Question

I am working on task in which dates are involved. I have a person’s age in months+days. Now I want to get a date when this person reach to a specific age in months.

For example:

A person is 250 months and 15 days old on 2010-1-25.
On which date this person will become 300 months old? 

Function Signature may be:

function getReqDate( $startDate, $currAgeMonths, $currAgeDays, $reqAgeMonths  ) {
      //return date
}

Answer 1

Since you calculate the current age from the birthdate, I suggest you also use the birthdate instead of the current age to calculate when a user gets 300 months old. The following is the equivalent of the DateTime solution given above (does not require 5.3):

echo date('r', strtotime('+300 months', strtotime('1990-10-13')));

With the second param being the birthdate timestamp the above would give

Tue, 13 Oct 2015 00:00:00 +0200

Further reading:

• https://www.php.net/manual/en/function.strtotime.php
• http://www.rafaeldohms.com.br/2006/09/15/strtotime-is-it-useful/en/