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birth date
A birthday is the anniversary of the birth of a person, or figuratively of an institution. Birthdays of people are celebrated in numerous cultures, often with birthday gifts, birthday cards, a birthday party, or a rite of passage.
Many religions celebrate the birth of their founders or religious figures with special holidays (e.g. Christmas, Mawlid, Buddha's Birthday, and Krishna Janmashtami).
There is a distinction between birthday and birthdate (also known as date of birth): the former, except for February 29, occurs each year (e.g. January 15), while the latter is the complete date when a person was born (e.g. January 15, 2001).
Given 2 dates.
Date Start and Date End
or
Date From and Date To
Write function or code (PHP or Javascript or C# or C++ or Java or Visual Basic or MySQL) that calculates birth age, expiration age, expiration date, notification date before expiration date or birth date.
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