ET9_WebGL_Base/CSharp/Platform/Common/Helper/TimeHelper.cs

using System;

namespace Common.Helper
{
    public static class TimeHelper
    {
        public static long EpochTimeSecond()
        {
            var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            return Convert.ToInt64((DateTime.UtcNow - epoch).TotalSeconds);
        }
    }
}