日付変更線
conceptEmbed This Widget
Add the script tag and a data attribute to embed this widget.
<script src="https://cdn.jsdelivr.net/npm/timefyi-embed@1/dist/embed.min.js" defer></script>
<div data-timefyi="glossary" data-slug="international-date-line"></div>Embed via iframe for maximum compatibility.
<iframe src="https://timefyi.com/iframe/glossary/international-date-line/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://timefyi.com/glossary/international-date-line/Add a dynamic SVG badge to your README or docs.
[](https://timefyi.com/glossary/international-date-line/)Use the native HTML custom element.
<script src="https://cdn.jsdelivr.net/npm/timefyi-embed@1/dist/embed.min.js" defer></script>
<timefyi-glossary slug="international-date-line"></timefyi-glossary>定義
おおよそ経度180度に沿った仮想の線で、ここを境に日付が変わる。西方向に越えると1日加わり、東方向に越えると1日減る。