Date Regex JavaScript Validator

Easily test and validate date formats like DD/MM/YYYY, MM-DD-YYYY, or ISO 8601 timestamps using advanced regex patterns. Perfect for building forms, parsing logs, or cleaning data in JavaScript applications.

Date Validator

Enter Date String

Date Format Auto-Detect Format DD/MM/YYYY (15/03/2024) MM/DD/YYYY (03/15/2024) YYYY-MM-DD (2024-03-15) DD-MM-YYYY (15-03-2024) MM-DD-YYYY (03-15-2024) YYYY/MM/DD (2024/03/15) ISO 8601 (2024-03-15T10:30:00Z) Custom Regex Pattern

Custom Regex Pattern

Validation Result

Enter a date string above to see validation results

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Common Date Regex Patterns

DD/MM/YYYY

^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/\d{4}$

Example: 15/03/2024

MM/DD/YYYY

^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/\d{4}$

Example: 03/15/2024

YYYY-MM-DD

^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$

Example: 2024-03-15

ISO 8601

^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d{3})?Z?$

Example: 2024-03-15T10:30:00Z

Complete Guide to Date Regex Validation

What is a Date Regex?

A Date Regex (Regular Expression) is a pattern-matching tool used to validate and extract date information from strings. It defines a specific format that a date string must follow to be considered valid. Date regex patterns are essential for:

• Form validation in web applications
• Data parsing and cleaning
• Log file analysis
• API input validation
• Database data integrity

JavaScript Regex Pattern for Date Validation

JavaScript provides powerful regex capabilities for date validation. Here are some common patterns:

• ^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/\d{4}$ - DD/MM/YYYY format
• ^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/\d{4}$ - MM/DD/YYYY format
• ^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$ - YYYY-MM-DD format

How to Validate a Date Using Regex in JavaScript

Here's a comprehensive example of date validation using regex:

function validateDate(dateString, format) {
  const patterns = {
    'dd/mm/yyyy': /^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/\d{4}$/,
    'mm/dd/yyyy': /^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/\d{4}$/,
    'yyyy-mm-dd': /^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/
  };
  return patterns[format].test(dateString);
}

How to Check if a String is a Valid Date in JavaScript

Beyond regex validation, you should also verify if the date is logically valid:

function isValidDate(dateString) {
  // First check regex pattern
  if (!validateDate(dateString, 'yyyy-mm-dd')) return false;
  
  // Then check if date is logically valid
  const date = new Date(dateString);
  return date instanceof Date && !isNaN(date);
}

Swapping Day and Year Positions in Date Strings

Sometimes you need to convert between different date formats. Here's how to swap positions:

function swapDateFormat(dateString, fromFormat, toFormat) {
  const match = dateString.match(/(\d{1,4})[\/-](\d{1,2})[\/-](\d{1,4})/);
  if (!match) return null;
  
  const [, part1, part2, part3] = match;
  if (toFormat === 'yyyy-mm-dd') {
    return `${part3}-${part2.padStart(2, '0')}-${part1.padStart(2, '0')}`;
  }
  return dateString;
}

Convert a Date to DD/MM/YYYY Format in JavaScript

Here are multiple ways to format dates:

function formatDate(date, format = 'dd/mm/yyyy') {
  const d = new Date(date);
  const day = String(d.getDate()).padStart(2, '0');
  const month = String(d.getMonth() + 1).padStart(2, '0');
  const year = d.getFullYear();
  
  switch(format) {
    case 'dd/mm/yyyy': return `${day}/${month}/${year}`;
    case 'mm/dd/yyyy': return `${month}/${day}/${year}`;
    case 'yyyy-mm-dd': return `${year}-${month}-${day}`;
    default: return `${day}/${month}/${year}`;
  }
}

Advanced Date Validation Techniques

For robust date validation, consider these additional checks:

• Leap Year Validation: February 29th only valid in leap years
• Month Length Validation: Different months have different maximum days
• Business Logic: Future date restrictions, age limits, etc.
• Timezone Handling: UTC vs local time considerations
• Locale-Specific Formats: Different countries use different formats

Best Practices

• Always combine regex validation with logical date validation
• Consider using libraries like Moment.js or date-fns for complex operations
• Test your regex patterns thoroughly with edge cases
• Provide clear error messages to users
• Consider internationalization requirements

Feature	Details
Price	Free
Rendering	Client-Side Rendering
Language	JavaScript
Paywall	No

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About This Tool

How It Works?

Date Regex Validator & Generator

Professional-grade tool for validating, generating, and testing date regular expressions with AI-powered suggestions and comprehensive analytics.

Date Validation

Date String to Validate

Regex Pattern DD/MM/YYYY (15/01/2024) MM/DD/YYYY (01/15/2024) YYYY-MM-DD (2024-01-15) DD-MM-YYYY (15-01-2024) MM-DD-YYYY (01-15-2024) ISO 8601 (2024-01-15T10:30:00Z) Custom Pattern

Options

Strict Mode (Validate actual date values) Allow Leading Zeros

Validation Results

Enter a date string to see validation results

Pattern Breakdown

Select a pattern to see its breakdown

Match Groups

No matches yet

Format Conversion

AI-Powered Regex Generator

Describe Your Date Format

Sample Dates (one per line)

Advanced Options

Include date value validation Case insensitive matching Make some components optional

Generated Patterns

Click "Generate Regex Pattern" to see AI-generated suggestions

Pattern Library

Batch Date Validation

Date Strings (one per line)

Validation Pattern Auto-detect format DD/MM/YYYY MM/DD/YYYY YYYY-MM-DD Mixed formats

Batch Results

No batch results yet

0

Valid Dates

0

Invalid Dates

Visual Regex Builder

Date Components

Day: D (1-31) DD (01-31) Flexible (1-31 or 01-31)

Month: M (1-12) MM (01-12) MMM (Jan-Dec) MMMM (January-December) Flexible (1-12 or 01-12)

Year: YY (24) YYYY (2024)

Order: Day/Month/Year Month/Day/Year Year/Month/Day

Separator: / - . Space Flexible (/, -, .)

Advanced Options

Include time (HH:MM:SS) Include timezone Make time optional

Generated Pattern

Configure components to generate pattern

Pattern Visualization

Pattern breakdown will appear here

Test Examples

Performance Testing

Test Pattern

Test Data Size 100 dates 1,000 dates 10,000 dates 100,000 dates

Test Types

Valid dates Invalid dates Edge cases

Performance Metrics

Execution Time: - ms

Matches/Second: -

Memory Usage: - MB

Accuracy: -%

Performance Chart

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Total Validations

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Success Rate

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Patterns Used

Validation Results

Most Used Patterns

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What is a Date Regex?

A Date Regex (Regular Expression) is a powerful pattern-matching tool used to validate, extract, and manipulate date strings in various formats. It provides a way to ensure that date inputs conform to specific patterns and formats before processing them in your applications.

Common Date Formats:

• DD/MM/YYYY: 15/01/2024 (European format)
• MM/DD/YYYY: 01/15/2024 (American format)
• YYYY-MM-DD: 2024-01-15 (ISO 8601 format)
• DD-MM-YYYY: 15-01-2024 (Alternative European)

JavaScript Regex Pattern for Date Validation

Here are some essential JavaScript regex patterns for date validation:

DD/MM/YYYY Pattern

/^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/([12]\d{3})$/

Matches dates like: 15/01/2024, 31/12/2023

YYYY-MM-DD Pattern (ISO 8601)

/^([12]\d{3})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/

Matches dates like: 2024-01-15, 2023-12-31

How to Validate a Date Using Regex in JavaScript

Basic Validation Function

function validateDate(dateString, format = 'dd/mm/yyyy') {
    const patterns = {
        'dd/mm/yyyy': /^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/([12]\d{3})$/,
        'mm/dd/yyyy': /^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/([12]\d{3})$/,
        'yyyy-mm-dd': /^([12]\d{3})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/
    };
    
    return patterns[format] ? patterns[format].test(dateString) : false;
}

// Usage examples
console.log(validateDate('15/01/2024', 'dd/mm/yyyy')); // true
console.log(validateDate('2024-01-15', 'yyyy-mm-dd')); // true

How to Check if a String is a Valid Date in JavaScript

Beyond regex pattern matching, you should also validate that the date actually exists (e.g., February 30th is invalid):

function isValidDate(dateString, format = 'dd/mm/yyyy') {
    // First check regex pattern
    if (!validateDate(dateString, format)) {
        return false;
    }
    
    // Parse the date components
    let day, month, year;
    
    if (format === 'dd/mm/yyyy') {
        [day, month, year] = dateString.split('/').map(Number);
    } else if (format === 'mm/dd/yyyy') {
        [month, day, year] = dateString.split('/').map(Number);
    } else if (format === 'yyyy-mm-dd') {
        [year, month, day] = dateString.split('-').map(Number);
    }
    
    // Create date object and verify
    const date = new Date(year, month - 1, day);
    return date.getFullYear() === year && 
           date.getMonth() === month - 1 && 
           date.getDate() === day;
}

Format Conversion Examples

Convert Date Formats

function convertDateFormat(dateString, fromFormat, toFormat) {
    // Extract date components based on source format
    let day, month, year;
    
    switch(fromFormat) {
        case 'dd/mm/yyyy':
            [day, month, year] = dateString.split('/');
            break;
        case 'mm/dd/yyyy':
            [month, day, year] = dateString.split('/');
            break;
        case 'yyyy-mm-dd':
            [year, month, day] = dateString.split('-');
            break;
    }
    
    // Format according to target format
    switch(toFormat) {
        case 'dd/mm/yyyy':
            return `${day}/${month}/${year}`;
        case 'mm/dd/yyyy':
            return `${month}/${day}/${year}`;
        case 'yyyy-mm-dd':
            return `${year}-${month}-${day}`;
    }
}