時區差異計算器

使用方法

1. Select a first city from the left dropdown。
2. Select a second city from the right dropdown。
3. Read the time difference displayed prominently — the tool shows which city is ahead and by how many hours。
4. Live current times for both cities update automatically。

範例

• Selecting Seoul and New York shows Seoul is 13 hours ahead of New York (during Eastern Standard Time)。
• Selecting London and London shows "Same time — no difference" and a 0 h result。