Formula date calculate

How to calculate date to date or date of birth?
Learn the formula.

How to manual date calculate?

Important: here is perfect formula of date calculate. nowadays, many websites and applications using this formula. today i explain some right formulas. let's start
suppose
today date = 25-11-2020 and birth date = 11-06 -2000 [ used formet: dd-mm-yy ]

today date = 25-11-2020

birth date = 11-06-2000

if have birth date smaller from today date so use simple minus method.

Note here today's date months and years larger from birth date month and year.
just like
      today date :   25 - 11 - 2020
      birth date : - 11 - 06 - 2000
Use minus method : ----------------
      your age =     14 - 05 - 0020
There are different rules for the other type of date.

if have today's month smaller than the birth month so use this method.

for example
date formats [dd-mm-yyyy]

today date = 23-06-2020

birth date = 19-11-2000

today month=06
birth month=11; formula Months = Total month of year - month of birth + month of today;
Days = today date-birth date;
for date Calculation
days= 23(today date)-19(birth date)

 days = 23-19 = 4 ;
 Total days = 4 ;
   

for the month Calculation md= 12(total month of year)-11(birth month); total month= md+(today month;)

  12-11 = 1 ;
  01+06 = 7 ;
  Total month = 7 ;

for year Calculation today year of date- birth date of month

  today date = 2020
  birth date = 2000 
  2020-2000 = 20 ;
  Total year = 20;
   

Note here today's months smaller from birth month.

Best way to count the year

Suppose

today date = 28-09-2020

birth date = 19-11-2000

age = today date-birth date ; Total Year= age/1000×24×60×60×365.25 script format
T.Y. = Math.floor(age/1000*24*60*60×365.25);

how to calculate total days of age ?

A best method for counting days !

date format [mm-dd-yyyy]
Suppose

Total year=23 ;

days counting formula = year/34560000; or days counting formula = year/(1000×24×24×60); Total days = 23/1000×24×24×60 ;
total days= 794;
script format
Total Days = Math.floor(Total Year/(1000*24*24*60));

click here to go my date calculate website Age calculator

If want learn all formula in full javascript for the date calculator so tell me in comment section.