Building a full calendar UI is tough work. There are major differences between calendars on the web and calendars for mobile apps, so it’s good to study examples and see what’s out there.

After scouring through CodePen, I’ve organized the absolute best calendar UIs I could find that was created specifically for websites. All of these calendars run on CSS for the interface, although some add JavaScript functionality to create some cool interactive features.

Take a peek at these snippets and see what you think!

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Colorful Calendar UI Concept

See the Pen CSS-only Colorful Calendar Concept by David Khourshid (@davidkpiano) on CodePen.default

This first demo really grabbed my attention due to its bright color scheme and impeccable style.

Surprisingly, this colorful calendar even lets you move up & down the page with small arrow icons. The entire calendar run solely on HTML and CSS, so completely JavaScript-free.

The idea actually came from a shot on Dribbble and was coded into reality by developer David Khourshid.

Certainly a unique take on calendar design and this color scheme is one for the record books.

SVG Seasons

See the Pen SVG season calendar with animated header by Joke Gysen (@keukenrolletje) on CodePen.default

We often associate the months with seasons, and most print calendars reflect this. So why not bring that seasonal charm to your digital calendars too?

This seasonal calendar design uses custom SVGs and some basic animation to create dynamic seasonal headers. You can move between months using the arrow icons and you can even click on the dates to select them.

I’m quite fond of the date selection animation since it mimics the act of someone drawing over the date. Feels just like print without the paper!

CSS-Only Mobile Cal

The concept of this design is beyond incredible. It runs purely on CSS and lets you select a date range from a mobile calendar UI, then select whatever you want to schedule in for that date (appointments, vacations, etc).

But since this follows the idea of a mobile app UI it’s probably not the most persuasive case for CSS.

Either way, the implementation is superb, and I’m still amazed this works using just HTML and CSS.

Calendar Widget

See the Pen Calendar Widget by Ciprian Ionescu (@ciprianionescu) on CodePen.default

For this calendar widget you can actually save certain events on the calendar just by picking a date. Again it runs without JavaScript so I’m really impressed with the quality.

Developer Ciprian Ionescu uses small dots to indicate whenever something is saved on a certain date.

You can just click the calendar date to open up a small text field, enter your to-do item, then click to close.

A very simple widget that could prove useful on some sites.

Fullscreen Flat Calendar UI

See the Pen Full Screen Flat Calendar by Ricky Eckhardt (@rickyeckhardt) on CodePen.default

Here’s a design that’s much less interactive but also quite dynamic. With this fullscreen calendar you can tell that the developer Ricky Eckhardt put some effort into the project.

It does work in pure CSS but to keep the height perfectly aligned with the container, Ricky has used some necessary JavaScript. You could bypass this if you don’t need the height to fit 100% perfectly and you could instead set default paddings for the calendar elements.

Still a pretty cool effect and it even reminds me of the classic Google Calendar UI.

Square Blocks

This custom calendar is actually based on an older shot posted to Dribbble back in 2009.

It’s a clear square interface where elements are delineated by borders and custom backgrounds. Probably not the strongest use of a custom calendar but certainly a brilliant starting point for designers.

And this one is 100% pure CSS so you can get it going on any site without scripting.

Flip Animation

See the Pen Calendar Flip Animation by Gabriel Colombo (@gabrielcolombo) on CodePen.default

You don’t see custom 3D animations on calendars too often. But this one’s pretty unique because the design relies on pure CSS, yet the flip animation runs as a custom jQuery method.

If you click any of the days in the calendar it’ll perform a 3D flipping effect to rotate over to the back side. From there you can enter data for planning events or scheduling.

Realistic Planner

See the Pen Calendar by Benjamin (@maggiben) on CodePen.default

Classic skeuomorphism may have gone away but there’s plenty of room for merging minimalist designs with skeuomorphic ideas.

That’s kinda what you get in this neat planner calendar that looks like a traditional flip-top print calendar. All the months are fully dynamic and powered by JavaScript so you can move forward using the arrows on either side of the header.

Note the days aren’t clickable and that this calendar isn’t super interactive. But as a general base to start designing, I’m a fan of this concept.

Semantic Calendar UI

See the Pen Semantic UI – Calendar by KIM JONG IL (@nijin39) on CodePen.default

You can build a lot of cool stuff with the Semantic UI framework. No doubt this calendar is one such example.

Most of the interface elements are just for show but the calendar sorting features work just as you’d expect. And since this runs solely on Semantic UI the entire design is powered by that default stylesheet.

Who knew that such a powerful design could come from such a small frontend library?

Angular.js Calendar

See the Pen FlexCalendar by Russian Rebouças (@Russian60) on CodePen.default

On the flip side we have Angular.js which is one of the largest frontend frameworks. This goes beyond simple interface styles to create a structure for developers to create dynamic webapps.

And this custom calendar UI named FlexCalendar is a really cool example running on Angular. It doesn’t let you add custom content or store anything in a local JSON database or anything crazy.

But it works like an interactive calendar should, and it’s powered solely by the Angular.js library.

It’s great to see web designers dive into JavaScript and this calendar demo is one prime reason to learn.

Dark Calendar UI Alternative

See the Pen Responsive Calendar by Kenny Sing (@KennySing) on CodePen.default

Most of these calendars follow the typical white background style we’re familiar with. But what about a dark calendar UI?

Where there’s a will there’s a way and developer Kenny Sing found a way to craft this rich calendar interface from scratch.

It runs on pure CSS code has some pretty neat hover effects too. Plus the whole thing fits into a fullscreen design so it’s probably one of the more versatile calendars you’ll find.

Now, I can’t say any of these demos would be useful for a datepicker U, but they offer some great starting points for designing your own CSS-powered calendar.

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