Package provides validation of PESEL (the national identification number used in Poland - https://en.wikipedia.org/wiki/PESEL) for Go. If argument PESEL number (passed in as a string) is valid, result struct provides access to birthdate and gender extracted from the number, while result error is nil. If number is invalid, non nil error is returned, while the result struct contains zero values.

This package is not providing information if given PESEL number exists. Package only validates if the number complies with basic rules described by legislation. Positive validation doesn't mean given number has been issued and assigned to any person. Negative validation means that the number theoretically could have not been issued, unless by mistake of authorities.

package main

import (
	"fmt"
	"os"

	"github.com/boolproof/pesel-go"
)

func main() {
	number := os.Args[1]

	pesel, err := pesel.NewPesel(number)
	if err != nil {
		fmt.Println(err.Error()) //outputs "invalid PESEL"
	} else {
		birthDateStr := fmt.Sprintf("%04d-%02d-%02d", pesel.BirthDate().Year, pesel.BirthDate().Month, pesel.BirthDate().Day)
		fmt.Printf("'%s' is a valid PESEL. Encoded birthdate: %s; encoded gender: %s\n", pesel.Number(), birthDateStr, pesel.Gender())
	}
}