2020 is a leap year starting on a Wednesday. If you save old calendars to display when the dates line up correctly again, you’re out of luck unless your collection extends back to 1992. However, calendars for 2014, 2003 and 1997 will be correct in 2020 for January and February1, and those for 2015, 2009 and 1998 will work for the rest of the year.