In the past years I have created multiple After effects Calendar you might want to check out.
I tried to come up with the calendars that are mostly used in videos.

If you are looking for a specific After Effects Calendar or have other calendar animation ideas please drop a comment the end of this post.

3 After Effects Calendar Flip Templates

Option A: Days of the Month This flipping calendar shows each day of a chosen month. All 31 consecutive days are shown to promote the passage of time. The calendar slightly rotates and slightly increases in size as it levels.

Option B: Months of the year This calendar in similar to the previous one, except all the days are shown on each page and each page represents a month. The calendar also rotates in a different direction than the previous one. The red circle can be altered to emphasize a specific date each month.

Option C: Key dates per Month In this option, each page that flips represents a specific day and a month. This option is also great for people who want the months to pass at a faster pace or, for example, want to highlight a certain day as the months pass. The speed of the days passing by can be altered to go slower or faster by moving keyframes. You can also edit the style of the calendar in Illustrator if needed.

You can download the AE calendar here

4 After Effects Flipping Calendar Template

Option A: 2021 Month Calendar Flipping fast 0:04​ This is a 2021 flipping multi-color calendar where each monthly page flies away out of focus. Ideal to show the passage of time in your video.

Option B: 2020 Month Calendar Flipping fast 0:15​ This is a 2020 single color calendar flip where each monthly page flies away out of of focus. Ideal to show the passage of time in your video.

Option C: One Month Calendar 0:24​ Square Compact Calendar flipping through all days in a month. Option D: 12 Month Calendar 0:40​ Rectangular compact calendar flipping through all months and days of the year.

What’s cool about this After Effects project:
For Calendar options A and B, the layers are in illustrator so you can update the design and the content easily. The other calendars, you can edit directly in the After Effects program.

You can download the 4 After Effects animated calendar here