Facepunch.Steamworks/Facepunch.Steamworks/Utility/Epoch.cs

using System;

namespace Steamworks
{
	static internal class Epoch
	{
		private static readonly DateTime epoch = new DateTime( 1970, 1, 1, 0, 0, 0, DateTimeKind.Utc );

		/// <summary>
		/// Returns the current Unix Epoch
		/// </summary>
		public static int Current => (int)(DateTime.UtcNow.Subtract( epoch ).TotalSeconds);

		/// <summary>
		/// Convert an epoch to a datetime
		/// </summary>
		public static DateTime ToDateTime( decimal unixTime ) => epoch.AddSeconds( (long)unixTime );

		/// <summary>
		/// Convert a DateTime to a unix time
		/// </summary>
		public static uint FromDateTime( DateTime dt ) => (uint)(dt.Subtract( epoch ).TotalSeconds);
	}
}