Jantri: Sehri & Iftar Times

Jantri turns the printed Ramadan timetable into an app that knows your town, follows your masjid, and wakes you before sehri ends. The sheet handed out at the masjid has two built-in problems. It goes to the printer weeks before the month, so if the crescent is sighted a day later every date on it is one day out. And it is calculated for one set of assumptions, so a mosque a few kilometres away, or one following a different twilight angle, ends up a few minutes different from the sheet on your wall. Jantri fixes both. TIMES FOR YOUR EXACT SPOT Sehri and iftar are calculated on your phone from the sun position at your coordinates, using the same astronomy every printed timetable is built on: solar declination, the equation of time, and the hour angle at the required solar altitude. PICK THE METHOD YOUR MASJID USES Karachi 18/18 (the convention Indian jantri sheets follow), Muslim World League 18/17, ISNA 15/15, Egyptian 19.5/17.5, Umm al-Qura 18.5 with Isha 90 minutes after maghrib, Jafari and Tehran. Hanafi or Shafii Asr. Every preset explains what it means, so you can see why two timetables disagree instead of guessing. MATCH THE SHEET ON YOUR WALL Printed sheets add precaution margins. Jantri exposes them: a sehri safety margin, an iftar safety margin and a fine offset on each prayer. Set them once and the app agrees with your masjid to the minute. FOLLOW THE SIGHTING, NOT THE PRINTPRESS Ramadan day 1 defaults to the calculated Hijri date and shifts to whatever date your masjid announces. The day number, the dates and every alert move with it. ALERTS THAT ACTUALLY ARRIVE A warning before sehri ends, sehri end at Fajr, a warning before maghrib, and iftar, each with its own lead time. Alarms are scheduled with Android exact alarm API and re-armed after reboots, app updates and timezone changes. THE WHOLE MONTH, SHAREABLE A clean 30 day table with today highlighted, which you can send to family as text. THE DUAS The intention before the fast, the supplication at iftar, and the one reported after breaking the fast, each in Arabic with transliteration and translation. PRIVATE BY DESIGN No account, no ads, no analytics, no network calls. City coordinates ship inside the app and the sun position is arithmetic. Your location stays on your phone. Religious note: times are astronomical calculations. Local moon sighting decides the start of Ramadan and Eid, and mosques differ in the twilight angle and margins they use. Follow your masjid announcement where it differs, and use the controls here to match it.