ID Card Birthday Extractor
Extract birthday information from Chinese ID card numbers. Quickly parse date of birth, age, zodiac sign, and constellation from 15 or 18-digit ID numbers with validation.
ID Card Birthday Extractor Tool Introduction
A powerful ID card birthday extractor that instantly extracts date of birth and related information from Chinese ID card numbers. Simply enter a 15-digit or 18-digit ID number to get the birthday, current age, Chinese zodiac sign, and Western constellation.
Perfect for HR professionals, administrative staff, customer service representatives, data analysts, and anyone who needs to quickly extract birthday information from ID numbers. The tool validates ID card format and provides comprehensive birth date analysis.
Our extractor supports both old 15-digit and new 18-digit Chinese ID card formats, automatically validates the check digit for 18-digit IDs, and provides detailed birthday information including year, month, day, age calculation, zodiac sign, and astrological constellation.
All processing is done locally in your browser for privacy and security. No ID card information is transmitted or stored on any server, ensuring complete confidentiality of personal data.
ID Card Birthday Extractor User Guide
Getting Started
Using the ID Card Birthday Extractor is simple and secure:
Basic Usage
- Enter ID Number: Type or paste a 15 or 18-digit Chinese ID card number
- Automatic Extraction: Birthday information is extracted instantly
- View Results: See date of birth, age, zodiac sign, and constellation
- Validation: The tool validates ID format and check digit
- Privacy Protected: All processing happens locally in your browser
Understanding Chinese ID Card Numbers
18-Digit ID Card Format
The modern 18-digit Chinese ID card number structure:
- Digits 1-6: Administrative division code (province, city, district)
- Digits 7-14: Date of birth (YYYYMMDD format)
- Digits 15-17: Sequence code (odd for male, even for female)
- Digit 18: Check digit (0-9 or X)
15-Digit ID Card Format (Legacy)
The older 15-digit format structure:
- Digits 1-6: Administrative division code
- Digits 7-12: Date of birth (YYMMDD format, assumes 19XX)
- Digits 13-15: Sequence code
Extracted Information
Birthday Details
- Full Date: Complete date of birth (YYYY-MM-DD)
- Year: Birth year
- Month: Birth month
- Day: Birth day
- Current Age: Calculated age based on current date
Zodiac Information
- Chinese Zodiac: One of 12 animals (Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig)
- Western Constellation: Astrological sign based on birth date (Aries, Taurus, Gemini, etc.)
Common Use Cases
Business Applications
- HR Management: Extract employee birth dates for records
- Customer Service: Verify customer age and birthday information
- Data Entry: Quickly populate birthday fields from ID numbers
- Age Verification: Confirm age requirements for services
Administrative Tasks
- Registration Forms: Auto-fill birthday from ID number
- Document Processing: Extract birth information from ID scans
- Database Management: Batch process ID numbers for birthday data
- Compliance Checks: Verify age-related requirements
Validation Features
Format Validation
- Checks for correct length (15 or 18 digits)
- Validates numeric format (except last digit can be X)
- Verifies administrative division code structure
- Validates date format and logical date values
Check Digit Validation (18-digit IDs)
The 18th digit is calculated using a specific algorithm:
- Each of the first 17 digits is multiplied by a weight factor
- The sum is divided by 11 to get a remainder
- The remainder maps to the check digit (0-9 or X)
- This validates the ID number authenticity
Privacy & Security
Local Processing
- No Server Upload: All extraction happens in your browser
- No Data Storage: ID numbers are not saved or logged
- No Tracking: No analytics or tracking of ID information
- Complete Privacy: Your data never leaves your device
Best Practices
- Only use this tool for legitimate purposes
- Respect privacy laws and regulations
- Don't share extracted information without consent
- Clear the input field after use on shared computers
Key Features
- Dual Format Support: Works with both 15 and 18-digit IDs
- Instant Extraction: Real-time birthday information display
- Comprehensive Validation: Format and check digit verification
- Age Calculation: Automatic current age computation
- Zodiac Signs: Both Chinese and Western astrology
- Privacy First: Local processing, no data transmission
- User Friendly: Simple interface, clear results
- Mobile Compatible: Works on all devices
Tips & Tricks
- The tool automatically detects whether the ID is 15 or 18 digits
- For 15-digit IDs, the year assumes 19XX (1900-1999)
- The check digit X in 18-digit IDs represents the value 10
- Invalid dates (like February 30) will be flagged as errors
- Age is calculated based on your current system date
- Use this tool to verify ID authenticity through check digit validation
Frequently Asked Questions
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