System.Double.Parse Inaccurate?

I've got a section of code in my app that keeps track of how much time an employee has accrued, which equals out to 1.33 days of PTO per month. I'm trying to store the time accrued so far in an XML file. I have no problems writing to and reading from the XML file and all my values are correct. The problem I'm having is my calculation never amounts to 1.33, it goes from 1.32999999999997 to 1.3743333333333. on the next run. My calculation is int TimePerDay = 1.33 / DateTime.DaysInMonth(DateTime.Parse(DateTime.Now.ToShortDateString()).Year, DateTime.Parse(DateTime.Now.ToShortDateString()).Month); I save the difference of that calculation in the XML file, and then retrieve it again when the calculation is necessary. Here is the code: int TimeCount = System.Double.Parse(xmlDoc.ChildNodes.Item(1).ChildNodes.Item(1).InnerText); //the first time I retrieve this value, it will be initially set to 0.0443333333333333 the first time this code runs TimeCount += 1.33 / DateTime.DaysInMonth(DateTime.Parse(DateTime.Now.ToShortDateString()).Year, DateTime.Parse(DateTime.Now.ToShortDateString()).Month); xmlDoc.Save(Path); Like I said the problem is that the calculation never amounts to 1.33 - I have ran it many times in a for loop without ever converting it to a string value. The for loop eventually calculates to 1.33, and it stops at 1.33 and displays that fact in a MessageBox. I think I may be having a problem with the System.Double.Parse parser . . . anybody got any idea's? :)