JavaScript中如何逆向转换Date.toLocaleString生成的本地化字符串？

Absolutely, you can do this without external libraries—you just need to manually parse the specific format of your locale string since the built-in Date methods don’t handle inconsistent locale formats well.

Here’s why your initial attempts failed: new Date(x) and Date.parse(x) rely on standardized date formats (like ISO 8601), but locale strings vary widely based on browser and region settings. Your example string "20.05.2018, 10:21:37" uses a DD.MM.YYYY, HH:mm:ss format, which isn’t recognized by the default parsers.

Step-by-Step Implementation: #

You can break down the string into its components and build a new Date object manually:

function localeStringToDate(localeStr) {
  // Split date and time sections
  const [datePart, timePart] = localeStr.split(', ');
  
  // Extract day, month, year from the date segment
  const [day, month, year] = datePart.split('.').map(Number);
  
  // Extract hours, minutes, seconds from the time segment
  const [hours, minutes, seconds] = timePart.split(':').map(Number);
  
  // Create Date object (note: JavaScript months are 0-indexed)
  return new Date(year, month - 1, day, hours, minutes, seconds);
}

// Test with your example
const x = "20.05.2018, 10:21:37";
const dateObj = localeStringToDate(x);
console.log(dateObj); // Outputs: Mon May 20 2018 10:21:37 GMT+... (matches your local timezone)
console.log(dateObj.toLocaleString()); // Should match your original input string

Key Notes: #

• This function is tailored to your specific locale format (DD.MM.YYYY, HH:mm:ss). If your locale uses a different structure (like MM/DD/YYYY or YYYY-MM-DD), adjust the order of components when creating the Date object.
• For robustness, you could add input validation checks (e.g., ensuring the string splits into the correct number of parts, verifying numeric values are valid) to avoid unexpected errors.

内容的提问来源于stack exchange，提问作者Daniel