Convert to and from Unix time

0_DateTimeOffsetExtensions.cs

namespace Extensions
{
    using System;

    public static class DateTimeOffsetExtensions
    {
        public static DateTimeOffset FromUnixTimeSeconds(this long seconds)
        {
            var dateTimeOffset = new DateTimeOffset(new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc));
            dateTimeOffset = dateTimeOffset.AddSeconds(seconds);
            return dateTimeOffset;
        }

        public static long ToUnixTimeSeconds(this DateTimeOffset dateTimeOffset)
        {
            var unixStart = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
            var unixTimeStampInTicks = (dateTimeOffset.ToUniversalTime() - unixStart).Ticks;
            return unixTimeStampInTicks / TimeSpan.TicksPerSecond;
        }
    }
}

1_About.md

Convert to and from Unix time

Inspired by this StackOverflow thread.

For .NET 4.5 and earlier. These methods are implemented in .NET 4.6:

• DateTimeOffset.FromUnixTimeSeconds Method
• DateTimeOffset.ToUnixTimeSeconds Method