ISO 8601 DateTime Regex Pattern

Live Regex Tester

Pattern Breakdown

Code Examples

const regex = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:\d{2})?$/;
const test = "2026-03-07T14:30:00Z";
console.log(regex.test(test)); // true

// Extract matches
const matches = test.match(regex);
console.log(matches);

import re

pattern = r'^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:\d{2})?$'
test = "2026-03-07T14:30:00Z"
match = re.search(pattern, test)
print(match)  # Found!

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:\d{2})?$`)
    fmt.Println(re.MatchString("2026-03-07T14:30:00Z")) // true
}

Common Use Cases

Match Examples

About the ISO 8601 DateTime Regex

Validates full ISO 8601 datetime strings with optional milliseconds and timezone offset (Z or +/-HH:MM).

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The iso 8601 datetime pattern is classified as advanced difficulty in the date & time category. It works in all major programming languages.

When using this regex, always consider edge cases and test thoroughly with real-world data. Use the interactive tester above to validate the pattern against your specific inputs before deploying to production.

More Date & Time Patterns