KennyLisc · August 29, 2015 14:25 · Jul 23, 2015
diff --git a/DateTimeOffsetExtensions.cs b/DateTimeOffsetExtensions.cs
@@ -0,0 +1,37 @@
+using System;
+
+namespace InTheHand
+{
+    /// <summary>
+    /// Helper class for DateTimeOffset.
+    /// </summary>
+    public static class DateTimeOffsetHelper
+    {
+        private static DateTimeOffset dt = new DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero);
+
+        /// <summary>
+        /// Converts a Unix time expressed as the number of seconds that have elapsed since 1970-01-01T00:00:00Z to a DateTimeOffset value. 
+        /// </summary>
+        /// <param name="seconds">A Unix time, expressed as the number of seconds that have elapsed since 1970-01-01T00:00:00Z (January 1, 1970, at 12:00 AM UTC).
+        /// For Unix times before this date, its value is negative.</param>
+        /// <returns>A date and time value that represents the same moment in time as the Unix time. </returns>
+        public static DateTimeOffset FromUnixTimeSeconds(long seconds)
+        {
+            return dt.AddSeconds(seconds);
+        }
+
+        /// <summary>
+        /// Returns the number of seconds that have elapsed since 1970-01-01T00:00:00Z. 
+        /// </summary>
+        /// <param name="date">The DateTimeOffset value.</param>
+        /// <returns>The number of seconds that have elapsed since 1970-01-01T00:00:00Z. </returns>
+        /// <remarks>Unix time represents the number of seconds that have elapsed since 1970-01-01T00:00:00Z (January 1, 1970, at 12:00 AM UTC).
+        /// It does not take leap seconds into account.
+        /// <para>This method first converts the current instance to UTC before returning its Unix time.
+        /// For date and time values before 1970-01-01T00:00:00Z, this method returns a negative value.</para></remarks>
+        public static long ToUnixTimeSeconds(this DateTimeOffset date)
+        {
+            return Convert.ToInt64(date.Subtract(dt).TotalSeconds);
+        }
+    }
+}
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