I want to add 3 hours to my current date. I am using the following code to add hours but it adds 6 hours to the current date.
NSDate *n = [NSDate date];
int daysToAdd = 3; // or 60 :-)
// set up date components
NSDateComponents *components1 = [[[NSDateComponents alloc] init] autorelease];
[components1 setHour:daysToAdd];
// create a calendar
NSCalendar *gregorian12 = [NSCalendar currentCalendar];
NSDate *newDate2 = [gregorian12 dateByAddingComponents:components toDate:n options:0];
NSLog(#"Clean: %#", newDate2);
Result is :-
2013-09-10 12:25:24.752 project[1554:c07] Clean: 2013-09-10 06:55:15 +0000
Try this
NSString *strCurrentDate;
NSString *strNewDate;
NSDate *date = [NSDate date];
NSDateFormatter *df =[[NSDateFormatter alloc]init];
[df setDateStyle:NSDateFormatterMediumStyle];
[df setTimeStyle:NSDateFormatterMediumStyle];
strCurrentDate = [df stringFromDate:date];
NSLog(#"Current Date and Time: %#",strCurrentDate);
int hoursToAdd = 3;
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setHour:hoursToAdd];
NSDate *newDate= [calendar dateByAddingComponents:components toDate:date options:0];
[df setDateStyle:NSDateFormatterMediumStyle];
[df setTimeStyle:NSDateFormatterMediumStyle];
strNewDate = [df stringFromDate:newDate];
NSLog(#"New Date and Time: %#",strNewDate);
Output
Current Date and Time: Sep 10, 2013, 1:15:41 PM
New Date and Time: Sep 10, 2013, 4:15:41 PM
NSDate *CurrentTimedate = [NSDate date];
NSLog(#"%#",CurrentTimedate);
NSDate *newDate = [CurrentTimedate dateByAddingTimeInterval:60*60*3];
NSLog(#"%#",newDate);
NSDate *newDate = [oldDate dateByAddingTimeInterval:hrs*60*60];
Related
My concern is..if am having text field with start date.when i am selecting date from calendar with day of Friday..then i want to skip weekend days saturday and sunday in enddate text field...i tried like this
NSString *strCurrentDate;
NSString *strNewDate;
NSDate *date = [NSDate date];
NSDateFormatter *df =[[NSDateFormatter alloc] init];
[df setDateFormat:#"yyyy-MM-dd"];
[df setTimeStyle:NSDateFormatterMediumStyle];
strCurrentDate = [df stringFromDate:date];
NSLog(#"Current Date and Time: %#",strCurrentDate);
int hoursToAdd = roundedUp;
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:hoursToAdd];
NSDate *newDate= [calendar dateByAddingComponents:components toDate:date options:0];
[df setDateFormat:#"yyyy-MM-dd"];
[df setTimeStyle:NSDateFormatterMediumStyle];
strNewDate = [df stringFromDate:newDate];
NSLog(#"New Date and Time: %#",strNewDate);
while ([strNewDate compare:strCurrentDate] == NSOrderedAscending)
{
NSDateComponents *dateComponents = [calendar components:NSWeekdayCalendarUnit fromDate:strNewDate];
if (dateComponents.weekday == friday)
{
count = count+2;
NSLog(#"count = %d", count);
NSDateComponents *oneDay = [[NSDateComponents alloc] init];
[oneDay setDay:2];
NSString *endDate = [strNewDate dateByAddingTimeInterval:2*60*60*24];
// [oneDay setDay:2];
}
}
But I am not getting only week days… so can any one do the needful… thank u in advance :)
To get the next working day from now use the method isDateInWeekend of NSCalendar
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// Strip the time portion of the date
NSDate *date = [calendar startOfDayForDate:[NSDate date]];
do {
// add 1 day until the result is not in a weekend
date = [calendar dateByAddingUnit:NSCalendarUnitDay value:1 toDate:date options:NSCalendarMatchNextTime];
} while (![calendar isDateInWeekend:date]);
NSLog(#"Next Workday: %#", date);
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
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.
I'm struggling to find a way to use NSDate for time only purposes.
I was trying to do the following code:
- (void)awakeFromInsert
{
NSDateComponents *comps = [[NSDateComponents alloc] init];
comps.minute = 45;
comps.second = 0;
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
self.periodDuration = [calendar dateFromComponents:comps];
NSLog(#"periodDuration: %#",self.periodDuration);
comps = [[NSDateComponents alloc] init];
comps.hour = 8;
comps.minute = 0;
self.firstPeriodStartTime = [calendar dateFromComponents:comps];
NSLog(#"firstPeriodTime: %#",self.periodDuration);
}
But the result I get is:
periodDuration: 0001-12-31 22:24:04 +0000
firstPeriodTime: 0001-12-31 22:24:04 +0000
The result I was expecting:
periodDuration: 45:00
firstPeriodTime: 08:00
What am I doing wrong? How can I fix this?
Thank you.
The log of date is misleading you, if you are forming a date with only a few components you will not get a proper date instance which uniquely identifies a date and time.
If you try with this code snipped you can find that if you are just converting the dates back to string it is just as you expect
NSDateComponents *comps = [[NSDateComponents alloc] init];
comps.minute = 45;
comps.second = 0;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *periodDate = [calendar dateFromComponents:comps];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"mm:ss"];
NSLog(#"periodDuration: %#",[dateFormatter stringFromDate:periodDate]);
comps = [[NSDateComponents alloc] init];
comps.hour = 8;
comps.minute = 0;
NSDate *firstPeriodDate = [calendar dateFromComponents:comps];
[dateFormatter setDateFormat:#"HH:mm"];
NSLog(#"firstPeriodTime: %#",[dateFormatter stringFromDate:firstPeriodDate]);
periodDuration: 45:00
firstPeriodTime: 08:00
You can use NSDateFormatter
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"HH:mm"];
NSLog(#"%#",[dateFormatter stringFromDate:[NSDate date]]);
Use a NSTimeInterval (which is, basically, a double containing the number of seconds). To store it in CoreData:
[NSNumber numberWithDouble:myTimeInterval];
As for formatting: If you want more than 24h displayed, use this:
NSUInteger seconds = (NSUInteger)round(myTimeInterval);
NSString *formattedDate = [NSString stringWithFormat:#"%02u:%02u:%02u",
seconds / 3600, (seconds / 60) % 60, seconds % 60];
NSLog(#"%#", formattedDate);
If you don't want more than 24h, you can use NSDate and NSDateFormatter again:
NSDate *date = [NSDate dateWithTimeIntervalSinceReferenceDate:myTimeInterval];
NSDateFormatter *dateFormatter = [NSDateFormatter new];
[dateFormatter setDateFormat:#"HH:mm:ss"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
NSString *formattedDate = [dateFormatter stringFromDate:date];
NSLog(#"%#", formattedDate);
NSString *timeString;
timeString = [NSDateFormatter localizedStringFromDate:[NSDate date]
dateStyle:NSDateFormatterNoStyle
timeStyle:NSDateFormatterMediumStyle];
12:03:54 PM