Check for under age

jrm02t () — Tue, 28 Nov 2006 07:00:07 GMT

This function can be used to check if a user is underage.

Note: This is using rails core extensions. It'd need to be modified a bit for a pure ruby implementation.



def underage?(birthday)

  18.years.ago < birthday

end

Calculate age in C#

Edgardo (Edgardo Rossetto) — Sat, 04 Mar 2006 07:04:01 GMT

using System;
using System.Data;



public static class Snippets

{

    public static int CalculateAge(DateTime birthdate)

    {

        // get the difference in years

        int years = DateTime.Now.Year - birthdate.Year;

        // subtract another year if we're before the

        // birth day in the current year

        if (DateTime.Now.Month < birthdate.Month || (DateTime.Now.Month == birthdate.Month && DateTime.Now.Day < birthdate.Day))

            years--;



        return years;

    }

}

Calculate Age

mjlintz () — Sat, 28 Jan 2006 23:32:45 GMT

With this function you can calculate the age of a person

Example:
echo "Age is: " . birthday ("1984-07-05");

Result will be (23 Feb 2005) = "Age is: 20"





  //calculate years of age (input string: YYYY-MM-DD)

  function birthday ($birthday){

    list($year,$month,$day) = explode("-",$birthday);

    $year_diff  = date("Y") - $year;

    $month_diff = date("m") - $month;

    $day_diff   = date("d") - $day;

    if ($day_diff < 0 || $month_diff < 0)

      $year_diff--;

    return $year_diff;

  }



?>

How Old

Will_Rickards (Will Rickards) — Fri, 02 Sep 2005 00:06:01 GMT

Javascript function to determine how old someone is.



// ---------------------------------------------------------------------------|

// qryHowOld                                                                  |

// Description: How old someone is in the format:                             |

// XXX Years XX Months X Weeks X Days                                         |

// Birth Date could be specified like Date.UTC(2002,8,16,17,42,0)             |

//                                                                            |

// Arguments:                                                                 |

//    varAsOfDate: as of date                                                 |

//    varBirthDate: birth date                                                |

//                                                                            |

function qryHowOld(varAsOfDate, varBirthDate)

   {

   var dtAsOfDate;

   var dtBirth;

   var dtAnniversary;

   var intSpan;

   var intYears;

   var intMonths;

   var intWeeks;

   var intDays;

   var intHours;

   var intMinutes;

   var intSeconds;

   var strHowOld;



   // get born date

   dtBirth = new Date(varBirthDate);

   

   // get as of date

   dtAsOfDate = new Date(varAsOfDate);



   // if as of date is on or after born date

   if ( dtAsOfDate >= dtBirth )

      {



      // get time span between as of time and birth time

      intSpan = ( dtAsOfDate.getUTCHours() * 3600000 +

                  dtAsOfDate.getUTCMinutes() * 60000 +

                  dtAsOfDate.getUTCSeconds() * 1000    ) -

                ( dtBirth.getUTCHours() * 3600000 +

                  dtBirth.getUTCMinutes() * 60000 +

                  dtBirth.getUTCSeconds() * 1000       )



      // start at as of date and look backwards for anniversary 



      // if as of day (date) is after birth day (date) or

      //    as of day (date) is birth day (date) and

      //    as of time is on or after birth time

      if ( dtAsOfDate.getUTCDate() > dtBirth.getUTCDate() ||

           ( dtAsOfDate.getUTCDate() == dtBirth.getUTCDate() && intSpan >= 0 ) )

         {



         // most recent day (date) anniversary is in as of month

         dtAnniversary = 

            new Date( Date.UTC( dtAsOfDate.getUTCFullYear(),

                                dtAsOfDate.getUTCMonth(),

                                dtBirth.getUTCDate(),

                                dtBirth.getUTCHours(),

                                dtBirth.getUTCMinutes(),

                                dtBirth.getUTCSeconds() ) );



         }



      // if as of day (date) is before birth day (date) or

      //    as of day (date) is birth day (date) and

      //    as of time is before birth time

      else

         {



         // most recent day (date) anniversary is in month before as of month

         dtAnniversary = 

            new Date( Date.UTC( dtAsOfDate.getUTCFullYear(),

                                dtAsOfDate.getUTCMonth() - 1,

                                dtBirth.getUTCDate(),

                                dtBirth.getUTCHours(),

                                dtBirth.getUTCMinutes(),

                                dtBirth.getUTCSeconds() ) );



         // get previous month

         intMonths = dtAsOfDate.getUTCMonth() - 1;

         if ( intMonths == -1 )

            intMonths = 11;



         // while month is not what it is supposed to be (it will be higher)

         while ( dtAnniversary.getUTCMonth() != intMonths )



            // move back one day

            dtAnniversary.setUTCDate( dtAnniversary.getUTCDate() - 1 );



         }



      // if anniversary month is on or after birth month

      if ( dtAnniversary.getUTCMonth() >= dtBirth.getUTCMonth() )

         {



         // months elapsed is anniversary month - birth month

         intMonths = dtAnniversary.getUTCMonth() - dtBirth.getUTCMonth();



         // years elapsed is anniversary year - birth year

         intYears = dtAnniversary.getUTCFullYear() - dtBirth.getUTCFullYear();



         }



      // if birth month is after anniversary month

      else

         {



         // months elapsed is months left in birth year + anniversary month

         intMonths = (11 - dtBirth.getUTCMonth()) + dtAnniversary.getUTCMonth() + 1;



         // years elapsed is year before anniversary year - birth year

         intYears = (dtAnniversary.getUTCFullYear() - 1) - dtBirth.getUTCFullYear();



         }



      // to calculate weeks, days, hours, minutes and seconds

      // we can take the difference from anniversary date and as of date



      // get time span between two dates in milliseconds

      intSpan = dtAsOfDate - dtAnniversary;



      // get number of weeks

      intWeeks = Math.floor(intSpan / 604800000);



      // subtract weeks from time span

      intSpan = intSpan - (intWeeks * 604800000);

      

      // get number of days

      intDays = Math.floor(intSpan / 86400000);



      // subtract days from time span

      intSpan = intSpan - (intDays * 86400000);



      // get number of hours

      intHours = Math.floor(intSpan / 3600000);

    

      // subtract hours from time span

      intSpan = intSpan - (intHours * 3600000);



      // get number of minutes

      intMinutes = Math.floor(intSpan / 60000);



      // subtract minutes from time span

      intSpan = intSpan - (intMinutes * 60000);



      // get number of seconds

      intSeconds = Math.floor(intSpan / 1000);



      // create output string     

      if ( intYears > 0 )

         if ( intYears > 1 )

            strHowOld = intYears.toString() + ' Years';

         else

            strHowOld = intYears.toString() + ' Year';

      else

         strHowOld = '';



      if ( intMonths > 0 )

         if ( intMonths > 1 )

            strHowOld = strHowOld + ' ' + intMonths.toString() + ' Months';

         else

            strHowOld = strHowOld + ' ' + intMonths.toString() + ' Month';

           

      if ( intWeeks > 0 )

         if ( intWeeks > 1 )

            strHowOld = strHowOld + ' ' + intWeeks.toString() + ' Weeks';

         else

            strHowOld = strHowOld + ' ' + intWeeks.toString() + ' Week';



      if ( intDays > 0 )

         if ( intDays > 1 )

            strHowOld = strHowOld + ' ' + intDays.toString() + ' Days';

         else

            strHowOld = strHowOld + ' ' + intDays.toString() + ' Day';



      if ( intHours > 0 )

         if ( intHours > 1 )

            strHowOld = strHowOld + ' ' + intHours.toString() + ' Hours';

         else

            strHowOld = strHowOld + ' ' + intHours.toString() + ' Hour';

 

      if ( intMinutes > 0 )

         if ( intMinutes > 1 )

            strHowOld = strHowOld + ' ' + intMinutes.toString() + ' Minutes';

         else

            strHowOld = strHowOld + ' ' + intMinutes.toString() + ' Minute';



      if ( intSeconds > 0 )

         if ( intSeconds > 1 )

            strHowOld = strHowOld + ' ' + intSeconds.toString() + ' Seconds';

         else

            strHowOld = strHowOld + ' ' + intSeconds.toString() + ' Second';



      }

   else

      strHowOld = 'Not Born Yet'



   // return string representation

   return strHowOld

   }   

//                                                                            |

// qryHowOld                                                                  |

// ---------------------------------------------------------------------------|

DZone Snippets: age code

Check for under age

Calculate age in C#

Calculate Age

How Old