Unexpected result using Datediff

[Gerardo]

I'm trying to work with graphs and dates, in my code I'm using Datediff to
get the serial number for a given date and then graph the value. The problem
is that the difference between 04/01/2008 (mm/dd/yyyy) and 01/01/1900 is
giving the serial number of 2 days earlier. I know that I should add one to
get the serial number for April 1st 2008, instead I'm getting the serial
number for March 31st 2008.

Isn't this odd?

 

[Norman Jones]

Hi Gerardo,

See Chip Pearson at:

Dates And Times In Excel
http://www.cpearson.com/excel/datetime.htm#AddingDates

See particularly the section entitled:

How Excel Stores Dates And Times

 

[Howard Kaikow]

I'm trying to work with graphs and dates, in my code I'm using Datediff to
get the serial number for a given date and then graph the value. The problem
is that the difference between 04/01/2008 (mm/dd/yyyy) and 01/01/1900 is
giving the serial number of 2 days earlier. I know that I should add one to
get the serial number for April 1st 2008, instead I'm getting the serial
number for March 31st 2008.

Isn't this odd?

1900 was not a leap year, that may account for the difference of 1.

 

[Gerardo]

Thank you, that was interesting, the funny thing is that within a worksheet,
calculating the difference using cells works just fine.