How to get Machine time Using C#

<script type="text/javascript">
    

     function GetLocalTimeOffset(id)
     {
       var now = new Date();
       var offset = now.getTimezoneOffset();
        

        var hidTimeZone = document.getElementById(id);
        if(hidTimeZone != null)
        {
            hidTimeZone.value = offset;
        }
     }
     

    </script>

public static class DateTimeHelper
    {
        private const string dateTimeStringFormat = "dateTimeStringFormat";
        private const string timeStringFromat = "timeStringFormat";
        private const string dateStringFormat = "dateStringFormat";

        public static string GetDate(DateTime date)
        {
            string format = ConfigurationManager.AppSettings[dateStringFormat];
            return date.ToString(format, new CultureInfo("en-US"));
        }

        public static string GetDate(DateTime date, double timeZoneOffset)
        {
            string format = ConfigurationManager.AppSettings[dateStringFormat];
            return ConvertUtcToLocal(date, timeZoneOffset).ToString(format, new CultureInfo("en-US"));
        }

        public static string GetTime(DateTime time, double timeZoneOffset)
        {
            string format = ConfigurationManager.AppSettings[timeStringFromat];
            return ConvertUtcToLocal(time, timeZoneOffset).ToString(format, new CultureInfo("en-US"));
        }

        public static string GetDateTime(DateTime dateTime, double timeZoneOffset)
        {
            string format = ConfigurationManager.AppSettings[dateTimeStringFormat];
            return ConvertUtcToLocal(dateTime, timeZoneOffset).ToString(format, new CultureInfo("en-US"));
        }

        private static DateTime ConvertUtcToLocal(DateTime dateTime, double timeZoneOffset)
        {
            //Move to universal time (GMT) with Zero offset 
            DateTime utcDateTime = dateTime.ToUniversalTime();
            //Add client side offset
            return utcDateTime.AddMinutes((-1) * timeZoneOffset);
        }
    }