I have 2 dates. Date1 in yyyy-MM-dd 21:00:00 +0000. Date2 in yyyy-MM-dd
I need to compare it and get age result.
Problem is that Ia have an error in NSDateComponents string.
NSDate *date1 = [NSDate date];
NSDate *date2temp = uBirthdate;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSString *dateString = [dateFormatter stringFromDate:date2temp];
[dateString stringByAppendingString:#" 21:00:00 +0000"];
NSDate *date2 = [dateFormatter dateFromString:dateString];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit fromDate:date2 toDate:date1 options:0];
NSInteger editedAge = components.year;
NSLog(#"%d ", editedAge);
It will be better to cut off '21:00:00 +0000' from date1, but I do not know how can I do it
Related
I want to change hour in NSDate. I did something like this:
NSDate *final = [gregorian dateBySettingUnit:NSCalendarUnitHour value:hour.intValue ofDate:self.dateForNewEvent options:NSCalendarMatchStrictly];
where self.dateForNewEvent = 2018-07-09 07:24:13 +0000
and hour.intValue = 5 and i expect date = 2018-07-09 05:00:00 + 0000 but i got 2018-07-10 03:00:00 UTC. How should I do it to get expected date ?
To change the hours of a specific NSDate, you need to manipulate it via NSDateComponents. Please try below code for the same:
NSDate *now = [NSDate date]; // YOUR DATE INSTANCE
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian];
NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate:now];
[components setHour:5];
NSDate *today5am = [calendar dateFromComponents:components];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
NSLog(#"Date ===>>> %#",[dateFormatter stringFromDate:[NSDate date]]);
Hope this helps!
I think you are mixing NSDate with NSCalendar: NSDate is a point in time, internally represented in UTC. To get the local date/time as it is displayed on a calendar or watch , you use NSCalendar.
So if you are in MEST (UTC+2) and set the time to "5" hours on your calendar, this will be UTC "3" hours.
To get the calendar date/time back, you could use components(_:from:) from NSCalendar.
Just check this code:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd'T'HH:mm:ssZZZZZ"];
NSDate * dateForNewEvent = [dateFormatter dateFromString: #"2018-07-09T07:24:13+00:00"];
NSLog(#"dateForNewEvent: %#", dateForNewEvent);
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear|NSCalendarUnitHour|NSCalendarUnitMinute fromDate:dateForNewEvent];
[comps setHour:5];
NSDate *final = [gregorian dateFromComponents:comps];
NSLog(#"final: %#", final);
Output as expected:
2018-07-09 11:11:43.542 jdoodle[22:22] dateForNewEvent: 2018-07-09 07:24:13 +0000
2018-07-09 11:11:43.542 jdoodle[22:22] final: 2018-07-09 05:24:00 +0000
I want to get day/month and hour:minute from "12/10/2015 6:11:04 PM" format date. I am from Turkey so our date format is 23 hours. When I use the code below, it returns date "nil".
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
[dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:#"tr_TR_POSIX"]];
[dateFormatter setDateFormat:#"d/m/yyyy h:mm:ss a"];
NSDate *date = [dateFormatter dateFromString:#"12/10/2015 6:11:04 PM"];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitHour | NSCalendarUnitMinute) fromDate:date];
NSInteger hour = [components hour];
NSInteger minute = [components minute];
change dateformat like and try
[dateFormatter setDateFormat:#"dd/MM/yyyy h:mm:ss a"];
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]];
I am using following piece of code to get next week date from a given date at 12:00am:
NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit |NSHourCalendarUnit fromDate:now];
[components setHour:0];
NSDate *todayDate = [calendar dateFromComponents:components];
int daysToAdd = 7;
NSDate *tomorrowDate = [todayDate dateByAddingTimeInterval:60*60*24*daysToAdd];
NSString *stringDate = [NSString stringWithFormat:#"%#",tomorrowDate];
todoItemDueDateText.text = stringDate;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"EEEE, dd MMMM YYYY"];
NSString *fechasimulada = [dateFormatter stringFromDate:tomorrowDate];
dateFieldSimulatedText.text = fechasimulada;
If I log the result date, it is working fine.
Now, a similar piece of code to get next month date from a given date at 12:00am:
NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
[components setHour:0];
NSDate *todayDate = [calendar dateFromComponents:components];
//NSDate *today = [NSDate date];
NSDateComponents* dateComponents = [[NSDateComponents alloc]init];
[dateComponents setMonth:1];
//NSCalendar* calendar = [NSCalendar currentCalendar];
NSDate* tomorrowDate = [calendar dateByAddingComponents:dateComponents toDate:todayDate options:0];
NSString *stringDate = [NSString stringWithFormat:#"%#",tomorrowDate];
todoItemDueDateText.text = stringDate;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"EEEE, dd MMMM YYYY"];
NSString *fechasimulada = [dateFormatter stringFromDate:tomorrowDate];
I don't know why, but the second piece of code gives the expected date but -1 hour.
UPDATE:
I will show you the dates:
Source date (today at 12:00am)+7 h
Next week date from previous given date:
Next month date from previous given date:
NSDate takes Daylight Savings into account. If you cross a DST day, you'll experience this issue.
In short words I plan to get current dateTime, change the time and make it local to Malaysia Time by applying +0800 to timezone.
The result is unexpected :
-(NSDate *)departureDateTime
{
NSDate *date = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];
NSDateComponents *components = [gregorian components: NSUIntegerMax fromDate: date];
[components setHour: 7];
[components setMinute: 59];
[components setSecond: 17];
NSDate *newDate = [gregorian dateFromComponents: components];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-mm-dd HH:mm:ss Z"];
[dateFormat setLocale:[NSLocale currentLocale]];
NSString *newDateString = [NSString stringWithFormat:#"%#",newDate];
NSString *maskString = [NSString stringWithFormat:#"%#", [newDateString substringToIndex:20]];
NSString *append = [maskString stringByAppendingString:#"+0800"];
NSLog(#"%#",append);
NSDate *finalLocalDate = [dateFormat dateFromString:append];
return finalLocalDate;
}
Results :
for NSLog Append : 2013-12-07 23:59:17 +0800
but finalLocalDate : 2013-01-07 15:59:17 +0000
Found the answer with much shorter solution, so I posted here in case it helps anyone in future.
for returning, the problem was different time zones so by adding this line of
[components setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:(+0*3600) ] ];
we set the timezone to system time zone then we remove unnecessary codes :
-(NSDate *)departureDateTime
{
NSDate *date = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];
NSDateComponents *components = [gregorian components: NSUIntegerMax fromDate: date];
[components setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:(+0*3600) ] ];
[components setHour: 7];
[components setMinute: 59];
[components setSecond: 17];
NSDate *newDate = [gregorian dateFromComponents: components];
NSLog(#"%#",newDate);
return newDate;
}
Correct Result : 2013-12-08 07:59:17 +0000
try this:
NSTimeInterval now = [[NSDate date] timeIntervalSince1970];
NSDate *malaysianTime = [NSDate dateWithTimeIntervalSince1970:now+(8*60*60)]; //8h in seconds
If your computer is running in the correct timezone don't set a timezone.
Create your newDate value and then --
NSDateFormatter* fmt = [[NSDateFormatter alloc] init];
[fmt setDateFormat:#"yyyy-MM-dd HH:mm:ss Z"];
NSString* printableDate = [fmt stringFromDate:newDate];
NSLog(#"The date is %#", printableDate);
Only set a timezone (in both NSCalendar and NSDateFormatter) if the desired timezone is not the one your computer/phone is currently using.
Note that if you NSLog newDate directly it will print in GMT timezone. This is the way it's supposed to be -- you always use NSDateFormatter for a printable date. When you NSLog an NSDate directly you get GMT, by design.