I'm using the code provided below to display time and date. can anyone help me with atuomatically changing the time by seconds and the date by the day?
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-dd"];
NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:#"HH:mm:ss"];
NSDate *now = [[NSDate alloc] init];
NSString *theDate = [dateFormat stringFromDate:now];
NSString *theTime = [timeFormat stringFromDate:now];
NSLog(#"\n"
"theDate: |%#| \n"
"theTime: |%#| \n"
, theDate, theTime);
[dateFormat release];
[timeFormat release];
[now release];
You can use NSTimer, specifically scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:. You can use 1 as a time interval.
Use the NSDateComponents class. For example, to add one day and one second to a date:
NSDate *startDate = [NSDate date];
unsigned unitFlags = NSDayCalendarUnit | NSSecondCalendarUnit;
NSCalendar *curr = [NSCalendar currentCalendar];
NSDateComponents *oneDay = [[NSDateComponents alloc] init];
oneDay.day = 1;
oneDay.second = 1;
NSDate* adjustedDate = [curr dateByAddingComponents:oneDay
toDate:startDate
options:0];
Date and Time programming guide
Related
I'm working with local notification. But while I set time for notification, its also consider second.
This is the code where I set time.
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"HH:mm"];
[tfTime setText:[NSString stringWithFormat:#"%#",[df stringFromDate:datePicker.date]]];
selectedDateTime = [datePicker date];
I want notification on rounded time, without second.
UILocalNotification *notification = [[UILocalNotification alloc] init];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc]init];
//[dateFormat setDateFormat:#"dd-MM-yyyy"];
//NSDate *notificationDate = [dateFormat dateFromString:strRemindMeBefore];
notification.fireDate = selectedDateTime;
notification.alertBody = tvMessage.text;
notification.timeZone = [NSTimeZone defaultTimeZone];
notification.soundName = UILocalNotificationDefaultSoundName;
notification.applicationIconBadgeNumber = 1;
[[UIApplication sharedApplication] scheduleLocalNotification:notification];
A convenient method to "round" a date to minutes or other units is the rangeOfUnit:…
method of NSCalendar.
NSDate *selectedDateTime = [datePicker date];
NSDate *roundedDate;
NSCalendar *cal = [NSCalendar currentCalendar];
[cal rangeOfUnit:NSCalendarUnitMinute startDate:&roundedDate interval:NULL forDate:selectedDateTime];
// …
notification.fireDate = roundedDate;
What you can do is use the NSDateComponents as follows and set the seconds to 00, which might help... the following is a sample code where you can set all the components manually!
Hope this helps
NSDateComponents *comps = [[[NSDateComponents alloc] init] autorelease];
[comps setDay:1];
[comps setMonth:1];
[comps setYear:2013];
[comps setHour:10];
[comps setMinute:10];
/// You can set this component as 00
[comps setSecond:00];
localNotif.fireDate = [[NSCalendar currentCalendar] dateFromComponents:comps];
I've been trying and searching for over two days now.
The only thing I'm trying is to convert a week number "Week 50" to the start date of the week.
I've tried to convert with dateFromString like this:
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"w"];
NSDate *date = [dateFormat dateFromString:dateStr];
NSLog(#"date(%#)", date);
NSDateFormatter *formatting = [[NSDateFormatter alloc] init];
[formatting setDateFormat:#"YYYY/MM/dd"];
NSString *stringDate = [formatting stringFromDate:date];
NSLog(#"date: %#", stringDate);
[dateFormat release];
But both objects return (null) so it isn't of many help.
Regards
Have you tried the following:
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:2012];
[comps setWeek:50];
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *week50 = [cal dateFromComponents:comps];
You can try trimming the string to just the week number like "50" and then add the desired year number and use following:
NSString *dateStr=#"50 2011";
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"w YYYY"];
NSDate *date = [dateFormat dateFromString:dateStr];
NSLog(#"date(%#)", date);
i want to split the time in the interval of 30mins, so i can get time like this:
12:00 AM 12:10 AM 12:20 AM .......... till 11:50 PM.
i'm trying something like this :
NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:#"hh:mm a"];
NSDate* fromTime = [timeFormat dateFromString:startTime];
NSDate* toTime = [timeFormat dateFromString:endTime];
NSLog(#"Start time %#",fromTime);
NSLog(#"End time %#",toTime);
NSDate *dateByAddingThirtyMinute;
dateByAddingThirtyMinute = [fromTime dateByAddingTimeInterval:1800];
NSString *formattedDateString;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"hh:mm a"];
formattedDateString = [dateFormatter stringFromDate:dateByAddingThirtyMinute];
NSLog(#"Time after 10 min %#",formattedDateString);
but i am able to print the first ten minute splitting ...
can any one help me how to loop it ...
Both of the other answers are wrong, because they do not account for daylight savings time. To do that, you have to use NSDateComponents and NSCalendar:
NSDate *startDate = ...;
NSDate *endDate = ...;
NSDateComponents *diff = [[NSDateComponents alloc] init];
[diff setMinute:0];
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *tmp = startDate;
NSMutableArray *dates = [NSMutableArray arrayWithObject:tmp];
while ([tmp laterDate:endDate] == endDate) {
[diff setMinute:[diff minute] + 10];
tmp = [cal dateByAddingComponents:diff toDate:startDate options:0];
[dates addObject:tmp];
}
In this code, I'm not actually running the NSDate objects through the NSDateFormatter, because that should happen at a different level. This code is all about the underlying data (the Model), and NSDateFormatter usually operates at the user-visible level (the View). Plus, it's generally more useful to have the raw data object than the formatted string.
Try with below code
NSString *startTime = #"12:00 AM";
NSString *endTime = #"11:40 AM";
NSDateFormatter *timeFormat = [[[NSDateFormatter alloc] init] autorelease];
[timeFormat setDateFormat:#"hh:mm a"];
NSDate* fromTime = [timeFormat dateFromString:startTime];
NSDate* toTime = [timeFormat dateFromString:endTime];
NSDate *dateByAddingThirtyMinute ;
NSTimeInterval timeinterval = [toTime timeIntervalSinceDate:fromTime];
NSLog(#"time Int %f",timeinterval/3600);
float numberOfIntervals = timeinterval/3600;
NSLog(#"Start time %f",numberOfIntervals);
for(int iCount = 0;iCount<numberOfIntervals*6 ;iCount ++)
{
dateByAddingThirtyMinute = [fromTime dateByAddingTimeInterval:600];
fromTime = dateByAddingThirtyMinute;
NSString *formattedDateString;
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:#"hh:mm a"];
formattedDateString = [dateFormatter stringFromDate:dateByAddingThirtyMinute];
NSLog(#"Time after 10 min %#",formattedDateString);
}
Try this out
int numberOfIntervals = [toDate timeIntervalSinceDate:fromDate]/(10*60);
for (int i = 0; i < numberOfIntervals; i++) {
NSDate *theDate = [date dateByAddingTimeInterval:i * 60 * 10];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"hh:mm a"];
NSString *formattedDateString = [dateFormatter stringFromDate:dateByAddingThirtyMinute];
NSLog(#"Time after 10 min %#",formattedDateString);
[dateFormatter release];
}
I am try to remove time from date how to do this i try this code it not working proper where i am wrong
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *todaysDate = [NSDate date];
//NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
NSDateComponents*dateComponents = [gregorian components:NSDayCalendarUnit fromDate:todaysDate];
[dateComponents setDay:1];
app.selectionData.fromDateSelected = [gregorian dateByAddingComponents:dateComponents toDate:todaysDate options:0];
//[dateComponents release];
[gregorian release];
Are you trying to do this?
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
int comps = NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit;
NSDateComponents *dateComponents = [gregorian components:comps fromDate:[NSDate date]];
[dateComponents setDay:[dateComponents day] + 1];
app.selectionData.fromDateSelected = [gregorian dateFromComponents:dateComponents];
[gregorian release];
To only get the date, you can use NSDateFormatter
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
NSString* currentDate = [dateFormatter stringFromDate:[NSDate date]];
[dateFormatter release];
You can also supply your own format for the date.
For ex:
[dateFormattter setDateFormat:#"yyyy-mm-dd"];
You can refer to UTS #35 and Date Formatting Guide for more options on formatting.
Try this out. This works for me
NSDate *todaysDate = [NSDate date];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-dd"];
NSString *stringDate = [dateFormat stringFromDate:todaysDate];
NSLog(#"stringDate: %#",stringDate);
[dateFormat release];
EDIT:
NSDate *today = [NSDate date];
NSTimeInterval secondsPerDay = 24 * 60 * 60;
NSDate *date = [today addTimeInterval:secondsPerDay];
//Change NSDate *date = [tomorrow addTimeInterval:-secondsPerDay]; for yesterday
NSDate *tomorrow = date;
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-dd"];
NSString *stringDate = [dateFormat stringFromDate:tomorrow];
NSLog(#"stringDate: %#",stringDate);
[dateFormat release];
Hope this helps you.
i have a "DateTimeArray" this array contain
DateTimeArray[index 0] = 20.05.2011 12:12:50
DateTimeArray[index 1]= 20.05.2011 12:13:20
DateTimeArray[index 2]= 20.05.2011 12:20:10
all the value are in string,and i want to convert this string into NSDate and only want to access time not date
and then this time values will be stored in array and this newly array will be used for drawing line chart
i hope some one know this issue
thank you very much
Code as follows,
for(int index=0;index<[DateTimeArray count];index++)
{
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"HH:mm:ss"];
NSString *timeString=[[[DateTimeArray objectAtIndex:index]componentsSeparatedByString:#" "]objectAtIndex:1];
NSDate *time=[df dateFromString:timeString];
[timeArray addObject:time];
[df release];
}
Try this
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"HH:mm:ss"];
NSDate *formattedDate = [df dateFromString:[DateTimeArray objectAtIndex:requiredIndex]];
[df release];
Best and cleaner approach:
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"dd.MM.yyyy HH:mm:ss"];
for(int i=0; i < [DateTimeArray count]; ++i)
{
NSString *string = [DateTimeArray objectAtIndex:i];
NSDate *date = [df dateFromString:string];
[timeArray addObject:time];
}
[df release]; // ALWAYS release unused objects
Then to just access hours, and not days, you should select the required components of each NSDate* instance:
// Get the Gregorian calendar
NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// Get the date
NSDate* date = [timeArray objectAtIndex:my_index];
// Get the hours, minutes, seconds
NSDateComponents* hour = [cal components:NSHourCalendarUnit fromDate:date];
NSDateComponents* minute = [cal components:NSMinuteCalendarUnit fromDate:date];
NSDateComponents* second = [cal components:NSSecondCalendarUnit fromDate:date];
NSMutableArray *nsdateArray = [NSMutableArray arrayWithCapacity:[DateTimeArray count]];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"dd.MM.yyyy HH:mm:ss"];
for(NSString *currentString in DateTimeArray){
NSDate *date = [dateFormat dateFromString:currentString];
[nsdateArray addObject:date];
}
[dateFormat release];
NSLog(#"ArrayWithDate:%#",[nsdateArray description]);
Heres the complete set of code.. Hope it helps..
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"HH:mm:ss"];
int i=0;//start for{} loop
NSString *currDate = [formatter dateFromString:[DateTimeArray objectAtIndex:i]];
[formatter release];
Happy iCoding...
NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:#"HH:mm:ss"]
NSString *theTime = [timeFormat dateFromString:date];
or
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(kCFCalendarUnitHour | kCFCalendarUnitMinute) fromDate:date];
NSInteger hour = [components hour];
NSInteger minute = [components minute];