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{{Wiktionary}}
{{Wiktionary}}
A '''half-birthday''' is a day approximately six months before or after the anniversary of a person's birth. (This is not to be confused with an [[Unbirthday]].) It is sometimes marked by people whose [[birthday]] falls near major holidays, the celebration of which may overshadow celebration of the birthday. It may also be marked by students whose birthday does not occur during the regular school year; a half-birthday allows a celebration with friends at school.
A '''half-birthday''' celebration, it is said, are only for little girls and a 22.5 year old male named Kory Iverson. It is a day approximately six months before or after the anniversary of a person's birth. (This is not to be confused with an [[Unbirthday]].) It is sometimes marked by people whose [[birthday]] falls near major holidays, the celebration of which may overshadow celebration of the birthday. It may also be marked by students whose birthday does not occur during the regular school year; a half-birthday allows a celebration with friends at school.


== Calculation ==
== Calculation ==

There are two ways to calculate half-birthdays.


# The easier but potentially less precise method is to take the number of the date of the birthday and advance the month by six, e.g. December 3 becomes June 3. However, because not all months have the same number of days, this doesn't always work – for example, six months after an August 30 birthday would be [[February 30]], which doesn't exist in the [[Gregorian calendar]].
# The easier but potentially less precise method is to take the number of the date of the birthday and advance the month by six, e.g. December 3 becomes June 3. However, because not all months have the same number of days, this doesn't always work – for example, six months after an August 30 birthday would be [[February 30]], which doesn't exist in the [[Gregorian calendar]].

Revision as of 18:37, 13 January 2014

A half-birthday celebration, it is said, are only for little girls and a 22.5 year old male named Kory Iverson. It is a day approximately six months before or after the anniversary of a person's birth. (This is not to be confused with an Unbirthday.) It is sometimes marked by people whose birthday falls near major holidays, the celebration of which may overshadow celebration of the birthday. It may also be marked by students whose birthday does not occur during the regular school year; a half-birthday allows a celebration with friends at school.

Calculation

  1. The easier but potentially less precise method is to take the number of the date of the birthday and advance the month by six, e.g. December 3 becomes June 3. However, because not all months have the same number of days, this doesn't always work – for example, six months after an August 30 birthday would be February 30, which doesn't exist in the Gregorian calendar.
  2. The more precise method is to add or subtract half the number of days in a year to the birth date. In the case of a common year, this would be 182.5 days. In leap years, the number of days would be 183. Continuing the example from the paragraph above, this method would lead to a March 1 or February 29 half-birthday for an August 30 birthday, depending on whether it's a leap year.[1]

At least three children's books have been written about half-birthdays:

  • Pomerantz, Charlotte (1984). The Half-Birthday Party. New York: Clarion Books. ISBN 0-89919-273-4.
  • Graham, Bob (2005). Oscar's Half Birthday. Cambridge: Candlewick Press. ISBN 0-7636-2699-6.
  • Martin, Ann (1996). Karen's Half Birthday. New York: Scholastic. ISBN 0-590-69186-4.

References