Daf Yomi Data Reference

Total: 2,711 dapim

Note: Tamid in the Vilna edition starts at daf 25b, but for Daf Yomi counting purposes it has 9 dapim (25b-33b). The startDaf for Tamid should be set accordingly.

Daf Yomi Calendar Algorithm

The 14th Daf Yomi cycle began on January 5, 2020 (6 Tevet 5780) with Berakhot daf 2.

const CYCLE_14_START = new Date(2020, 0, 5); // Jan 5, 2020
const TOTAL_DAPIM = 2711;

function getTodaysDaf(date: Date = new Date()): { masechetId: string; daf: number } {
  const msPerDay = 86400000;
  const daysSinceCycleStart = Math.floor(
    (date.getTime() - CYCLE_14_START.getTime()) / msPerDay
  );
  const dayInCycle = ((daysSinceCycleStart % TOTAL_DAPIM) + TOTAL_DAPIM) % TOTAL_DAPIM;

  let accumulated = 0;
  for (const masechet of MASECHTOT) {
    if (dayInCycle < accumulated + masechet.totalDapim) {
      return { masechetId: masechet.id, daf: masechet.startDaf + (dayInCycle - accumulated) };
    }
    accumulated += masechet.totalDapim;
  }
  return { masechetId: MASECHTOT[0].id, daf: 2 };
}

Verification Points

• Jan 5, 2020 → Berakhot 2
• Mar 8, 2020 (63 days later) → Shabbat 2
• The 14th cycle ends approximately June 7, 2027

Sefaria Links

Sefaria uses English masechet names with dots and amud notation: