I have searched for the solution to find the date of the sunday of the particular week.I have found questions that have been answered but it doesnt show the correct date of sunday.
NSCalendar *calendar = [NSCalendar currentCalendar];
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitWeekday | NSCalendarUnitWeekOfYear;
NSDateComponents *comps = [calendar components:unitFlags fromDate:[NSDate date]];
comps.weekday = 1; //Sunday
comps.weekOfMonth = 1;
NSDate *sundayDate = [calendar dateFromComponents:comps];
When i print out the date it gives this.
2015-07-08 10:14:00 +0000
Its the current date.What am i doing wrong?
hope this helps you :
NSDate *today = [NSDate date];
NSCalendar *calenderObj = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
calenderObj.firstWeekday = 1; // Sunday = 1,
// NSDateComponents *components = [calenderObj components:NSWeekOfYearCalendarUnit fromDate:today];
NSDate *objDate = nil;
[calenderObj rangeOfUnit:NSWeekCalendarUnit startDate:&objDate interval:NULL forDate:today];
NSLog(#" === %#", objDate);
Output :
=== 2015-07-15 10:26:00 +0000
Related
I am trying to set repeating notifications for every saturday and sunday but for some reason the date is coming out wrong.This is my code
NSCalendar *calendar = [NSCalendar currentCalendar];
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitWeekday | NSCalendarUnitWeekOfYear | NSCalendarUnitWeekOfMonth |NSCalendarUnitWeekOfMonth;
NSDateComponents *comps = [calendar components:unitFlags fromDate:[NSDate date]];
NSDateComponents *dt = [[NSDateComponents alloc]init];
comps.hour = hour;
comps.minute = [[goal.reminderTimeInfo valueForKey:#"minutes"] intValue];
[dt setMonth:[comps month]];
[dt setYear:[comps year]];
[dt setWeekOfMonth:[comps weekOfMonth]];
comps.weekday = 1; //Sunday
[dt setWeekday:[comps weekday]];
NSDate *sundayDate = [calendar dateFromComponents:dt];
Its suppose to give out
2015-07-05 19:00:00 +0000
but its giving
2015-07-04 19:00:00 +0000
And if give the local notification a particular date.For example its sunday.Will it fire every sunday?
You did not change the hour and the minutes for dt but for comps.
NSCalendar *calendar = [NSCalendar currentCalendar];
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitWeekday | NSCalendarUnitWeekOfYear | NSCalendarUnitWeekOfMonth |NSCalendarUnitWeekOfMonth;
NSDateComponents *comps = [calendar components:unitFlags fromDate:[NSDate date]];
NSDateComponents *dt = [[NSDateComponents alloc]init];
dt.hour = 19;
dt.minute = 00;
[dt setMonth:[comps month]];
[dt setYear:[comps year]];
[dt setWeekOfMonth:[comps weekOfMonth]];
[dt setWeekday:1];
NSDate *sundayDate = [calendar dateFromComponents:dt];
because NSDateformatter cannot use custom calendar, so for a calendar like:
NSCalendar *ISO8601 = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierISO8601];
[ISO8601 setMinimumDaysInFirstWeek:7];
[ISO8601 setFirstWeekday:2];
If we need the weekofYear,
This calendar will translate 2015-04-26 16:00:00 as 2015-16th week.
So I will get a string as 2015-16th week.
Then how can I convert string 2015-16th week to a correct NSDate or DateComponents, so if you convert this new NSDate or dateComponents, it will not loose the correctness?
- (NSDate *) dateByAddingWeeks:(NSInteger)dWeeks {
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [[NSDateComponents alloc] init];
NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitTimeZone;
components = [gregorian components:unitFlags fromDate:self];
components.day = components.day + 7 * dWeeks;
return [gregorian dateFromComponents:components];
}
Not sure.Are you looking for these kind of utility function?
I'm trying to set the month and year of [NSDate date] but the function dateFromComponents return the wrong value, this is my code:
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian]; // Setup an NSCalendar
NSDateComponents *components = [gregorianCalendar components: NSUIntegerMax fromDate: [NSDate date]]; // Setup NSDateComponents
[components setTimeZone:[NSTimeZone defaultTimeZone]];
[components setMonth:monthInt];
[components setYear:yearInt];
// Setup the new date
NSDate *dateToCompare = [gregorianCalendar dateFromComponents: components];
yearInt is 2014 and monthInt is 12, but it reports back 12-2015 and not 2014, why is this?
Thanks!
you need to put only the bit operator you need, try this:
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian]; // Setup an NSCalendar
NSDateComponents *components = [gregorianCalendar components: NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear |NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour | NSCalendarUnitTimeZone fromDate: [NSDate date]]; // Setup NSDateComponents
[components setTimeZone:[NSTimeZone defaultTimeZone]];
[components setMonth:12];
[components setYear:2014];
// Setup the new date
NSDate *dateToCompare = [gregorianCalendar dateFromComponents: components];
NSLog(#"Ver %#",dateToCompare);
NSUIntegerMax = 18446744073709551615
In bit representation: 10000000000000000000000000000000000000000000000000000000000000000
To many switch off.
I am working on a Calender app and it's working fine when i navigate to next month as i am able to get the last day of the month and from where i am able to get the first day of coming month .but when i navigate to previous month i m not able to get the last month's first day.Is there any way to get first day of last month.
The following works fine for me
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *currentDate = [NSDate date];
NSDateComponents *components = [calendar components:(NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:currentDate];
components.month = components.month - 1;
components.day = 1;
NSDate *newDate = [calendar dateFromComponents:components];
This also works if your current month is january. NSDateComponents will automatically decrement the year and set the month to december.
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear
fromDate:[NSDate date]];
components.day = 1;
components.month = components.month - 1;
NSDate *lastmonthDay1 = [[NSCalendar currentCalendar] dateFromComponents: components];
NSLog(#"First day of last month====: %#", [lastmonthDay1 descriptionWithLocale:[NSLocale currentLocale]]);
You can do something like below....
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
[gregorian setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"UTC"]];
NSDateComponents *comp = [gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:[NSDate date]];
[comp setDay:1];
[comp setMonth:CurrentMonth];//previous month
[comp setYear:currentYear];
NSDate *firstDayOfMonthDate = [gregorian dateFromComponents:comp];
NSCalendar *cal1=[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps1 = [cal1 components:NSWeekdayCalendarUnit fromDate:firstDayOfMonthDate];
// 1 for mon 8 for sun
int startWithDay=[comps1 weekday]==1?8:[comps1 weekday];
//1 for monday
// 2 for tuesday and so on....
Let me know it is working or not!!!
Happy Coding!!!!
I'm struggling to figure out how to dynamically create a date object for the most previous sunday at 12:00 AM
I was thinking I could get today's date and then subtract the current day of the week + 1 at which point I could just subtract the time of the day do get down to 12AM.
so far I have the current day of the week:
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps = [gregorian components:NSWeekdayCalendarUnit fromDate:[NSDate date]];
int weekday = [comps weekday];
at which point I can get today's date and subtract the difference of weekday * seconds in a day. However, how can I get today's time in seconds ??
No need to manually calculate seconds (which is dangerous anyway because of daylight saving etc.). The following should do exactly what you want:
NSDate *today = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
[calendar setLocale:[[NSLocale alloc] initWithLocaleIdentifier:#"en-US"]]; // force US locale, because other countries (e.g. the rest of the world) might use different weekday numbering
NSDateComponents *nowComponents = [calendar components:NSYearCalendarUnit | NSWeekCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:today];
[nowComponents setWeekday:1]; //Sunday
[nowComponents setHour:0]; // 12:00 AM = midnight (12:00 PM would be 12)
[nowComponents setMinute:0];
[nowComponents setSecond:0];
NSDate *previousSunday = [calendar dateFromComponents:nowComponents];
I'll leave worrying about transitions between daylight savings time to you:
NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date = [NSDate date];
NSLog(#"date %#", date);
NSDateComponents *componentsToday = [gregorian components:NSWeekdayCalendarUnit fromDate:date]; // NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit |
NSInteger days = componentsToday.weekday - 1;
NSLog(#"Days=%d", days);
NSDate *lastSunday = [date dateByAddingTimeInterval:-days*60*60*24];
NSLog(#"lastSunday %#", lastSunday);
NSDateComponents *componentsSunday = [gregorian components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:lastSunday];
[componentsSunday setHour:0];
[componentsSunday setMinute:0];
[componentsSunday setSecond:0];
NSDate *targetDate = [gregorian dateFromComponents:componentsSunday];
NSLog(#"TargetDate %#", targetDate);
#AndreasLey solution in Swift 2.0:
func getLastSunday() -> NSDate?
{
let today = NSDate();
let calendar : NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
calendar.locale = NSLocale(localeIdentifier: "en-US") // force US locale, because other countries (e.g. the rest of the world) might use different weekday numbering
let flags : NSCalendarUnit = [.Year , .Month, .Weekday, .WeekOfMonth, .Minute , .Second]
let nowComponents = calendar.components(flags, fromDate: today)
nowComponents.weekday = 1 //Sunday
nowComponents.hour = 0 // 12:00 AM = midnight (12:00 PM would be 12)
nowComponents.minute = 0
nowComponents.second = 0;
let previousSunday = calendar.dateFromComponents(nowComponents);
return previousSunday
}
This code is setting 12:00 am in your selected date from UIDatePicker.
NSDate *oldDateSelected = datePicker.date;
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDateSelected];
comps.hour = 00;
comps.minute = 00;
comps.second = 44;
NSDate *newDate = [calendar dateFromComponents:comps];
return newDate;