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    Function isSameDay

    • Check if two dates are on the same calendar day.

      This function compares two dates and returns true if they fall on the same calendar day, regardless of time components.

      Parameters

      • dateLeft: number | Date

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

      • dateRight: number | Date

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

      Returns boolean

      True if both dates are on the same day, false otherwise or if either date is invalid

      // Same day, different times
      const result = isSameDay(
        new Date(2024, 5, 15, 0, 0),
        new Date(2024, 5, 15, 23, 59)
      );
      // Returns: true

      // Different days
      const result2 = isSameDay(
        new Date(2024, 5, 15, 23, 59),
        new Date(2024, 5, 16, 0, 0)
      );
      // Returns: false

      // Same day, different times (with seconds)
      const result3 = isSameDay(
        new Date(2024, 5, 15, 14, 30, 45),
        new Date(2024, 5, 15, 9, 15, 20)
      );
      // Returns: true

      // Works with timestamps
      const today = new Date(2024, 5, 15);
      const result4 = isSameDay(today.getTime(), today);
      // Returns: true

      // Invalid dates return false
      const result5 = isSameDay(new Date("invalid"), new Date(2024, 5, 15));
      // Returns: false
      • Validates arguments before processing (consistent with library patterns)
      • Returns false for any invalid input (Invalid Date, NaN, Infinity, -Infinity)
      • Accepts both Date objects and numeric timestamps
      • Ignores hour, minute, second, and millisecond components in the comparison
      • Compares based on local timezone calendar day
      • Uses diffDays internally to determine if the day difference is zero
      • Handles DST transitions and leap years correctly

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