Radicade/Server/PlayerEvents/EventClock.cs

using System.Globalization;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace RadicadeServer.RecNet.Events
{
		public static class EventClock
	{
				public static DateTime FromPostedTime(DateTime posted) => posted.Kind switch
		{
			DateTimeKind.Utc => posted,
			DateTimeKind.Local => posted.ToUniversalTime(),
			_ => TimeZoneInfo.ConvertTimeToUtc(posted, TimeZoneInfo.Local)
		};

				public static string ToWire(DateTime stored) => (stored.Kind == DateTimeKind.Local
				? stored.ToUniversalTime()
				: stored)
			.ToString("yyyy-MM-dd'T'HH:mm:ss.fffffff'Z'", CultureInfo.InvariantCulture);

				public sealed class Json : JsonConverter<DateTime>
		{
			public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
				=> reader.GetString() is { } raw
					? DateTime.Parse(raw, CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind)
					: default;

			public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
				=> writer.WriteStringValue(ToWire(value));
		}
	}
}