Idf Date Converter
Convert Gregorian dates to Hebrew calendar dates and verified 2025–2026 holiday anchors when planning launches, support windows, or Israel-facing features.
Install
npx skills add https://github.com/skills-il/developer-tools --skill idf-date-converterWhat is this skill?
- Documents Hebrew year 5786 as a regular (non-leap) year with a single Adar
- Pins 2026 Gregorian holiday dates (Pesach, Rosh Hashana, Chanukah, fast days) from verified claim records
- Structured JSON claims with source URLs (Hebcal, Wikipedia Metonic cycle) for agent grounding
- Supports Hebrew/English SKILL variants for the same conversion rules
- Useful for deadline math around Ta'anit Esther, Purim, and national memorial days
Adoption & trust: 1 installs on skills.sh; 9 GitHub stars; 3/3 security scanners passed (skills.sh audits); trending (+100% hot-view momentum).
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Journey fit
Primary fit
Shelved under Build because builders wire scheduling, notifications, and locale logic while implementing product behavior—not during abstract ideation alone. Integrations fits date/locale utilities that agents embed in apps, cron copy, and customer comms rather than pure frontend styling.
Common Questions / FAQ
Is Idf Date Converter safe to install?
skills.sh reports 3 of 3 security scanners passed. Review the Security Audits panel on this page before installing in production.
SKILL.md
READMESKILL.md - Idf Date Converter
{ "schemaVersion": "1.0", "skill": "idf-date-converter", "generated_at": "2026-05-20T00:00:00Z", "claims": [ { "claim_id": "hebrew-year-5786-not-leap", "claim": "The Hebrew year 5786 (2025-2026 Gregorian) is a regular year in the 19-year Metonic cycle, NOT a leap year, so it has only one Adar (no Adar I / Adar II).", "source_url": "https://en.wikipedia.org/wiki/Hebrew_calendar", "raw_snippet": "19-year cycle", "fetched_at": "2026-05-20T00:00:00Z", "appears_in": ["SKILL.md", "SKILL_HE.md"] }, { "claim_id": "hebrew-2026-holiday-dates", "claim": "Hebrew calendar 2026 (Gregorian) holiday dates verified against pyluach: Tu B'Shvat (15 Shvat) = Feb 2; Ta'anit Esther (13 Adar) = Mar 2; Purim (14 Adar) = Mar 3; Shushan Purim (15 Adar) = Mar 4; Pesach (15-21 Nisan) = Apr 2-8; Yom HaShoah (27 Nisan) = Apr 14; Yom HaZikaron (4 Iyar) = Apr 21; Yom HaAtzmaut (5 Iyar) = Apr 22; Lag BaOmer (18 Iyar) = May 5; Shavuot (6 Sivan) = May 22; 17 Tammuz = Jul 3; Tisha B'Av (9 Av) = Jul 24; Rosh Hashana (1-2 Tishrei 5787) = Sep 12-13; Yom Kippur (10 Tishrei) = Sep 21; Sukkot (15-21 Tishrei) = Sep 26 - Oct 2; Simchat Torah (22 Tishrei in Israel) = Oct 3; Chanukah (25 Kislev - 2 Tevet 5787) = Dec 5-12, 2026 (first candle evening Dec 4); 10 Tevet = Dec 20, 2026.", "source_url": "https://www.hebcal.com/holidays/2026", "raw_snippet": "Pesach Shavuot Purim", "fetched_at": "2026-05-20T00:00:00Z", "appears_in": ["SKILL.md", "SKILL_HE.md"] }, { "claim_id": "pyluach-library", "claim": "pyluach is an open-source Python library for Hebrew calendar / Jewish date conversion, used as the canonical reference implementation for date arithmetic in this skill.", "source_url": "https://github.com/simlist/pyluach", "raw_snippet": "pyluach", "fetched_at": "2026-05-20T00:00:00Z", "appears_in": ["SKILL.md", "SKILL_HE.md", "scripts/convert_date.py"] }, { "claim_id": "hebcal-com", "claim": "hebcal.com is the canonical web-based Hebrew calendar reference and provides authoritative holiday tables, dual-date conversions, and a developer API at hebcal.com/home/developer-apis.", "source_url": "https://www.hebcal.com", "raw_snippet": "hebcal https://www.hebcal.com/home/developer-apis", "fetched_at": "2026-05-20T00:00:00Z", "appears_in": ["SKILL.md", "SKILL_HE.md"] }, { "claim_id": "yom-haatzmaut-displacement-2026", "claim": "5 Iyar 5786 falls on a Wednesday (April 22, 2026), so neither Yom HaZikaron nor Yom HaAtzmaut is displaced in 2026 under the Knesset's displacement rules.", "source_url": "https://www.hebcal.com/holidays/yom-haatzmaut", "raw_snippet": "Yom HaAtzmaut", "fetched_at": "2026-05-20T00:00:00Z", "appears_in": ["SKILL.md", "SKILL_HE.md"] }, { "claim_id": "knesset-displacement-laws", "claim": "The Israeli Knesset legislated displacement rules for Yom HaZikaron and Yom HaAtzmaut to avoid Shabbat desecration: if 5 Iyar falls on Friday or Saturday, both are moved earlier; if it falls on Monday, Yom HaAtzmaut moves later to Tuesday; if it falls on Sunday, Tuesday, or Wednesday, no displacement applies.", "source_url": "https://en.wikipedia.org/wiki/Yom_Ha%27atzmaut", "raw_snippet": "displacement", "fetched_at": "2026-05-20T00:00:00Z", "appears_in": ["SKILL.md", "SKILL_HE.md"] }, { "claim_id": "gematria-numerals", "claim": "Hebrew gematria uses letter-number mapping (alef=1, bet=2, ..., yod=10, kaf=20, ..., kuf=100, ..., tav=400) with two important exceptions: 15 is written tet-vav (not yod-heh) and 16 is tet-zayin (not yod-vav), to avoid spelling Divine names.", "source_url": "https://en.wikipedia.org/wiki/Hebrew_numerals", "raw_snippet": "gematria", "fetched_at": "2026-05-20T00:00:00Z", "appears_in": ["SKILL.md", "SKILL_HE.md"] }, { "claim_id": "pesach-