夏令时日历
查看任何时区的夏令时开始和结束日期。使用我们全面的夏令时日历，轻松应对昼夜节律的变化。
夏令时日历
追踪任何时区的夏令时转换时间。查看时钟何时拨快或拨慢，并据此安排行程。
Region: North America
无夏令时转换
Eastern Time (US) does not observe daylight saving time in 2026.
Frequently Asked Questions
Why Track DST Changes?
Plan Ahead
Know exactly when clocks change to avoid scheduling conflicts.
Global View
See DST dates for regions worldwide in one place.
Offset Changes
Understand how UTC offsets change during DST.
Avoid Confusion
Never miss a meeting due to unexpected time changes.
Understanding Daylight Saving Time
Daylight Saving Time (DST) is the practice of moving clocks forward by one hour during warmer months to extend evening daylight. Not all regions observe DST, and those that do often change dates at different times.
When Does DST Occur?
- North America - Second Sunday in March (spring forward) and first Sunday in November (fall back).
- Europe - Last Sunday in March and last Sunday in October.
- Australia - First Sunday in October and first Sunday in April (southern hemisphere seasons are opposite).
Regions Without DST
Many regions do not observe DST, including most of Africa, Asia, and South America. Notable exceptions include Arizona (excluding Navajo Nation), Hawaii, and most equatorial regions where daylight hours vary little throughout the year.