<?php
$_GET['birthdate'] = "2015-02-07";
echo "INSERT INTO tabela (birthday) VALUES ($date)";
//https://pt.stackoverflow.com/q/49854/101
PD9waHAKJF9HRVRbJ2JpcnRoZGF0ZSddID0gIjIwMTUtMDItMDciOwokZGF0ZSA9IGRhdGUoIlktbS1kIiwgc3RydG90aW1lKCRfR0VUWydiaXJ0aGRhdGUnXSkpOwplY2hvICJJTlNFUlQgSU5UTyB0YWJlbGEgKGJpcnRoZGF5KSBWQUxVRVMgKCRkYXRlKSI7CgovL2h0dHBzOi8vcHQuc3RhY2tvdmVyZmxvdy5jb20vcS80OTg1NC8xMDE=