		}
		Console.WriteLine($"""{timeElapsed} ago""");
	}
}