The 'Calendar' input type allows you to enter dates using a calendar. In the example below, the red shaded cell in the Excel spreadsheet will be formatted as a calendar input.
To assign a calendar as the input type for a cell, select "Calendar" from the drop down menu as shown in the screenshot below.
To proceed with the conversion press "Next". The final output will look like this :
Picture of an open calendar created using SpreadsheetWEB.