NSDateFormatter milliseconds bug

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It seems that NSDateFormatter works only with millisecond resolution, for the
following reasons:

  • By setting a breakpoint in CFDateFormatterCreateDateFromString, one can
    see that this function is called from dateFromString::

    (lldb) bt
* thread #1: tid = 0x26d03f, 0x018f47d0 CoreFoundation`CFDateFormatterCreateDateFromString, queue="com.apple.main-thread", stop reason = breakpoint 3.1
    frame #0: 0x018f47d0 CoreFoundation`CFDateFormatterCreateDateFromString
    frame #1: 0x0116e0ea Foundation`getObjectValue + 248
    frame #2: 0x0116dfc7 Foundation`-[NSDateFormatter getObjectValue:forString:errorDescription:] + 206
    frame #3: 0x0116879f Foundation`-[NSDateFormatter dateFromString:] + 71
  * frame #4: 0x00002d56 foo`main(argc=1, argv=0xbfffee54) + 182 at main.mm:25

  • CFDateFormatterCreateDateFromString() is from
    CFDateFormatter.c
    which is open source. One can see that all calendrical calculations are made using the
    ICU Calendar Classes.

  • It is stated in calendar.h that Calendar uses UDate which has a millisecond resolution:

    /**
 * <code>Calendar</code> is an abstract base class for converting between
 * a <code>UDate</code> object and a set of integer fields such as
 * <code>YEAR</code>, <code>MONTH</code>, <code>DAY</code>, <code>HOUR</code>,
 * and so on. (A <code>UDate</code> object represents a specific instant in
 * time with millisecond precision. See UDate
 * for information about the <code>UDate</code> class.)
 * ...

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