About MyDayStamp
We build small, fast tools for the dates that matter.
MyDayStamp started with a simple observation: the internet is full of date calculators, but most of them are cluttered, slow, or feel like they were built decades ago. We wanted something different — calculators that are fast, clear, and pleasant to use on a phone, since that's where most people actually reach for them.
Every tool on this site runs entirely in your browser. We don't ask for an account, we don't store the dates you enter, and we don't sell your data — because there isn't any to sell. You type in a date, we do the math, and that's the whole transaction.
Why "stamped" dates?
Every calculator on this site "stamps" your result the moment you calculate it — like a postmark on a letter or a ticket stub from a train ride. That's where the name comes from. A date, once calculated, becomes a small fixed record: your age in days, the countdown to an anniversary, the number of business days until a deadline. We wanted the site's visual language to reflect that — clean paper tones, a postmark motif, ticket-style result cards — rather than looking like a generic spreadsheet output.
What we actually built
MyDayStamp currently covers eleven calculators spanning the situations where people most often need to do date math by hand: age and pet age, pregnancy due dates, countdowns to a specific date, days between two dates, adding or subtracting days from a date, business-day counting that skips weekends, day-of-the-week lookups, anniversaries, retirement date planning, and time zone conversion. Each one is built as a focused, single-purpose tool rather than a bloated "everything calculator" — we think a tool that does one thing clearly beats one that tries to do twenty things poorly.
Our approach, in short: fast to load, clear to read, accurate in the math, and honest about what the tool can and can't tell you. We'd rather ship fewer calculators done well than a long list of half-finished ones.
Who's behind it
MyDayStamp is built and maintained independently, without a large team or outside investment. That means updates happen when they happen — but it also means every calculator on this site was built by someone who actually used it to check the math before publishing it, not generated at scale and left unchecked.
How we make money
This site is supported by display advertising. We don't charge for any calculator, we don't gate results behind a signup, and we don't sell user data — ad revenue is simply what keeps the lights on and funds new calculators. You can read more about how we handle data in our Privacy Policy.
If there's a calculator you wish existed, let us know.