CI Date Calculator

Calculate the exact time between two dates with our free Date Calculator. Easily add or subtract days, weeks, and months, or find business days instantly.

Add the calculator to any page, post or widget area with the shortcode [ci_date_calculator].

What you enter: Start Date, End Date, Years, Months, Weeks, Days, Holiday, Month, Day.

What you get: Date, shown in years, months, weeks, days, hours, minutes, seconds.

Features:

• Works as soon as it is activated: no account, no API key and no settings page.
• Calculates in your visitor’s browser. Nothing they type is sent to calculator.io or anywhere else, and the plugin loads no ads, trackers or external scripts.
• Responsive: the form and the results sit side by side on wide pages and stack on narrow ones. The frame resizes itself to fit the calculator.
• Optional light, dark or automatic (follows the visitor’s system setting) theme, a custom accent colour and a maximum width, all set in the shortcode.
• The calculator runs in an iframe, so your theme’s styles cannot break it and it cannot break your theme.

More about this calculator: https://www.calculator.io/date-calculator/

Usage

Add the Date Calculator shortcode to your page, post or sidebar:

[ci_date_calculator]

Or add the following code to your template where you would like the Date Calculator to appear:

<?php echo do_shortcode( '[ci_date_calculator]' ); ?>

All attributes are optional:

• title – 1 (default) shows the calculator heading with its icon, 0 hides it. Example: [ci_date_calculator title="0"]
• theme – light (default), dark, or auto to follow the visitor’s light/dark system setting. Example: [ci_date_calculator theme="auto"]
• accent – an accent colour for buttons and highlights, as a hex value. Example: [ci_date_calculator accent="#2563eb"]
• max_width – the widest the calculator may be: a number followed by px, % or rem. The calculator is centred when it is narrower than its column. Example: [ci_date_calculator max_width="720px"]

Attributes can be combined: [ci_date_calculator title="0" theme="auto" accent="#2563eb" max_width="720px"]

Source code and libraries

The plugin’s own JavaScript and CSS are shipped unminified and human-readable: assets/js/*.js (except assets/js/lib/), assets/css/main.css, assets/css/ci-widget.css, assets/css/ci-embed.css and the PHP file. main.css is the compiled, unminified stylesheet of calculator.io. The calculator is also published on the calculator.io website: https://www.calculator.io/date-calculator/

Third-party libraries bundled in assets/js/lib/. Where a file is minified, the readable source is available at the upstream address:

• math.js 3.37.1 (Apache-2.0) – assets/js/lib/math.min.js, minified build. Source: https://github.com/josdejong/mathjs
• marked 15.0.12 (MIT) – assets/js/lib/marked.min.js, minified build. Source: https://github.com/markedjs/marked
• Inputmask 5.0.9-beta.70 (MIT) – assets/js/lib/input-mask.min.js, minified build. Source: https://github.com/RobinHerbots/Inputmask
• lazysizes 5.3.2 (MIT) – assets/js/lib/lazysizes.js. Source: https://github.com/aFarkas/lazysizes
• Air Datepicker 3.3.0 (MIT) – assets/js/lib/air-datepicker.js. Source: https://github.com/t1m0n/air-datepicker
• Inter font (SIL Open Font License 1.1) – assets/fonts/inter-v20-latin.woff2. Source: https://github.com/rsms/inter