Embed a small monthly calendar into your spreadsheet for reference and entering dates. This app for Excel is particularly useful for working with time sheets, schedules, project plans, logs, and ledgers where you frequently need to refer to a calendar. The date picking function makes it easy to enter dates or the current time into the currently selected cell. You can highlight dates in the calendar by selecting a range of dates in your spreadsheet. You can also toggle the size of the calendar, show week numbers, change the calendar system (U.S. or ISO), and choose a different theme (blue, green, etc.).