ASP.NET: Get milliseconds since 1/1/1970
You can subtract any two DateTime instances and get TimeSpan and TotalMilliseconds would give you total milliseconds. Sample below.
DateTime dt1970 = new DateTime(1970, 1, 1); DateTime current = DateTime.Now;//DateTime.UtcNow for unix timestamp TimeSpan span = current - dt1970; Console.WriteLine(span.TotalMilliseconds.ToString());one liner
//DateTime.MinValue is 01/01/01 00:00 so add 1969 years. to get 1/1/1970DateTime.Now.Subtract(DateTime.MinValue.AddYears(1969)).TotalMilliseconds;
Starting with .Net 4.6, The method ToUnixTimeMilliseconds provides more accurate solution.
From DateTimeOffset
DateTimeOffset.Now.ToUnixTimeMilliseconds()From DateTime
new DateTimeOffset(dateTime).ToUnixTimeMilliseconds()
Alternatively, you can use the Ticks property and avoid construction of a temporary object:
long epochTime = (DateTime.UtcNow.Ticks - 621355968000000000) / 10000;However, this isn't entirely
Reasoning:
DateTime d = new DateTime(1970, 01, 01);var temp = d.Ticks; // == 621355968000000000