CODEWITHSUNDEEP
c#
user1361817
user1361817

Reputation: 41

Equivalent java cast in C#

I need help to migrate a java method:

(int)System.currentTimeMillis(); //result -186983989 (java) return diferent values

But in C# return alway the same value:

DateTime Jan1st1970 = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
TimeSpan span = DateTime.UtcNow - Jan1st1970;
Int32 resultado = (int)span.TotalMilliseconds; //result is always -2147483648 and i need same as java

It is rare becouse in debug quickwatch display the correct value, but in execution resultado is alway -2147483648

I need this -186983989 result, same as java.

Upvotes: 4

Views: 393

Answers (3)

Conrad Frix
Conrad Frix

Reputation: 52645

To mimic the overflow behavior you could do somthing using the unchecked keyword but I don't know enough about Java to know if this correct

DateTime Jan1st1970 = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
TimeSpan span = DateTime.UtcNow - Jan1st1970;

unchecked{
     int mm = Int32.MaxValue;
     mm += (int)(span.TotalMilliseconds % Int32.MaxValue);
     Console.WriteLine(mm); 
}

As an aside -2147483648 = Int32.MinValue

Upvotes: 0

Grant Winney
Grant Winney

Reputation: 66439

You'll want to use Int64 (long). Int32 isn't large enough to hold the value.

Int32.MaxValue = 2,147,483,647
Int64.MaxValue = 9,223,372,036,854,775,808

http://forums.asp.net/post/1203789.aspx

Upvotes: 3

Gaet
Gaet

Reputation: 689

TotalMilliseconds is a double, not an Int32. Might be your problem

Upvotes: 2

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