//事前設定 const dayjs = require('dayjs') // v1.9.7 dayjs.extend(require('dayjs/plugin/timezone')) dayjs.extend(require('dayjs/plugin/utc')) dayjs.tz.setDefault('Asia/Tokyo') // 現在時刻 console.log(dayjs.tz().format()) // -> 2020-12-17T09:57:06+09:00 // from UTC console.log(dayjs.utc('2020-12-17T00:00:00Z').local().format()) // -> 2020-12-17T09:00:00+09:00
![dayjsで日本時間タイムゾーンで時刻を表示する - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/04d3dd527d34e734101b2f6a238ef34166ac94a7/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9ZGF5anMlRTMlODElQTclRTYlOTclQTUlRTYlOUMlQUMlRTYlOTklODIlRTklOTYlOTMlRTMlODIlQkYlRTMlODIlQTQlRTMlODMlQTAlRTMlODIlQkUlRTMlODMlQkMlRTMlODMlQjMlRTMlODElQTclRTYlOTklODIlRTUlODglQkIlRTMlODIlOTIlRTglQTElQTglRTclQTQlQkElRTMlODElOTklRTMlODIlOEImdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT01NiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPTU0MjJlMGVlNDU4NzRhOGVmMDA0NWUwN2QzZjQxNjlj%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBzaG9tYTJkYSZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTM2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9NDE0MGQyNWEwN2M0ZjgyMGFkNTllNjRkNGY0YzcwY2Q%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3Dd2fa4142b21db0fec6290bcaa80d6f60)