How many days until that trip? How old will you actually be, down to the day, on your next birthday? What date lands exactly 90 days from today? Date Calculator answers all of it in seconds, with the kind of calendar-accurate precision that accounts for leap years, uneven month lengths, and every awkward edge case that makes date math trickier than it looks.

At its core, the app runs four focused tools:

- Date Difference — pick any two dates and get the gap broken down into years, months, and days, plus total days and weeks, so you can see the distance between two moments however you need to measure it.
- Age Calculator — enter a birth date and see a precise age in years, months, and days, along with a live countdown to the next birthday.
- Add/Subtract — start from any date and add or subtract days, months, or years to land on exactly the date you're looking for, with correct end-of-month handling so "Jan 31 plus one month" behaves the way a calendar actually would.
- Countdown — set a target date and watch a live day/hour/minute countdown tick down, flipping automatically to a "days since" tally once the date has passed.

Every calculation you run is quietly saved to a simple History list, so past results — whether it was someone's age, a project deadline, or a countdown to an event — stay just a tap away without you needing to redo the math.

Clean input screens, clear result breakdowns, and a single obvious button to run the calculation mean there's no hunting for the right field or wondering if the number in front of you is trustworthy. It's built for anyone who just needs a fast, correct answer to a date question — planners, expecting parents counting weeks, people tracking deadlines, or anyone who's ever stared at a calendar doing the math by hand.