Xcode - NSTimeInterval Years double value, how to get MORE decimals?

Question

i wan't to know exactly how many years it is between 2 NSDate's. (current Date and Date picker date)

i'm using NSTimeInterval (seconds) how to make it to years?

This code will make the value to Years:

NSTimeInterval distanceBetweenDates = [now timeIntervalSinceDate:date];

double secondsInAnYear = 31536000;
double YearsBetweenDates = distanceBetweenDates / secondsInAnYear;

NSString *dateString = [NSString stringWithFormat:@"%f", YearsBetweenDates];

labelView.text = dateString;

but i just get 6 decimals!

i want more than 6 decimals. How?

`NSTimeInterval` is a `typedef` for `double`. See this question: http://stackoverflow.com/questions/5729004/how-to-print-a-double-with-full-precision-on-ios — Nate Chandler, Jan 13 '13 at 16:59
Is it possible to do: NSString *decimals =14; double x =3.1415926535897932384626433; label.text = [NSString stringWithFormat:@"%%@f", x, decimals]; is this possible to get 14 decimals of x? — Jonathan Gurebo, Jan 14 '13 at 22:18
One way: `[NSString stringWithFormat:[NSString stringWithFormat:@"%%.%@f", decimals], x]`. — Nate Chandler, Jan 14 '13 at 22:33

score 1 · Answer 1 · answered Jan 13 '13 at 17:19

1

Take a look at -[NSCalendar (NSDateComponents *)components:(NSUInteger)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSUInteger)opts]. This does the calculation correctly. You can't assume a year always is exactly 31536000 seconds (leap year, or even those leap second(s) that get added occasionally).

answered Jan 13 '13 at 17:19

Johan Kool

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This doesn't yield a decimal year. Only integers :( – Maciej Swic Dec 06 '13 at 18:46

Attila H · Answer 2 · 2013-01-13T17:08:54.523

0

Have you tried using %lf which is the designated specifier for long float/double values?

NSString *dateString = [NSString stringWithFormat:@"%lf", YearsBetweenDate];

edited Jan 13 '13 at 17:08

answered Jan 13 '13 at 17:03

Attila H

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Xcode - NSTimeInterval Years double value, how to get MORE decimals?

2 Answers2