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    Function subMinutes

    • Subtract the specified number of minutes from the given date.

      This function validates arguments before processing and returns a new Date instance with the specified number of minutes subtracted. Fractional minutes are truncated toward zero. Preserves seconds and milliseconds.

      Parameters

      • date: number | Date

        The base date as a Date object or timestamp (number)

      • amount: number

        The number of minutes to subtract (can be negative to add)

      Returns Date

      A new Date object with the minutes subtracted, or Invalid Date if any input is invalid

      // Subtract positive minutes
      const result = subMinutes(new Date(2020, 0, 1, 12, 30, 0), 15);
      // Returns: 2020-01-01T12:15:00

      // Add minutes (negative amount)
      const result = subMinutes(new Date(2020, 0, 1, 12, 30, 0), -15);
      // Returns: 2020-01-01T12:45:00

      // Fractional amounts are truncated
      const result = subMinutes(new Date(2020, 0, 1, 12, 30, 0), 1.9);
      // Returns: 2020-01-01T12:29:00 (1.9 truncated to 1)

      // Crossing hour boundary
      const result = subMinutes(new Date(2020, 0, 1, 12, 15, 0), 30);
      // Returns: 2020-01-01T11:45:00

      // Invalid inputs return Invalid Date
      const result = subMinutes(new Date("invalid"), 30);
      // Returns: Invalid Date
      • Validates arguments before conversion (consistent with library patterns)
      • Accepts both Date objects and numeric timestamps
      • Fractions are truncated using Math.trunc (1.9 → 1, -1.9 → -1)
      • Preserves seconds and milliseconds
      • Returns Invalid Date for: Invalid Date, NaN, Infinity, -Infinity
      • Always returns a new Date instance (does not mutate input)

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