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define_tag('age', -description='Returns age in years. By default the current date is used to determine age, but can be overridden by passing in a second date.',
-namespace='date_',
-required='dob', -type='date',
-optional='end', -type='date',
-priority='replace');
!local_defined('end') ? local('end') = date;
local('age') = #end->year - #dob->year - 1;
if((#end->month - #dob->month == 0 && #end->day - #dob->day >= 0)
|| #end->month - #dob->month > 0);
#age+=1;
/if;
return(#age);
/define_tag;
