Need to Calculate difference between 2 dates in YEAR , MONTH & DAYS

I need the difference between 2 dates  in three different field:

In first field :  it should in Years

   2nd Field :  it should be Month,

  3rd Field :  it should be Days

For ex-  First Date: 14/05/1998   second date: 18/04/2019 

difference should show   1st Field:   20 years 

                                        2nd Field : 11 months

                                      3rd Field :   04 days

I searched regarding this on this community and found few scripts, accordingly i converted the full difference in milliseconds.. and converted them to days, months, year.. everything works fine

but days are not calculated correctly due to 30,31, 28,29 days and in month due leap year.

Below are the scripts used after the difference is converted to milliseconds (TotalTime_MS)

for day field:

event.value = Math.floor((this.getField("TotalTime_MS").value)/(1000*60*60*24)%365.25);

For Month Field:

event.value = Math.floor( ((this.getField("TotalTime_MS").value)/(1000*60*60*24*30))%12 );

For Year Field:

event.value = Math.floor((this.getField("TotalTime_MS").value)/(1000*60*60*24*365.25));

Thanks in advance