WordPressサイトに世界時計を追加する方法（無料プラグイン）
この記事の全文は以下の英語版でご覧いただけます。
If you run a WordPress site and your audience is international, adding a world clock widget is one of the most useful things you can do. Visitors can instantly see the current time in their city — no mental math required.
Our Free WordPress Plugin
We built a free WordPress plugin that adds a customizable world clock to your site. It's lightweight, mobile-responsive, and doesn't slow down your page.
Features:
- Display current time in any city
- Add multiple clocks for different time zones
- Customizable appearance (colors, size, format)
- Automatic DST handling
- No external dependencies — works offline after initial load
Installation
- Download the plugin from our WordPress plugin page
- Go to your WordPress admin → Plugins → Add New → Upload Plugin
- Upload the .zip file and activate
- Add the widget to your sidebar or use the shortcode
[worldtime city="New York"]
Shortcode Examples
[worldtime city="New York"]— Single clock for New York[worldtime city="London" format="24"]— 24-hour format[worldtime city="Tokyo" label="Tokyo Office"]— Custom label[worldtime cities="New York,London,Tokyo"]— Multiple clocks
Alternative: Embed Our Widget
If you don't want to install a plugin, you can embed our widget directly using an iframe. See our embed guide for the code.
Why Add a World Clock?
If your site has any international audience — customers, readers, community members — a world clock is genuinely useful. It helps visitors:
- Know when your support team is available
- Convert time zones for scheduled events
- Feel like your site is built for a global audience
It's a small addition that makes a big difference for international visitors.