iphone - How do you calculate the day of the year for a specific date in Objective-C? -

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this found myself spending hours figure out , therefore want share you.

the question was: how determine day of year specific date?

e.g. january 15 15th day , december 31 365th day when it's not leap year.

try this:

nscalendar *gregorian =    [[nscalendar alloc] initwithcalendaridentifier:nsgregoriancalendar]; nsuinteger dayofyear =    [gregorian ordinalityofunit:nsdaycalendarunit      inunit:nsyearcalendarunit fordate:[nsdate date]]; [gregorian release]; return dayofyear;

where date date want determine day of year for. documentation on nscalendar.ordinalityofunit method here.


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