What you can calculate
Chronira brings together the date and time calculators people reach for most often. You can calculate your age in years, months and days, count the days between two dates, add or subtract business days, find today’s ISO week number, or fill in a weekly time card with overtime and gross pay. There are countdowns to holidays and birthdays, simple online timers, and a Hijri calendar section where you can convert Hijri and Gregorian dates on the Umm al-Qura calendar.
Private by design
Every calculation happens on your device. There is no account and no database, and the dates, schedules and names you type are never sent to a server. When a tool offers a share link, the values sit after the # in the address, a part of the URL that browsers do not send to servers. Anyone you send the link to can still read them, so share it only with people you trust.
Fast, and ready offline
Results update as you type, with no page reloads. You can install Chronira from your browser like an app and keep using the core tools without a connection, which is handy on a train, on a plane or in a building with poor coverage.
Clear about the rules
Each tool explains the convention it uses: whether the start day counts, what happens when a month is shorter, which public holidays are included. Pure calendar arithmetic is labelled exact. Anything that depends on an official announcement, such as the start of Ramadan, is labelled expected.