Daylight Saving Time Calculator: Is DST Active?
Check if daylight saving is active for any date and time zone, see the UTC offset and compare two zones. Includes 2025 and 2026 US and EU change dates.
Select Date, Time & Target Timezones
New York is in Daylight Saving Time
Local Time: Tuesday, July 15, 2025 at 2:00 PM · vs London: Tuesday, July 15, 2025 at 7:00 PM (5.0h behind)
Base UTC Offset
Compare UTC Offset
Time Difference Gap
Calendar Day Length
America/New York
Europe/London
12-Month Annual Offset Schedule: New_York
Step-line visualization of seasonal clock shifts. Highlighted bar represents your selected date.
The Clock Transition Mechanism
Understand how time jumps or repeats during the official 2:00 AM transition hour.
At exactly 01:59:59 AM, the clock instantly jumps ahead to 03:00:00 AM. The entire hour from 2:00 AM to 2:59 AM does not exist on this day. The calendar day contains only 23 hours, resulting in 1 hour less sleep.
Official 2025 & 2026 Daylight Saving Transition Dates
Verified against official federal statutes and international directives (Energy Policy Act of 2005 & EU Directive 2000/84/EC).
| Jurisdiction / Region | 2025 Start (Spring) | 2025 End (Fall) | 2026 Start | 2026 End | Governing Statutory Rule |
|---|---|---|---|---|---|
| United States & Canada | Mar 9, 2025 (2:00 AM → 3:00 AM) | Nov 2, 2025 (2:00 AM → 1:00 AM) | Mar 8, 2026 | Nov 1, 2026 | Second Sunday in March to first Sunday in November |
| European Union & United Kingdom | Mar 30, 2025 (1:00 AM UTC → 2:00 AM UTC) | Oct 26, 2025 (2:00 AM UTC → 1:00 AM UTC) | Mar 29, 2026 | Oct 25, 2026 | Last Sunday in March to last Sunday in October |
| Australia (NSW, VIC, SA, TAS, ACT) | Oct 5, 2025 (2:00 AM → 3:00 AM) | Apr 6, 2025 (3:00 AM → 2:00 AM) | Oct 4, 2026 | Apr 5, 2026 | First Sunday in October to first Sunday in April (Southern Hemisphere) |
| New Zealand | Sep 28, 2025 (2:00 AM → 3:00 AM) | Apr 6, 2025 (3:00 AM → 2:00 AM) | Sep 27, 2026 | Apr 5, 2026 | Last Sunday in September to first Sunday in April |
Variables Explained
UTC
Coordinated Universal Time, the absolute atomic standard from which all global civil timezones are offset.
Standard Offset
The baseline geographical UTC offset of a jurisdiction during winter months (e.g., UTC-5 for Eastern Standard Time).
Δ_DST (Daylight Shift)
Seasonal adjustment applied to local clocks, equal to +1.0 hour in observing regions and 0.0 hour elsewhere.
Effective Offset
Total difference from UTC for a specific date and time, reflecting both base longitude and active DST.
Offset Difference (ΔAB)
The instantaneous difference in hours between two timezones: Offset_A - Offset_B.
Important Notes
Geopolitical Rules: Timezone boundaries and daylight saving laws are enacted by national and sub-national legislatures and change over time. This tool relies on the authoritative IANA Time Zone Database.
Special Jurisdictions: Several regions (such as Arizona, Hawaii, Saskatchewan, Queensland, and Western Australia) do not observe daylight saving time despite neighboring provinces doing so.
Frequently Asked Questions
Related Calculators
Quick Tips
- 1Consider timezone differences
- 2Account for daylight saving time
- 3Verify date formats (MM/DD/YYYY vs DD/MM/YYYY)
- 4Use 24-hour format to avoid AM/PM confusion