Adding Seconds to DateTime with a Valid Double Results in ArgumentOutOfRangeException

Question

The following code crashes and burns and I don\'t understand why:

DateTime dt = new DateTime(1970,1,1,0,0,0,0, DateTimeKind.Utc);
double d = double.Parse(\"1         


        

Answer 1

As others have said, the problem is that the value is too large.

Having looked over it, I believe it represents milliseconds since the Unix epoch, not seconds so you want:

DateTime dt = new DateTime(1970,1,1,0,0,0,0, DateTimeKind.Utc);
double d = double.Parse("1332958778172");  // Or avoid parsing if possible :)
Console.Write(dt.AddMilliseconds(d));

Either that, or divide by 1000 before calling AddSeconds - but obviously that will lose data.

Answer 2

The value you are adding results in a date outside of the valid range of dates that a DateTime supports.

DateTime supports 01/01/0001 00:00:00 to 31/12/9999 23:59:59.

A simple calculation of 1332958778172/3600/24/365 gives 42267 years.

Answer 3

I think the double value is genuinely too large. It represents just over 42,267 years (if my maths is correct), and DateTime.MaxValue is 23:59:59.9999999, December 31, 9999

Answer 4

Looks like this timestamp is in milliseconds, try below code it should work fine.

DateTime nDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
double epoch = 1585008000000;
DateTime rDate = nDateTime.AddMilliseconds(epoch);

Answer 5

In my case I had to consume an api object as a double and convert the unix time to a DateTime:

DateTime Date = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds(Double.Parse("1596225600000"));

Answer 6

DateTime dt = new DateTime(1970,1,1,0,0,0,0, DateTimeKind.Utc);    
Console.Write(dt.AddSeconds(1332958778172D));

Except that...

1332958778172/60/60/24/365 = 42,267 years... which DateTime can only go up to 23:59:59.9999999, December 31, 9999