@hebcal/core
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    Class Molad

    Represents a molad — the calculated moment when the new moon is "born" for a given Hebrew month.

    The molad is announced in synagogue on Shabbat Mevarchim (the Shabbat before Rosh Chodesh) and is the anchor point for Kiddush Levana zmanim. Calculations use the traditional chalakim arithmetic (1 hour = 1080 chalakim) anchored to Molad Tohu BaHaRaD.

    import {Molad, months} from '@hebcal/core';
    const m = new Molad(5784, months.NISAN);
    console.log(m.getMonthName()); // 'Nisan'
    console.log(m.getHour(), m.getMinutes(), m.getChalakim()); // 22 57 7
    console.log(m.render('en')); // 'Molad Nisan: Monday, 10:57pm and 7 chalakim'
    Index
    constructor
    getChalakim getDow getHour getInstant getMinutes getMoladDate getMonth getMonthName getSofZmanKidushLevana15Days getSofZmanKidushLevanaBetweenMoldos getTchilasZmanKidushLevana3Days getTchilasZmanKidushLevana7Days getYear render

    • Calculates the molad for a given Hebrew year and month.

      Parameters

      • year: number

        Hebrew year

      • month: number

        1=NISAN, 7=TISHREI (uses Nisan-based numbering)

      Returns Molad

    • Returns number

      parts of a minute (0-17)

    • Returns number

      Day of Week (0=Sunday, 6=Saturday)

    • Returns the moment of the molad as a Temporal.ZonedDateTime in the UTC zone.

      The molad is computed in Jerusalem standard time and then converted, so the returned instant is correct year-round; only the zone of the returned object is UTC. This method subtracts 20.94 minutes (20 minutes and 56.496 seconds) from the computed time — Har Habayis, at longitude 35.2354°, is 5.2354° away from the multiple-of-15 timezone longitude — to get to standard time. Daylight savings time is intentionally not applied; adjust when formatting for display.

      The returned value is cached after the first call.

      Returns ZonedDateTime

      the Temporal.ZonedDateTime representing the moment of the molad

      import {Molad, months} from '@hebcal/core';
      const m = new Molad(5784, months.NISAN);
      const zdt = m.getInstant();
      console.log(zdt.toString()); // '2024-04-08T20:36:26.837+00:00[UTC]'

    • Returns number

      minutes past hour (0-59)

    • The exact Hebrew date of the molad, which often falls on the 28th or 30th of the preceeding month, occasionally on the first of the month, and in extremely rare circumstances the 27th of the month.

      • Molad Shevat 5541 occured on 27 Tevet / 1781-01-24T19:57:20.170Z
      • Molad Shevat 5788 will occur on 27 Tevet / 2028-01-26T19:07:03.504Z
      • Molad Nissan 5866 will occur on 27 Adar II / 2106-04-03T21:08:46.837Z

      Returns HDate

    • The month (1=NISSAN, 7=TISHREI) as constructed

      Returns number

    • Returns a transliterated string name of the molad's Hebrew month, for example 'Elul' or 'Cheshvan'.

      Returns string

    • Returns the latest time of Kiddush Levana calculated as 15 days after the molad. This is the opinion brought down in the Shulchan Aruch (Orach Chaim 426). It should be noted that some opinions hold that the Rema who brings down the opinion of the Maharil's of calculating half way between molad and molad is of the opinion that Mechaber agrees to his opinion. Also see the Aruch Hashulchan. For additional details on the subject, See Rabbi Dovid Heber's very detailed writeup in Siman Daled (chapter 4) of Shaarei Zmanim. This method returns the time even if it is during the day when Kiddush Levana can't be said. Callers of this method should consider displaying alos before this time if the zman is between alos and tzais.

      Returns ZonedDateTime

      the Temporal.ZonedDateTime representing the moment 15 days after the molad.

    • Returns the latest time of Kiddush Levana according to the Maharil's opinion that it is calculated as halfway between molad and molad. This adds half the 29 days, 12 hours and 793 chalakim time between molad and molad (14 days, 18 hours, 22 minutes and 666 milliseconds) to the month's molad. This method returns the time even if it is during the day when Kiddush Levana can't be said. Callers of this method should consider displaying alos before this time if the zman is between alos and tzais.

      Returns ZonedDateTime

      the Temporal.ZonedDateTime representing the moment halfway between molad and molad.

    • Returns the earliest time of Kiddush Levana calculated as 3 days after the molad. This method returns the time even if it is during the day when Kiddush Levana can't be said. Callers of this method should consider displaying the next tzais if the zman is between alos and tzais.

      Returns ZonedDateTime

      the Temporal.ZonedDateTime representing the moment 3 days after the molad.

    • Returns the earliest time of Kiddush Levana calculated as 7 days after the molad as mentioned by the Mechaber. See the Bach's opinion on this time. This method returns the time even if it is during the day when Kiddush Levana can't be said. Callers of this method should consider displaying the next tzais if the zman is between alos and tzais.

      Returns ZonedDateTime

      the Temporal.ZonedDateTime representing the moment 7 days after the molad.

    • The year of the molad (as constructed)

      Returns number

    • Returns a human-readable, localized string announcing the molad — suitable for use on Shabbat Mevarchim. The format includes the Hebrew month name, day of week, hour : minute, and chalakim if non-zero.

      Time format honors options.hour12 and options.location (12-hour vs. 24-hour); see reformatTimeStr.

      Parameters

      • Optionallocale: string

        Optional locale name (defaults to empty locale)

      • Optionaloptions: CalOptions

        used for time formatting (12-hour vs 24-hour)

      Returns string

      import {Molad, months} from '@hebcal/core';
      const m = new Molad(5784, months.NISAN);
      m.render('en', {hour12: true});
      // => 'Molad Nisan: Monday, 10:57pm and 7 chalakim'
      m.render('en', {hour12: false});
      // => 'Molad Nisan: Monday, 22:57 and 7 chalakim'
      m.render('he');
      // => 'מוֹלָד הָלְּבָנָה נִיסָן יִהְיֶה בַּיּוֹם שֵׁנִי בשָׁבוּעַ, …'

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