Your data and preferences
Calculations run in your browser. No account is needed, and your inputs are not sent to our server.
This site has no account system and no advertising scripts. Fonts and the site’s own scripts are served locally. Visits are counted with Umami, a cookie-free analytics tool hosted at stats.admk.com, which records the page, referrer, browser, device type and country without building a profile of you. We read your browser’s time zone, not your precise physical location.
Browser storage remembers clock format, saved cities, week start, and your reading list. Session storage restores the timer in this tab. Clear this site’s browser data to remove these preferences. Storage values are not sent to us.
Requests and shared links
Loading pages sends ordinary request information, including the IP address, URL, and browser headers, to hosting infrastructure, which may keep operational logs. Shared converter URLs contain the selected dates, times, zones, and repeated-time choice; recipients, history, and hosting logs may retain them.
Downloads are generated on your device. Following an external source link takes you to a site with its own privacy practices.