Check when daylight saving time starts and ends in the US for any year. Shows the exact dates and DST period length. Everything runs locally in your browser — nothing is uploaded.
Check if any year is a leap year. Enter a year to find out if it has 366 days with February 29. Everything runs locally in your browser — nothing is uploaded.
Calculate the exact duration between two times. Handles overnight time spans and displays results in hours, minutes, and seconds. Everything runs locally in your browser — nothing is uploaded.
Add or subtract hours and minutes from a starting time. Perfect for scheduling, project planning, and time tracking. Everything runs locally in your browser — nothing is uploaded.
Convert time between different time zones. Enter a time and your source/target time zones and see the converted result. Everything runs locally in your browser — nothing is uploaded.
Convert Unix timestamps to human-readable dates and back. Shows UTC, ISO 8601, locale, date, and time formats.
DST Checker (US) lets you check when daylight saving time starts and ends in the US for any year. Shows the exact dates and DST period length. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Check when daylight saving time starts and ends in the US for any year. Shows the exact dates and DST period length. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Enter one or more URLs to analyze.
Yes. After the initial page load, DST Checker (US) runs entirely on your device with no internet connection needed. All processing is done locally.
Check when daylight saving time starts and ends in the US for any year. Shows the exact dates and DST period length. Everything runs locally in your browser — nothing is uploaded. All calculations happen in your browser.
All calculators use standard mathematical formulas with high precision. Results are rounded per the calculator's conventions.
Yes for general calculations, but verify critical results independently.
No. All calculations happen in your browser — no data is stored on any server.
Meeting Time Planner
Plan meeting times across multiple timezones. Select date and time, then see the equivalent time in all selected cities simultaneously. Everything runs locally in your browser — nothing is uploaded.
Leap Year Calculator
Check if any year is a leap year. Enter a year to find out if it has 366 days with February 29. Everything runs locally in your browser — nothing is uploaded.