The year here is 365/366 days and the month here is 28/29/30/31 days, that means your birthday may not mean you will be 0 days old.
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Advance age calculator works upon the algorithm of subtracting your provided data from current time, date, month, year. It is easy and safe to use this tool as it is developed by trusted "The Kingdom Of Knowledge" blog which is famous for providing information related to all legal stuff in hindi.
I don't do any kind of marketing of your given data. I can't even store that because there is no backup for exact age calculator. When you leave this page, the site automatically deletes all your input data. However you can still see your input data because of the cookies present in your browser. Try clearing your browser cookies if you see your input data again when entering this page.