Crystal report convert number to date

I have several fields in crystal report 2011, two of them have values for Year and for month and they are number type field.
I need formula to convert this two number fields (Year and month) to date. That converted date should show year month and day. Day has to be the last date of the month.
How to do it?

Invoice_Year            Invoice_Month
2,015.00                   1.00
2,014.00                  2.00
2,014.00                  3.00
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Convert them to int, then you can convert/cast...... As text..

The day can be appended...  What formatting are you looking for yyyy-month-day?

Do you have a separate date field that can be used to handle the conversion and assembling the response field on the report?
Try this formula
Local Datevar myDate;
myDate := Date({Invoice_Year},{Invoice_Month},1);
myDate := DateAdd('m',1,myDate - 1)

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TarasAuthor Commented:
thank you, Fast and excellent as always .
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