Date & Time
Countdown · Anniversaries · World clock
Tools
Current Time
Live time, anywhereTime Elapsed
Time between two momentsAdd or Subtract Days
Date after or before N daysCountdown (D-Day)
Days until or since a dateAnniversary
Milestones and yearly countsAge Calculator
Your exact age todayDays Between Dates
Days from one date to anotherStopwatch
Measure elapsed timeTimestamp converter
Unix time ↔ date
Which tool do I need?
Date arithmetic goes wrong by exactly one day, because the answer depends on whether the start date counts, whether a leap day falls inside, whether the clocks changed. These 9 tools state the rule they used, and every calculation runs in your browser.
- Days remaining or elapsed: D-day (with a choice of counting rule), anniversary milestones.
- Between two points: date difference (including a weekday-only count), elapsed time to the second with daylight saving handled.
- Moving a date: add or subtract days, weeks, months and years, falling back to month-end when the day does not exist.
- Clock side: current time around the world, stopwatch, age calculator, Unix timestamp converter.
Why do tools sometimes disagree?
Because the counting rules differ: a difference excludes the start date, a "day N" count includes it, and age counts only completed years. This site says which rule it used, so a number never misleads on its own.
Can I exclude public holidays?
Only weekends are removed. Holidays vary by country, change every year and carry substitution rules, so they cannot be handled accurately — and a confident wrong number is worse than none.