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How to Display a Time Interval
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Gary L. Wade
As has been discussed before, you most likely won’t have to roll your own with the modern, non-deprecated frameworks. If you do need something that seems basic but you can’t find it, please write a bug and include its number here. I’m sure there are some, but that’s how you get things changed.
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-- Gary On May 19, 2019, at 3:42 AM, Peter Hudson via Groups.Io <Peter.hudson@...> wrote: |
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You want NSDateComponentsFormatter: /* NSDateComponentsFormatter provides locale-correct and flexible string formatting of quantities of time, such as "1 day" or "1h 10m", as specified by NSDateComponents. For formatting intervals of time (such as "2PM to 5PM"), see NSDateIntervalFormatter. NSDateComponentsFormatter is thread-safe, in that calling methods on it from multiple threads will not cause crashes or incorrect results, but it makes no attempt to prevent confusion when one thread sets something and another thread isn't expecting it to change. |
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Peter Hudson
Hi Dave
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I seem to remember using NSCalendatDate and the descriptionWithCalendarFormat: method to get what you want. NSCalendarDate is now deprecated - the docs advocate the use of NSDate, NSCalendar, NSDateComponents to do the job now. You have to roll the final string yourself - as far as I can see... Peter On 19 May 2019, at 11:02, Dave <dave@...> wrote: |
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Dave
They wanted the number of weeks - I didn’t ask questions, plus the Total Number of Weeks and Total Number of days.
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Cheers Dave On 20 May 2019, at 14:50, Steve Mills via Groups.Io <sjmills@...> wrote: |
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Steve Mills
On May 20, 2019, at 04:26:31, Dave <dave@...> wrote:
*snip* I'm not sure why you needed to reinvent the wheel when NSCalendar and NSDateComponents already does this via: -(NSDateComponents*) components:(NSCalendarUnit)unitFlags fromDate:(NSDate*)startingDate toDate:(NSDate*)resultDate options:(NSCalendarOptions)opts; All you need to do is format the string, like you did. Plus, you didn't display months, and most people would want to see that rather than having to do math in their head. -- Steve Mills Drummer, Mac geek |
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Dave
Hi,
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As far as I know I don’t have to worry about leap years, get the Interval between now and some future date, this includes all the leap years in between. I am displaying it at the moment by dividing by the number of seconds in a year, week, hours and minute which is accurate enough for this applications. Here is a method to do it: #define kLTWTimeSecondsPerMinute 60 #define kLTWTimeMinutesPerHour 60 #define kLTWTimeSecondsPerHour (kLTWTimeSecondsPerMinute * kLTWTimeMinutesPerHour) #define kLTWTimeHoursPerDay 24 #define kLTWTimeDaysPerWeek 7 #define kLTWTimeWeeksPerYear 52 #define kLTWTimeSecondsPerDay (kLTWTimeSecondsPerHour * kLTWTimeHoursPerDay) #define kLTWTimeSecondsPerWeek (kLTWTimeSecondsPerDay * kLTWTimeDaysPerWeek) #define kLTWTimeSecondsPerYear (kLTWTimeSecondsPerWeek * kLTWTimeWeeksPerYear) -(NSString*) newIntevalStringWithDateString:(NSString*) theDateString andTitleString:(NSString*) theTitleString { NSDateFormatter* myDateFormatter; NSDate* myIntevalDate; NSString* myIntevalString; NSTimeInterval myWorkTimeInteval; NSInteger myNumberOfYears; NSInteger myNumberOfWeeks; NSInteger myNumberOfDays; NSInteger myNumberOfHours; NSInteger myNumberOfMinutes; myDateFormatter = [[NSDateFormatter alloc] init]; [myDateFormatter setDateFormat:@"yyyy-MM-dd"]; myIntevalDate = [myDateFormatter dateFromString:theDateString]; myWorkTimeInteval = [myIntevalDate timeIntervalSinceNow]; myNumberOfYears = myWorkTimeInteval / kLTWTimeSecondsPerYear; myWorkTimeInteval = myWorkTimeInteval - (myNumberOfYears * kLTWTimeSecondsPerYear); myNumberOfWeeks = myWorkTimeInteval / kLTWTimeSecondsPerWeek; myWorkTimeInteval = myWorkTimeInteval - (myNumberOfWeeks * kLTWTimeSecondsPerWeek); myNumberOfDays = myWorkTimeInteval / kLTWTimeSecondsPerDay; myWorkTimeInteval = myWorkTimeInteval - (myNumberOfDays * kLTWTimeSecondsPerDay); myNumberOfHours = myWorkTimeInteval / kLTWTimeSecondsPerHour; myWorkTimeInteval = myWorkTimeInteval - (myNumberOfHours * kLTWTimeSecondsPerHour); myNumberOfMinutes = myWorkTimeInteval / kLTWTimeSecondsPerMinute; myWorkTimeInteval = myWorkTimeInteval - (myNumberOfMinutes * kLTWTimeSecondsPerMinute); myIntevalString = [[NSString alloc] initWithFormat:@"%@ - Years: %zd Weeks: %2zd Days: %zd Hours: %zd Minutes: %zd",theTitleString,myNumberOfYears,myNumberOfWeeks,myNumberOfDays,myNumberOfHours,myNumberOfMinutes]; return myIntevalString; } All the Best Dave
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Shane Stanley
On 20 May 2019, at 4:20 am, Gary L. Wade <garywade@...> wrote:
If he has a time interval, why not just use NSDateComponentsFormatter's -stringFromTimeInterval:? Either way, be aware that NSDateComponentsFormatter doesn't cope with an interval of 2^32 or above. Which seems a bit extraordinary, given it didn't appear until macOS 10.10. -- Shane Stanley <sstanley@...> <www.macosxautomation.com/applescript/apps/>, <latenightsw.com> |
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Gary L. Wade
Sorry, forgot the last part. After you get the components using the calendar you wish to use with your two dates, then call NSDateComponentsFormatter. For a simple case, you could get by with:
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+ (nullable NSString *)localizedStringFromDateComponents:(NSDateComponents *)components unitsStyle:(NSDateComponentsFormatterUnitsStyle) unitsStyle; -- Gary L. Wade
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Marco S Hyman
Ooops, I’m wrong...
Can not be done accurately using only a Time Interval in seconds. You also need either the start or end date to figure out leap year complications.Leap year complications should be part of the time interval and be ignored. My programming history got the better of my knowledge... the first ever COBOL program I wrote figured out how many days until my military enlistment was over -- and it was off by one because of a leap year. |
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Gary L. Wade
Use NSCalendar’s method:
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- (NSDateComponents *)components:(NSCalendarUnit)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSCalendarOptions)opts; -- Gary L. Wade
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Marco S Hyman
I have the Time Interval between now and the future date in seconds, but I can’t seem to find any methods to display this in terms of years. months, weeks, days etc.Can not be done accurately using only a Time Interval in seconds. You also need either the start or end date to figure out leap year complications. Is there a method or class somewhere that does this or do I need to roll my own?Don’t know of any. I’d probably roll my own. Marc |
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Shane Stanley
On 19 May 2019, at 8:02 pm, Dave <dave@...> wrote:
There's NSDateComponentsFormatter, although it's fairly limited. -- Shane Stanley <sstanley@...> <www.macosxautomation.com/applescript/apps/>, <latenightsw.com> |
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Owen Hartnett
Look at the NSDate and NSDateFormatter classes.
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-Owen On May 19, 2019, at 6:02 AM, Dave <dave@...> wrote: |
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Dave
Objective-C, Mac.
Hi, I’m trying to display a countdown to a date in the future e.g. the number of years, weeks and days to 1/1/2021. I have the Time Interval between now and the future date in seconds, but I can’t seem to find any methods to display this in terms of years. months, weeks, days etc. Is there a method or class somewhere that does this or do I need to roll my own? All the Best Dave |
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