I am struggling with updating UILabel for count down for that I use following code
- (void)updateLabel {
// convert date string to date then set to a label
NSDateFormatter *dateStringParser = [[NSDateFormatter alloc] init];
[dateStringParser setDateFormat:#"MM/dd/yyyy"];
NSLog(#"date from update label %#", _selectedBirthdate);
//OUTPUT date from update label 07/23/2013
NSDate *date = [dateStringParser dateFromString:_selectedBirthdate];
NSLog(#"date from update label %#", date);
NSTimeInterval timeInterval = [date timeIntervalSinceNow]; ///< Assuming this is in the future for now.
NSString *stringVariable = [self stringFromTimeInterval:timeInterval];
self.dayLable.text = [NSString stringWithFormat:#"%#", stringVariable];
self.hourLable.text = [NSString stringWithFormat:#"%#", stringVariable];
self.minutesLable.text = [NSString stringWithFormat:#"%#", stringVariable];
// i want to update this day hour minutes lable like this much of days hour and minutes remaining
NSLog(#"%#",stringVariable);
}
I use following method for counting days hours and minutes but I dont know whats the logic mind is not working here how to find days hours and minutes from interval
- (NSString *)stringFromTimeInterval:(NSTimeInterval)interval {
NSInteger ti = (NSInteger)interval;
NSLog(#"%d",ti);
// NSInteger seconds = ti % 60;
NSInteger days = (ti * 60);
NSInteger minutes = (ti / 60) % 60;
NSLog(#"%d",minutes);
NSInteger hours = (ti / 3600);
NSLog(#"%d",hours);
return [NSString stringWithFormat:#"%02i hours : %02i min", hours, minutes];
}
To count no. of days, months and years, apply below code.
double differenceSeconds;
double datediff;
NSDateFormatter* df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"YYYY-MM-dd HH:mm:ss ZZZ"];
[df setTimeZone:[NSTimeZone systemTimeZone]];
NSDate *todayDate = [NSDate date];
long long tdate =[todayDate timeIntervalSince1970];
datediff = tdate - yourdate;
int days=(int)((double)datediff/(3600.0*24.00));
int diffDay=datediff-(days*3600*24);
int diffhours=(int)((double)diffDay/3600.00);
int diffMin=diffDay-(diffhours*3600);
int diffminutes=(int)(diffMin/60.0);
I have an application in which i need to show a label in the tableview as Xseconds ago and xminutes&yseconds ago,X hrs ago like that.i am doing like this `
NSString *todaysdateString=[dict objectForKey:#"sendingtime"];
NSString *time = todaysdateString;
NSString*todaysdateString1=[NSString stringWithString: #" "];
NSDate *date1;
NSDate *date2;
//{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"HH:mm:ss"];
date1 = [formatter dateFromString:time];
date2 = [formatter dateFromString:[formatter stringFromDate:[NSDate date]]];
[formatter release];
//}
NSTimeInterval interval = [date1 timeIntervalSinceDate: date2];
float seconds = interval;
float hour = interval / 3600;
float minute =(interval - hour*3600) / 60;
NSLog(#"%02.0f,%02.0f,%02.0f",hour, minute, seconds);
`But this wont giving me the desired answers,I am getting like -0,00,-297 that is utterly wrong.Can anybody point me in where i am going wrong..
Use a NSCalendar to do this, maybe this code helps you
NSCalendar *c = [NSCalendar currentCalendar];
NSDateComponents *components = [c components:NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit
fromDate:initialDate
toDate:endDate
options:0];
and in the components variables you will have the differences, get it back using: components.day, components.minute and components.second
As your seconds is in negative, you should swap your date here
NSTimeInterval interval = [date1 timeIntervalSinceDate: date2];
to :
NSTimeInterval interval = [date2 timeIntervalSinceDate: date1];
And can do as :
NSInteger intervalInt=interval;
NSInteger seconds = intervalInt % 60;
NSInteger minutes = (intervalInt / 60) % 60;
NSInteger hours = intervalInt / (60 * 60);
NSString *result = [NSString stringWithFormat:#"%02ld:%02ld:%02ld", hours, minutes, seconds];
I need to check an event date, which should be between Current date and 60 days from now. The below code is used, but it is NOT working correctly. Please note, i'm getting event string like this - "2012-04-14T16:50:02Z" from my server.
// current date
double currDateInMilliSecs = [NSDate timeIntervalSinceReferenceDate] * 1000;
NSLog(#"currDateInMilliSecs: %f", currDateInMilliSecs);
// sixty days
double sixtydaysvalue = 60.0 * 24.0 * 3600.0 * 1000.0;
NSLog(#"sixtydaysvalue: %f", sixtydaysvalue);
// add current date + sixt days
double sixtyDaysMilliSecsFromCurrDate = currDateInMilliSecs + sixtydaysvalue;
NSLog(#"sixtyDaysMilliSecsFromCurrDate: %f", sixtyDaysMilliSecsFromCurrDate);
// check does the event date between current date + 60 days
NSDateFormatter *df = [[NSDateFormatter alloc] init];
//[df setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
[df setDateFormat:#"yyyy-MM-dd'T'HH:mm:ss'Z'"];
//[df setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
// [eventDict objectForKey:#"begin_at"] gives date string like this "2012-04-14T16:50:02Z" for ex.
NSDate *eventdate = [df dateFromString:[eventDict objectForKey:#"begin_at"]];
NSTimeInterval nowSinceEventDate = [eventdate timeIntervalSince1970];
NSLog(#"nowSinceEventDate: %f", nowSinceEventDate);
double eventDateInMilliSecs = nowSinceEventDate * 1000;
NSLog(#"eventDateInMilliSecs: %f", eventDateInMilliSecs);
// this is not working as expected
if ( eventDateInMilliSecs<sixtyDaysMilliSecsFromCurrDate && eventDateInMilliSecs>currDateInMilliSecs )
{
}
else
{
}
You're trying to solve this as if it were Java, which it's not. Instead, try using things from the Cocoa Touch frameworks. Since your calculations are rather simple, you can do them with dates, but more complex things can pretty easily be done using NSCalendar and NSDateComponents.
A simple solution to your problem (here we assume eventdate is the date you created using your formatter):
NSDate* now = [NSDate date];
NSDate* sixtyDaysFromNow = [now dateByAddingTimeInterval:(60 * 60 * 24 * 60)];
if( [eventDate earlierDate:now] == now && [eventDate laterDate:sixtyDaysFromNow] == sixtyDaysFromNow ) {
// the event date is within scope
} else {
// the event date is outside stop
}
use my function for comparing date its working on my project
i hope its help you
-(BOOL)date:(NSDate*)date isBetweenDate:(NSDate*)beginDate andDate:(NSDate*)endingDate
{
if ([date compare:beginDate] == NSOrderedAscending)
return NO;
if ([date compare:endingDate] == NSOrderedDescending)
return NO;
return YES;
}
I have one query regarding NSDate. I have a date i.e. "2011-10-04 07:36:38 +0000", and I want to check if this date is yesterday, or today or a future date.
How would I go about this?
Try this:
Note: Change the date format as per your need.
NSDateFormatter* df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"MM/dd/yyyy"];
NSDate* enteredDate = [df dateFromString:#"10/04/2011"];
NSDate * today = [NSDate date];
NSComparisonResult result = [today compare:enteredDate];
switch (result)
{
case NSOrderedAscending:
NSLog(#"Future Date");
break;
case NSOrderedDescending:
NSLog(#"Earlier Date");
break;
case NSOrderedSame:
NSLog(#"Today/Null Date Passed"); //Not sure why This is case when null/wrong date is passed
break;
}
See Apple's documentation on date calculations:
NSDate *startDate = ...;
NSDate *endDate = ...;
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents *components = [gregorian components:unitFlags
fromDate:startDate
toDate:endDate options:0];
NSInteger months = [components month];
NSInteger days = [components day];
If days is between +1 and -1 then your date is a candidate for being "today". Obviously you'll need to think about how you handle hours. Presumably the easiest thing would be to set all dates to be 00:00.00 hours on the day in question (truncate the date using an approach like this), and then use those values for the calculation. That way you'd get 0 for today, -1 for yesterday, +1 for tomorrow, and any other value would likewise tell you how far things were in the future or the past.
Use any of the folowing according to ur need,
– earlierDate:
– laterDate:
– compare:
Refer this http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html
-(NSString*)timeAgoFor:(NSString*)tipping_date
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSDate *date = [dateFormatter dateFromString:tipping_date];
NSString *key = #"";
NSTimeInterval ti = [date timeIntervalSinceDate:[NSDate date]];
key = (ti > 0) ? #"Left" : #"Ago";
ti = ABS(ti);
NSDate * today = [NSDate date];
NSComparisonResult result = [today compare:date];
if (result == NSOrderedSame) {
return[NSString stringWithFormat:#"Today"];
}
else if (ti < 86400 * 2) {
return[NSString stringWithFormat:#"1 Day %#",key];
}else if (ti < 86400 * 7) {
int diff = round(ti / 60 / 60 / 24);
return[NSString stringWithFormat:#"%d Days %#", diff,key];
}else {
int diff = round(ti / (86400 * 7));
return[NSString stringWithFormat:#"%d Wks %#", diff,key];
}
}
I have a time interval that spans years and I want all the time components from year down to seconds.
My first thought is to integer divide the time interval by seconds in a year, subtract that from a running total of seconds, divide that by seconds in a month, subtract that from the running total and so on.
That just seems convoluted and I've read that whenever you are doing something that looks convoluted, there is probably a built-in method.
Is there?
I integrated Alex's 2nd method into my code.
It's in a method called by a UIDatePicker in my interface.
NSDate *now = [NSDate date];
NSDate *then = self.datePicker.date;
NSTimeInterval howLong = [now timeIntervalSinceDate:then];
NSDate *date = [NSDate dateWithTimeIntervalSince1970:howLong];
NSString *dateStr = [date description];
const char *dateStrPtr = [dateStr UTF8String];
int year, month, day, hour, minute, sec;
sscanf(dateStrPtr, "%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &minute, &sec);
year -= 1970;
NSLog(#"%d years\n%d months\n%d days\n%d hours\n%d minutes\n%d seconds", year, month, day, hour, minute, sec);
When I set the date picker to a date 1 year and 1 day in the past, I get:
1 years 1 months 1 days 16 hours 0
minutes 20 seconds
which is 1 month and 16 hours off. If I set the date picker to 1 day in the past, I am off by the same amount.
Update: I have an app that calculates your age in years, given your birthday (set from a UIDatePicker), yet it was often off. This proves there was an inaccuracy, but I can't figure out where it comes from, can you?
Brief Description
Just another approach to complete the answer of JBRWilkinson but adding some code. It can also offers a solution to Alex Reynolds's comment.
Use NSCalendar method:
(NSDateComponents *)components:(NSUInteger)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSUInteger)opts
"Returns, as an NSDateComponents object using specified components, the difference between two supplied dates". (From the API documentation).
Create 2 NSDate whose difference is the NSTimeInterval you want to break down. (If your NSTimeInterval comes from comparing 2 NSDate you don't need to do this step, and you don't even need the NSTimeInterval, just apply the dates to the NSCalendar method).
Get your quotes from NSDateComponents
Sample Code
// The time interval
NSTimeInterval theTimeInterval = ...;
// Get the system calendar
NSCalendar *sysCalendar = [NSCalendar currentCalendar];
// Create the NSDates
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [[NSDate alloc] initWithTimeInterval:theTimeInterval sinceDate:date1];
// Get conversion to months, days, hours, minutes
NSCalendarUnit unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;
NSDateComponents *breakdownInfo = [sysCalendar components:unitFlags fromDate:date1 toDate:date2 options:0];
NSLog(#"Break down: %i min : %i hours : %i days : %i months", [breakdownInfo minute], [breakdownInfo hour], [breakdownInfo day], [breakdownInfo month]);
This code is aware of day light saving times and other possible nasty things.
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorianCalendar components: (NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit )
fromDate:startDate
toDate:[NSDate date]
options:0];
NSLog(#"%ld", [components year]);
NSLog(#"%ld", [components month]);
NSLog(#"%ld", [components day]);
NSLog(#"%ld", [components hour]);
NSLog(#"%ld", [components minute]);
NSLog(#"%ld", [components second]);
From iOS8 and above you can use NSDateComponentsFormatter
It has methods to convert time difference in user friendly formatted string.
NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
formatter.unitsStyle = NSDateComponentsFormatterUnitsStyleFull;
NSLog(#"%#", [formatter stringFromTimeInterval:1623452]);
This gives the output - 2 weeks, 4 days, 18 hours, 57 minutes, 32 seconds
Convert your interval into an NSDate using +dateWithIntervalSince1970, get the date components out of that using NSCalendar's -componentsFromDate method.
SDK Reference
This works for me:
float *lenghInSeconds = 2345.234513;
NSDate *date = [NSDate dateWithTimeIntervalSinceReferenceDate:lenghInSeconds];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
[formatter setDateFormat:#"HH:mm:ss"];
NSLog(#"%#", [formatter stringFromDate:date]);
[formatter release];
The main difference here is that you need to adjust for the timezone.
Or there is my class method. It doesn't handle years, but that could easily be addedn though it's better for small timelaps like days, hours and minutes. It take plurals into account and only shows what's needed:
+(NSString *)TimeRemainingUntilDate:(NSDate *)date {
NSTimeInterval interval = [date timeIntervalSinceNow];
NSString * timeRemaining = nil;
if (interval > 0) {
div_t d = div(interval, 86400);
int day = d.quot;
div_t h = div(d.rem, 3600);
int hour = h.quot;
div_t m = div(h.rem, 60);
int min = m.quot;
NSString * nbday = nil;
if(day > 1)
nbday = #"days";
else if(day == 1)
nbday = #"day";
else
nbday = #"";
NSString * nbhour = nil;
if(hour > 1)
nbhour = #"hours";
else if (hour == 1)
nbhour = #"hour";
else
nbhour = #"";
NSString * nbmin = nil;
if(min > 1)
nbmin = #"mins";
else
nbmin = #"min";
timeRemaining = [NSString stringWithFormat:#"%#%# %#%# %#%#",day ? [NSNumber numberWithInt:day] : #"",nbday,hour ? [NSNumber numberWithInt:hour] : #"",nbhour,min ? [NSNumber numberWithInt:min] : #"00",nbmin];
}
else
timeRemaining = #"Over";
return timeRemaining;
}
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];
// format: YYYY-MM-DD HH:MM:SS ±HHMM
NSString *dateStr = [date description];
NSRange range;
// year
range.location = 0;
range.length = 4;
NSString *yearStr = [dateStr substringWithRange:range];
int year = [yearStr intValue] - 1970;
// month
range.location = 5;
range.length = 2;
NSString *monthStr = [dateStr substringWithRange:range];
int month = [monthStr intValue];
// day, etc.
...
- (NSString *)convertTimeFromSeconds:(NSString *)seconds {
// Return variable.
NSString *result = #"";
// Int variables for calculation.
int secs = [seconds intValue];
int tempHour = 0;
int tempMinute = 0;
int tempSecond = 0;
NSString *hour = #"";
NSString *minute = #"";
NSString *second = #"";
// Convert the seconds to hours, minutes and seconds.
tempHour = secs / 3600;
tempMinute = secs / 60 - tempHour * 60;
tempSecond = secs - (tempHour * 3600 + tempMinute * 60);
hour = [[NSNumber numberWithInt:tempHour] stringValue];
minute = [[NSNumber numberWithInt:tempMinute] stringValue];
second = [[NSNumber numberWithInt:tempSecond] stringValue];
// Make time look like 00:00:00 and not 0:0:0
if (tempHour < 10) {
hour = [#"0" stringByAppendingString:hour];
}
if (tempMinute < 10) {
minute = [#"0" stringByAppendingString:minute];
}
if (tempSecond < 10) {
second = [#"0" stringByAppendingString:second];
}
if (tempHour == 0) {
NSLog(#"Result of Time Conversion: %#:%#", minute, second);
result = [NSString stringWithFormat:#"%#:%#", minute, second];
} else {
NSLog(#"Result of Time Conversion: %#:%#:%#", hour, minute, second);
result = [NSString stringWithFormat:#"%#:%#:%#",hour, minute, second];
}
return result;
}
Here's another possibility, somewhat cleaner:
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];
NSString *dateStr = [date description];
const char *dateStrPtr = [dateStr UTF8String];
// format: YYYY-MM-DD HH:MM:SS ±HHMM
int year, month, day, hour, minutes, seconds;
sscanf(dateStrPtr, "%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &minutes, &seconds);
year -= 1970;