fix(patient): error in age calculation

healthcare/healthcare/doctype/patient/patient.js

@@ -104,11 +104,10 @@ let create_medical_record = function (frm) {
 };
 
 let get_age = function (birth) {
- let ageMS = Date.parse(Date()) - Date.parse(birth);
- let age = new Date();
- age.setTime(ageMS);
- let years = age.getFullYear() - 1970;
- return `${years} ${__('Year(s)')} ${age.getMonth()} ${__('Month(s)')} ${age.getDate()} ${__('Day(s)')}`
+ let birth_moment = moment(birth);
+ let current_moment = moment(Date());
+ let diff = moment.duration(current_moment.diff(birth_moment));
+ return `${diff.years()} ${__('Year(s)')} ${diff.months()} ${__('Month(s)')} ${diff.days()} ${__('Day(s)')}`
 };
 
 let create_vital_signs = function (frm) {