Photo by Rob OâNeal/Florida Keys Tourist Development Council. Wherever you are right now, chances are the weather is better here in the Florida Keys. Thatâs true even on a summer day. The hottest itâs ever been in Key West is 97Â° F (36Â° C), and that was way back in 1880. At the peak of summer, the average high is 89Â° F (32Â° C).
To count the days before a date, you can use the TODAY function. Example. The example may be easier to understand if you copy it to a blank worksheet. Create a blank workbook or worksheet. Select the example in the Help topic. Note: Do not select the row or column headers.
So for dates before 03/01/1900, the Excel number is effectively the number of days after 12/31/1899. However, Excel will not format any number below 0 (-1 gives you ##########) and so this only matters for 01/00/1900 to 02/28/1900, making it easier to just use the 12/30/1899 date as a base.f you change the format of the cells to General then this will show the date value of a cell as behind the scenes Excel saves a date as the number of days since 01/01/1900. If your date is text and you need to convert it then DATEVALUE will do this: share | improve this answer. answered Nov 1 '13 at 8:05.