Following is my code to get current date.
-(NSString *) getCurrentDate {
NSDateFormatter *dateformater = [[NSDateFormatter alloc]init];
[dateformater setDateFormat:#"dd-MMM-yyyy"];
NSString *today=[dateformater stringFromDate:[NSDate date]];
return today;
}
Im using the following code to find the difference between current date and the date selected from pickerview
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"dd-MMM-yyyy"];
NSString *date = [dateFormat stringFromDate:picker.date];
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:GregorianCalendar];
NSCalendarUnit unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:#"dd-MMM-yyyy"];
NSDate *selectedDate = [f dateFromString:date];
NSDate *currentDate = [f dateFromString:[self getCurrentDate]];
NSDateComponents *currentDateComponent = [gregorianCalendar components:unitFlags fromDate:currentDate toDate:selectedDate options:0];
but the currentDateComponent.day always prints the value 10.
whats wrong with my code? how can i be able to find the difference between two dates?
I think components you are using is wrong it should but only NSCalendarUnitDay
My code is returning me correct difference (difference.day).
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *difference = [calendar components:NSCalendarUnitDay
fromDate:[NSDate date] toDate:enDate options:0];
Related
I am trying to store dates in NSDate but not getting proper output.
Writing the code snippet below.
NSDate *firstDate = [NSDate dateWithYear:2015 month:12 day:1 ];
Expecting the output to be 2015-12-1 18:30:00 +0000.
But getting 2015-11-30 18:30:00 +0000
Ignore the time stamp.
dateWithYear:month:day is a category method which is there in the 3rd party calendar which I am using.the code of the method is as follows:
+ (NSDate *)dateWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day {
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [NSDate componentsWithYear:year month:month day:day];
return [calendar dateFromComponents:components];
}
return [calendar dateFromComponents:components];
is
+ (NSDateComponents *)componentsWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day {
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setYear:year];
[components setMonth:month];
[components setDay:day];
return components;
}
Thanks in Advance.
There are many ways to set a date from data,
NSDateFormatter :
NSString *dateString = #"2015-12-01";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = #"yyyy-MM-dd";
NSDate *date1 = [dateFormatter dateFromString:dateString];
NSDateComponents : (you can add setSecond, setMinute, setHour for a specific time)
NSDateComponents *dateComps = [[NSDateComponents alloc] init];
[dateComps setYear:2015];
[dateComps setMonth:12];
[dateComps setDay:1];
NSDate *date2 = [[NSCalendar currentCalendar] dateFromComponents:dateComps];
This question already has an answer here:
NSDateFormatter - 1 day incorrect?
(1 answer)
Closed 7 years ago.
I try to get first date for the current month from [NSDate new]. My problem is that instead of 2015/06/01 I always receive 2015/05/31. I even try to convert string 20150601 to NSDate and I still receive 2015/05/31.
Here is my CODE (for the second element):
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"yyyyMMdd"];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
currentMonth = [dateFormatter dateFromString:#"20150601"];
The result is:
(lldb) print currentMonth
(__NSDate *) $0 = 0x79e64820 2015-05-31 21:00:00 UTC
EDIT:
Ok, I understand my mistake - I don't check correctly result of my operations. They always result in UTC.
10x, for answer and all comments. I will be more careful next time.
NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:(NSEraCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit) fromDate:today];
components.day = 1;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
NSTimeZone *zone = [NSTimeZone localTimeZone];
[formatter setTimeZone:zone];
[formatter setDateFormat:#"yyyyMMdd"];
NSDate *dayOneInCurrentMonth = [gregorian dateFromComponents:components];
NSString *currentMonth = [formatter stringFromDate:dayOneInCurrentMonth];
NSLog(#"%#",currentMonth);
Output
2015-06-08 14:07:30.924 NSDATEDemo[1943:39838] 20150601
Create NSDateComponents from [NSDate date], set the current day to 1 and re-create your NSDate object:
- (NSDate *) dateAtStartOfMonth
{
//Not tested!!!
NSDateComponents *comp = [[NSCalendar currentCalendar] components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:[NSDate date]];
[comp setDay:1];
return [[NSCalendar currentCalendar] dateFromComponents:comp];
}
i want to get the current date in format like this 24 February 2014 . i want
also get Islamic date in the same format as 5 jumada al-awwal 1436
how can i do that i saw other thing but most care about integer components.
i wrote this code which just get components
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger day = [components day];
NSInteger month = [components month];
NSInteger year = [components year];
NSLog(#"%#",components);
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"EEEE"];
NSLog(#"%#", [dateFormatter stringFromDate:[NSDate date]]);
i used this to Islamic date
NSCalendar *islamicCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSIslamicCalendar];
NSDate *today = [NSDate date];
[islamicCalendar rangeOfUnit:NSDayCalendarUnit startDate:&today interval:NULL forDate:today];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setCalendar:islamicCalendar];
[dateFormatter setTimeStyle:NSDateFormatterFullStyle];
[dateFormatter setDateStyle:NSDateFormatterFullStyle];
//english output
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:#"en_US_POSIX"];
NSString * islamicDateString = [dateFormatter stringFromDate:today];
NSLog(#"%#", islamicDateString);
i am trying to implement calendar. i have one label for year and two buttons for incrementing and decrementing year from calendar. i am getting this exception (Thread1: EXC_BAD_ACCESS(code=1,address=0x5146a345)) while clicking button(increment or decrement)my requirement is if i click right button my year should increase as well as if i click left button my year should decrease. my exception line is date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0]; could you please help to resolve this issue. this is my code
- (void)viewDidLoad
{
[super viewDidLoad];
date = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"YYYY"];
NSString *stringFromDate = [formatter stringFromDate:date];
yar1.text=stringFromDate;
}
- (IBAction)right:(id)sender {
NSCalendar *cal = [NSCalendar currentCalendar];
date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"YYYY"];
NSString *stringFromDate = [formatter stringFromDate:date];
yar1.text=stringFromDate;
}
- (IBAction)left:(id)sender {
NSCalendar *cal = [NSCalendar currentCalendar];
date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"YYYY"];
NSString *stringFromDate = [formatter stringFromDate:date];
yar1.text=stringFromDate;
}
You need a date component to change the date like this,
-(NSDate *)offsetYear:(int)numOfYears date:(NSDate*)date
{
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setYear:numOfYears];
return [[NSCalendar currentCalendar] dateByAddingComponents:offsetComponents
toDate:date options:0]; }
Pass the offset as 1 for right and -1 for left
I have following code to convert string to date. Is it possible that it sets time as "00:00:00" and not the current time?
NSDateFormatter *dateformat = [[NSDateFormatter alloc] init];
[dateformat setDateFormat:#"yyyy-MM-dd"];
NSString *str = #"2014-08-08";
NSDate *dt = [dateformat dateFromString:str];
This gives dt as "2014-08-08 15:20:00 +0000" because I did the operation at 15:20.
Edit: I am using this date to convert it to integer later to store it in database:
int t = [dt timeIntervalSince1970];
If you are displaying the date dt with NSLog you will see what the date description method provides. If you want to see the date in a specific way that suits you use NSDateFormatter to format the date.
Example:
NSDateFormatter *dateformat = [[NSDateFormatter alloc] init];
[dateformat setDateFormat:#"yyyy-MM-dd"];
NSString *str = #"2014-08-08";
NSDate *dt = [dateformat dateFromString:str];
NSDateFormatter *displayDateformat = [[NSDateFormatter alloc] init];
[displayDateformat setDateFormat:#"yyyy-MM-dd"];
NSString *displayDateString = [displayDateformat stringFromDate:dt];
NSLog(#"displayDateString: %#", displayDateString);
Output:
2014-08-08
Note per Apple docs: "This method returns a time value relative to an absolute reference date—the first instant of 1 January 2001, GMT."
A good practice is to use NSDateComponents
NSDate *yourDate = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *dateComponents = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:yourDate];
[calendar setTimeZone:[NSTimeZone localTimeZone]];
// Set the time components manually
[dateComponents setHour:0];
[dateComponents setMinute:0];
[dateComponents setSecond:0];
yourDate = [calendar dateFromComponents:dateComponents];
Update
iOS8 :
[[NSCalendar currentCalendar] startOfDayForDate:[NSDate date]];