code: def _days_from_3744(hebrew_year):
      
      # Start point for calculation is Molad new year 3744 (16BC)
      years_from_3744 = hebrew_year - 3744
      molad_3744 = get_chalakim(1 + 6, 779)    # Molad 3744 + 6 hours in parts
  
      # Time in months
  
      # Number of leap months
      leap_months = (years_from_3744 * 7 + 1) // 19
      leap_left = (years_from_3744 * 7 + 1) % 19    # Months left of leap cycle
      months = years_from_3744 * 12 + leap_months   # Total Number of months
  
      # Time in parts and days
      # Molad This year + Molad 3744 - corrections
      parts = months * PARTS_IN_MONTH + molad_3744
      # 28 days in month + corrections
      days = months * 28 + parts // PARTS_IN_DAY - 2
  
      # Time left for round date in corrections
      # 28 % 7 = 0 so only corrections counts
      parts_left_in_week = parts % PARTS_IN_WEEK
      parts_left_in_day = parts % PARTS_IN_DAY
      week_day = parts_left_in_week // PARTS_IN_DAY
  
      # pylint: disable=too-many-boolean-expressions
      # pylint-comment: Splitting the 'if' below might create a bug in case
      # the order is not kept.
  
      # Molad ד"ר ט"ג
      if ((leap_left < 12 and week_day == 3 and
           parts_left_in_day >= get_chalakim(9 + 6, 204)) or
              # Molad ט"פקת ו"טב
              (leap_left < 7 and week_day == 2 and
               parts_left_in_day >= get_chalakim(15 + 6, 589))):
          days += 1
          week_day += 1
  
      # pylint: enable=too-many-boolean-expressions
  
      # ADU
      if week_day in (1, 4, 6):
          days += 1
  
      return days
docs: Return: Number of days since 3,1,3744.