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Common/DTS.Common.Utilities/.svn/pristine/32/329af538b9f3d1444e8fb271391d3b1ce5d58b1c.svn-base

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+using System;
+
+namespace DTS.Common.Utilities
+{
+    /// <summary>
+    /// Public utilty class for manipulating Unix timestamps
+    /// Primarily exposed for the SDK
+    /// </summary>
+    public class PTP1588Timestamps
+    {
+        private const int MIN_VALID_TIMESTAMP_YEAR = 1990;
+        /// <summary>
+        /// tests time in seconds since 1,1,1970 to (unix time) to see whether the time should be valid or not
+        /// this is used by TestMetaDataList to control whether to show unix time or not for a dataset in a viewer
+        /// now it's also used by the CSV export to eliminate timestamps that occur before 1990
+        /// this was done because of a dataset in http://manuscript.dts.local/f/cases/33199/
+        /// which contained an invalid timestamp
+        /// </summary>
+        /// <param name="unixTimeStampSeconds">time in seconds since 1970-1-1</param>
+        /// <returns>true if the value is valid or not</returns>
+        public static bool IsValidTimeStamp(double unixTimeStampSeconds)
+        {
+            return UnixTimeStampToDateTimeLocal(unixTimeStampSeconds).Year > MIN_VALID_TIMESTAMP_YEAR;
+        }
+        /// <summary>
+        /// Returns DateTime object from Unix timestamp in seconds
+        /// </summary>
+        /// <param name="unixTimeStampSec"></param>
+        /// <returns></returns>
+        public static DateTime UnixTimeStampToDateTimeLocal(double unixTimeStampSec)
+        {
+            return UnixTimeStampToDateTimeLocal((decimal)unixTimeStampSec);
+        }
+        public static DateTime UnixTimeStampToDateTimeLocal(decimal unixTimeStampSec)
+        {
+            return UnitTimeStampToDateTimeLocal(unixTimeStampSec, (decimal)0);
+        }
+        public static DateTime UnitTimeStampToDateTimeLocal(double unixTimeStampSec, double ns)
+        {
+            var dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
+            dtDateTime = dtDateTime.AddSeconds(unixTimeStampSec).AddTicks(Convert.ToInt64(ns / 100));
+            return dtDateTime.ToLocalTime();
+        }
+        public static DateTime UnitTimeStampToDateTimeLocal(decimal unixTimeStampSec, decimal ns)
+        {
+            var dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
+            dtDateTime = dtDateTime.AddSeconds(Convert.ToDouble(unixTimeStampSec)).AddTicks(Convert.ToInt64(ns / 100));
+            return dtDateTime.ToLocalTime();
+        }
+        /// <summary>
+        /// String representation in Unix timestamp is seconds past epoch
+        /// </summary>
+        public static string ToDateTimeString(double unixTimeStampSec, double ns) =>
+            ToDateTimeString((decimal)unixTimeStampSec, (decimal)ns);
+
+        public static string ToDateTimeString(decimal unixTimeStampSec, decimal ns) =>
+            $"{UnixTimeStampToDateTimeLocal(unixTimeStampSec).ToUniversalTime():yyyy/MM/dd HH:mm:ss}:{ns,9:000000000}";
+    }
+}