About DateRuler

DateRuler is a collection of small, useful calculators for everyday date questions. Whether you are planning an event, counting working days, checking an age, or finding an ISO week number, the answer should be only a few clicks away.

What makes the tools different?

Our tools focus on immediate results, clear assumptions, and minimal data collection. The calculations are performed on your own device, without a login or API connection. For calendar math, we use stable Gregorian date arithmetic so daylight-saving changes do not unexpectedly add or remove a day.

What DateRuler does not do

DateRuler is not a legal deadline service, employment-law advice, or a public holiday calendar. Working-day calculations exclude weekends but do not assume local holidays. If a deadline has legal or contractual consequences, verify it with the relevant authority.

Keep exploring

Explore all ten free tools or start with the days between dates calculator.