convert number to date

i am tapping into an excel sheet as my database source.  I have a settlement date column that is in MM/DD/YY format but when its pulled down into crystal reports it shows the date serial instead of the date format...and crystal thinks its a number so its not letting me change formatting to date.  So I figure I could just use a formula field to convert the number to date format...i know you can do this with string, but how about numbers?

for string i know you can do the following:
date(tonumber(left({table.datestring},4)),tonumber(mid({table.datestring},5,2)),tonumber(right({table.datestring},2)))

how can I work this for numbers to date?
IO_DorkAsked:
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FlysterCommented:
Have you tried:

 Format(tonumber,"mm/dd/yy")

Flyster
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IO_DorkAuthor Commented:
no i have not, how is that incorporated/used?
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mlmccCommented:
WHat is it showing in Crystal?
Can you give an example?

mlmcc
0
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IO_DorkAuthor Commented:
in excel the date is 7/9/97, in cyrstal that same date is displayed as 35,620.00
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richlandoCommented:
stringvar stryear;
stringvar strmonth;
stringvar strday;

strday:= {table.datestring}[5 to 6];
strmonth:= {table.datestring}[3 to 4];
stryear:= {table.datestring}[1 to 2];

if yyear < "50" then
date(tonumber(stryear)+2000,tonumber(strmonth),tonumber(stryear))
else
date(tonumber(stryear)+1900,tonumber(strmonth),tonumber(stryear))
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mlmccCommented:
That looks like the number of days since 31 Dec 1899

Try this formula

DateSerial(1899,12,{YourField}+30)

Another one is

DateAdd('d',{YourField},Date(1899,12,31))

mlmcc
0

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mlmccCommented:
richlando - The field is a number not a string.

mlmcc
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IO_DorkAuthor Commented:
that worked perfectly (the first dateserial formula you suggested).
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