Calculators

Simple Birthdate-to-Age-at-Given-Or-Current-Date Conversion function

Type:	code fragment
Added by:	yaragn1
Entered:	15/07/2001
Last modified:	07/12/2000
Rating:	- (fewer than 3 votes)
Views:	7096

Simple Birthdate-Age function. Given three parameters (month, day, year), it will return a correct age as an integer, doesn't rely on Timestamp.

You can give it another three parameters as the date to compare it to, i.e. it will return the age at a given date. Presumes current date.

For sanity if given two-digit years presumes date was in 20th century. Hope you find it useful. Not exactly rocket science.

<?php
function getAgeByDate ($iMonth, $iDay, $iYear, $nMonth=0, $nDay=0, $nYear=0) { 

                                // simple mm/dd/yy(yy) to age conversion.

                                // Copyright (C)2001 Servability Ltd. Beerware!!

                                If (!$nMonth) $nMonth = date("m");

                                If (!$nDay) $nDay = date("d");

                                If (!$nYear) $nYear = date("Y");

                                If ($iYear < 100) {

                                    $iYear = 1900 + $iYear;

                                }

                                $baseyear = $nYear - $iYear - 1;

                                If ($iMonth < $nMonth OR ($iMonth == $nMonth AND $iDay <= $nDay)) {

                                    // had birthday

                                    $baseyear++;

                                }

                                        

                                return $baseyear; 

                            }
?>

Usage Example

print getAgeByDate(5,26,1979) . " now <br>";

                            print getAgeByDate(5,26,79,2,5,2020) . " on 2nd May 2020<br>";

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