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Time and Date Calculator
Calculate date differences, or add and subtract time
A free calculator with three modes: find the exact difference between two dates or times, or add and subtract days, weeks, months, and years from a date. It correctly handles leap years, months of different lengths, and daylight saving time changes, including local times that don't exist or repeat during a clock change. Optional time zone support on each side. No sign-up, runs entirely in your browser.
Hey Product Hunt! 👋
I built this because I kept running into the same annoying problem: date math looks simple until you actually need it to be right. Months aren't the same length, leap years follow a rule almost nobody remembers, and daylight saving time can quietly throw off an hours calculation without any warning.
So I built a calculator that gets those edge cases right instead of ignoring them — it even flags when a time you enter doesn't exist or happens twice because of a clock change.
Three modes: find the difference between two dates or times, or add/subtract days, weeks, months, and years from a date. No sign-up, nothing to install, works instantly in your browser.
Would genuinely love feedback, especially if you hit a calculation that looks wrong — that's exactly the kind of thing I want to know about.
About Time and Date Calculator on Product Hunt
“Calculate date differences, or add and subtract time”
Time and Date Calculator was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #133 on the daily leaderboard. A free calculator with three modes: find the exact difference between two dates or times, or add and subtract days, weeks, months, and years from a date. It correctly handles leap years, months of different lengths, and daylight saving time changes, including local times that don't exist or repeat during a clock change. Optional time zone support on each side. No sign-up, runs entirely in your browser.
On the analytics side, Time and Date Calculator competes within Productivity, Time Tracking and Tech — topics that collectively have 1.3M followers on Product Hunt. The dashboard above tracks how Time and Date Calculator performed against the three products that launched closest to it on the same day.
Who hunted Time and Date Calculator?
Time and Date Calculator was hunted by AK Singh. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Time and Date Calculator including community comment highlights and product details, visit the product overview.
AK Singh