CFLib.org – Common Function Library Project

Description:
DaysTilBirthday returns the number of days until your next birthday. It should accept any date ColdFusion can parse, and will return an integer. If your birthday happens to be today, it will return zero.

Return Values:
Returns a numeric value.

Example:

<cfset my_birthday = "June 9, 1979">
My birthday is in <cfoutput>#DaysTilBirthday(my_birthday)#</cfoutput> day(s).

Parameters:

Full UDF Source:

/**
 * Returns number of days until your next birthday.
 * 
 * @param birthdate      Birthdate you want to find the number of days until.  Accepts any valid date object. 
 * @return Returns a numeric value. 
 * @author Jason Fuller (jason@yomamma.com) 
 * @version 1, February 12, 2002 
 */
function DaysTilBirthday(birthdate) {
  var daysRemaining = "";
  if (DateFormat(now(), "MMDD") GT DateFormat(birthdate, "MMDD")) 
    daysRemaining = Int(CreateDate(DatePart("yyyy", now() + 365), DatePart("m", birthdate), DatePart("d", birthdate)) - now() + 1);
  else 
    daysRemaining = Int(CreateDate(DatePart("yyyy", now()), DatePart("m", birthdate), DatePart("d", birthdate)) - now() + 1);
  Return daysRemaining;
}