如何将波斯数字转英文数字及波斯历当前日期转数字用于计算

First, let’s tackle the core problem: when you fetch a Persian date with toLocaleDateString('fa-IR'), it returns Persian digits (۰۱۲۳۴۵۶۷۸۹) which can’t be directly used for numerical calculations. We need a reliable way to convert these to standard English numerals (0123456789).

Step 1: Build a Reusable Digit Conversion Helper #

This function will convert any Persian digits in a string to English ones by leveraging their consecutive Unicode values—no messy per-digit regex replacements needed:

function convertPersianDigitsToEnglish(inputString) {
  // Target all Persian digit characters (Unicode range U+06F0 to U+06F9)
  return inputString.replace(/[\u06F0-\u06F9]/g, persianChar => {
    // Adjust Unicode value to map to the corresponding English digit
    return String.fromCharCode(persianChar.charCodeAt(0) - 1728);
  });
}

Step 2: Update Your HTMLUI Prototype #

Let’s modify your existing displayYear method to retrieve the Persian year, convert it to English digits, and extend it to handle full date and current time conversion as needed:

function HTMLUI() {}

HTMLUI.prototype.displayYear = function() {
  // Get full Persian date string
  const persianDate = new Date().toLocaleDateString('fa-IR');
  
  // Extract and convert the year to English digits (ready for calculations)
  const persianYear = persianDate.slice(0, 4);
  const englishYear = convertPersianDigitsToEnglish(persianYear);
  
  console.log('Converted Shamsi Year (English digits):', englishYear);
  
  // Optional: Convert and log the full Persian date
  const englishFullDate = convertPersianDigitsToEnglish(persianDate);
  console.log('Full Converted Shamsi Date:', englishFullDate);
};

// Add a method to handle current time conversion in Persian locale
HTMLUI.prototype.displayCurrentTime = function() {
  const persianTime = new Date().toLocaleTimeString('fa-IR');
  const englishTime = convertPersianDigitsToEnglish(persianTime);
  console.log('Converted Current Time (English digits):', englishTime);
};

How It Works #

• The regex /[\u06F0-\u06F9]/g matches every Persian digit in the input string.
• Subtracting 1728 from the Unicode value of each Persian digit maps it directly to the corresponding English digit (e.g., ۰ → 0, ۱ → 1).
• Converted strings can be parsed to numbers with parseInt() or parseFloat() for calculations.

Example Usage #

const ui = new HTMLUI();
ui.displayYear();
// Sample output:
// Converted Shamsi Year (English digits): 1402
// Full Converted Shamsi Date: 1402/09/15

ui.displayCurrentTime();
// Sample output:
// Converted Current Time (English digits): 14:30:45

This approach ensures all Persian digits in your date/time strings are converted to usable English numerals for any arithmetic or numerical processing needs.

内容的提问来源于stack exchange，提问作者Mohammad Amiri