When a problem rears its head, Chrome Cow Labs leaps into action. I recently had some time-tracking chores to bring under control, and my first instinct was to write a series of calendar tools in Excel, driven by a couple of different Perpetual Calendar algorithms.

I geek, therefore I am.

Follow the link and download the spreadsheet. There is a monthly calendar, and two graphing implementations, in addition to several worksheets that expose the workings of the perpetual calendar.

For the monthly calendar and graphs, simply enter the Month and Year in the Title line, and the proper dates and days will auto-generate.

This workbook uses native Excel functions. There is no Visual Basic scripting driving the calendars.

Just remember, these calendars are only valid after 1752, probably.