first commit

Nitrox.Launcher/Models/Converters/DateToRelativeDateConverter.cs

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+using System;
+using System.Globalization;
+
+namespace Nitrox.Launcher.Models.Converters;
+
+/// <summary>
+///     Formats the bound value as a relative date string from a DateTime value.
+/// </summary>
+public class DateToRelativeDateConverter : Converter<DateToRelativeDateConverter>
+{
+    private const float DAYS_IN_YEAR = 365.2425f;
+    private const float MEAN_DAYS_IN_MONTH = DAYS_IN_YEAR / 12f;
+
+    public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        DateTimeOffset date = value switch
+        {
+            DateTime dateTime => dateTime,
+            DateTimeOffset dateTimeOffset => dateTimeOffset,
+            DateOnly dateOnly => dateOnly.ToDateTime(TimeOnly.MinValue),
+            string text when DateTimeOffset.TryParse(text, out DateTimeOffset offset) => offset,
+            _ => throw new ArgumentException($"Value must be a {nameof(DateTime)} or {nameof(DateTimeOffset)}", nameof(value))
+        };
+
+        TimeSpan delta = DateTimeOffset.UtcNow - date.UtcDateTime;
+
+        return delta switch
+        {
+            { TotalSeconds: < 1 } => "just now",
+            { TotalSeconds: < 2 } => "a second ago",
+            { TotalMinutes: < 1 } => $"{(int)delta.TotalSeconds} seconds ago",
+            { TotalMinutes: < 2 } => "a minute ago",
+            { TotalMinutes: < 45 } => $"{(int)delta.TotalMinutes} minutes ago",
+            { TotalHours: < 1.5 } => "an hour ago",
+            { TotalDays: < 1 } => $"{(int)delta.TotalHours} hours ago",
+            { TotalDays: < 2 } => "yesterday",
+            { TotalDays: < MEAN_DAYS_IN_MONTH } => $"{(int)delta.TotalDays} days ago",
+            { TotalDays: < MEAN_DAYS_IN_MONTH * 2 } => "a month ago",
+            { TotalDays: < DAYS_IN_YEAR } => $"{(int)(delta.TotalDays / MEAN_DAYS_IN_MONTH)} months ago",
+            { TotalDays: < DAYS_IN_YEAR * 2 } => "a year ago",
+            _ => $"{(int)(delta.TotalDays / DAYS_IN_YEAR)} years ago"
+        };
+    }
+}