I'm working with local notification. I got the notifications working. But I'm struggling with setting the correct date.
Let me first sketch the situation. I am making a festival app. This festival is on the 28-29-30 JUNE. Every artist object has an art_day. This can be 1 - 2 or 3.
1 --> 28 JUNE
2 --> 29 JUNE
3 --> 30 JUNE
I want a local notification 15 min before the start time of the artist. So this is how I'm making my fireDate of the notification.
-(NSDate *)getDateForArtist:(Artists *)artist{
int day = [artist.art_day intValue];
int timeStart = [artist.art_timestart intValue];
NSString *timeStart2 = [self getTimeStamp:artist.art_timestart];
int hours = [[timeStart2 substringWithRange:NSMakeRange(0,2)]intValue];
int minutes = [[timeStart2 substringWithRange:NSMakeRange(2,2)]intValue];
//in my db timeStart looks like 1530 --> 15h30 (I know bad db structure!!!)
int day2;
if(day == 1){
NSLog(#"day is 28");
day2 = 28;
}else if (day == 2){
NSLog(#"day is 29");
day2 = 29;
}else{
NSLog(#"day is 30");
day2 = 30;
}
NSDateComponents *comps = [[NSDateComponents alloc] init];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:#"GMT"];
[comps setTimeZone:timeZone];
[comps setDay:day2];
[comps setMonth:06];
[comps setYear:2013];
[comps setHour:hours];
[comps setMinute:minutes];
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date = [gregorian dateFromComponents:comps];
NSLog(#"date is %#",date);
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setMinute:-15];
NSDate *date2 = [gregorian dateByAddingComponents:offsetComponents toDate:date options:0];
NSLog(#"date -15 min %#", date2);
return date2;
}
This is how I create my notification
UIApplication* app = [UIApplication sharedApplication];
UILocalNotification* notifyAlarm = [[UILocalNotification alloc]
init];
if (notifyAlarm)
{
NSDate *datePush = [self getDateForArtist:artist];
NSLog(#"artist plays on: %# on hour %#",artist.art_day,artist.art_timestart);
NSLog(#"Push notification should send on: %#",datePush);
notifyAlarm.fireDate = datePush;
NSDictionary *dicNotification = [[NSDictionary alloc]initWithObjectsAndKeys:artist.art_id,#"pushKey", nil];
notifyAlarm.userInfo = dicNotification;
notifyAlarm.timeZone = [NSTimeZone defaultTimeZone];
notifyAlarm.repeatInterval = 0;
notifyAlarm.soundName = #"Glass.aiff";
notifyAlarm.alertBody = [NSString stringWithFormat:#"%# starts in 15 minutes",artist.art_name];
[app scheduleLocalNotification:notifyAlarm];
NSLog(#"Added");
}
But for some reason I don't get any push notification. Or I think that the date is not correct.
This is what I get from my logs
2013-06-29 15:37:17.801 genkonstage[14120:907] artist plays on day: 2 on hour 2020
2013-06-29 15:37:17.803 genkonstage[14120:907] Push notification should send on: 2013-06-29 20:05:00 +0000
Can anybody help me with this?
I'm working on a calendar app.
For a month I loop on all my day to get events of this day. I have to do this to handle recurent events and events longer than one day.
It work great except for one case: the last day of a several day long event. I see the event for the other days of this event but not for the last one. (I'm in GMT+1 Time Zone, that's why I have this hours)
SEARCH FOR THE LAST DAY OF EVENT
Start: 2013-03-25 23:00:00 +0000
End: 2013-03-26 22:59:59 +0000
EVENT
Start: 2013-03-24 21:00:06 +0000
End: 2013-03-26 21:00:06 +0000
No results!
Here is the method returning events for the day:
+ (NSArray *)ekEventsWithStartDate:(NSDate*)startDate endDate:(NSDate*)endDate
{
NSLog(#"ekEventsWithStartDate:%# endDate:%#",startDate,endDate);
NSPredicate *predicate = [_eventStore predicateForEventsWithStartDate:startDate
endDate:endDate
calendars:nil];
NSArray *events = [_eventStore eventsMatchingPredicate:predicate];
NSLog(#"events (%d):%#",[events count],events);
return events;
}
Here is the event details:
EKEvent <0xb0635e0> {EKEvent <0xb0635e0>
{title = 24-26 Mars 10 PM;
location = ;
calendar = EKCalendar <0xb3c3c80> {title = Calendar; type = Local; allowsModify = YES; color = #0E61B9;};
alarms = (null);
URL = (null);
lastModified = 2013-03-19 22:11:10 +0000;
timeZone = Europe/Paris (GMT+01:00) offset 3600};
location = ;
startDate = 2013-03-24 21:00:06 +0000;
endDate = 2013-03-26 21:00:06 +0000;
allDay = 0;
floating = 0;
recurrence = (null);
attendees = (null)}
Here is the log for the 3 days of this event from ekEventsWithStartDate method:
ekEventsWithStartDate:2013-03-23 23:00:00 +0000 endDate:2013-03-24 22:59:59 +0000
events (1):(
"EKEvent <0x9b44c00> {EKEvent <0x9b44c00> {title = 24-26 Mars 10 PM; location = ; calendar = EKCalendar <0xb336870> {title = Calendar; type = Local; allowsModify = YES; color = #0E61B9;}; alarms = (null); URL = (null); lastModified = 2013-03-19 22:11:10 +0000; timeZone = Europe/Paris (GMT+01:00) offset 3600}; location = ; startDate = 2013-03-24 21:00:06 +0000; endDate = 2013-03-26 21:00:06 +0000; allDay = 0; floating = 0; recurrence = (null); attendees = (null)}"
)
ekEventsWithStartDate:2013-03-24 23:00:00 +0000 endDate:2013-03-25 22:59:59 +0000
events (1):(
"EKEvent <0xb28b970> {EKEvent <0xb28b970> {title = 24-26 Mars 10 PM; location = ; calendar = EKCalendar <0xb336870> {title = Calendar; type = Local; allowsModify = YES; color = #0E61B9;}; alarms = (null); URL = (null); lastModified = 2013-03-19 22:11:10 +0000; timeZone = Europe/Paris (GMT+01:00) offset 3600}; location = ; startDate = 2013-03-24 21:00:06 +0000; endDate = 2013-03-26 21:00:06 +0000; allDay = 0; floating = 0; recurrence = (null); attendees = (null)}"
)
ekEventsWithStartDate:2013-03-25 23:00:00 +0000 endDate:2013-03-26 22:59:59 +0000
events (0):(null)
Why the method return null array?
Subsidiary question: is there a better way to get events for each days of a month? I'm looking for better performances.
Thank you for your help!
Edit 20/03/2013:
I figure out thanks to Dhruvik that my code works perfectly for iOS 5.X but doesn't work for iOS 6.X (no test for 4.X).
I check events and dates for 5.X and 6.X version and the only difference I saw is in event calendar timezone property:
iOS 5.X
timeZone = Europe/Paris (CET)
iOS 6.X
timeZone = Europe/Paris (UTC+01:00)
This problem doesn't concern full day events.
Do you have same problem with iOS 6.X?
Here is the code to fecth Event, which i've implemented in my app..
in .h
#property (nonatomic, retain) EKEventStore *eventStore;
#property (nonatomic, retain) EKCalendar *defaultCalendar;
#property (nonatomic, retain) NSMutableArray *eventsList;
in .m
//This code will fecth the events from one day Before the current date..
- (void) fetchevents
{
eventStore = [[EKEventStore alloc] init];
eventsList = [[NSMutableArray alloc] init];
EKEventStore *store = [[EKEventStore alloc] init];
[store requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
// handle access here
}];
// Get the appropriate calendar
NSCalendar *calendar = [NSCalendar currentCalendar];
// Create the start date components
NSDateComponents *oneDayAgoComponents = [[NSDateComponents alloc] init];
oneDayAgoComponents.day = -1; // From which date you have to fetch Events from calander, as per your need subtract the days from current date
NSDate *oneDayAgo = [calendar dateByAddingComponents:oneDayAgoComponents
toDate:[NSDate date]
options:0];
NSLog(#"%#", oneDayAgo);
// Create the end date components
NSDateComponents *oneYearFromNowComponents = [[NSDateComponents alloc] init];
oneYearFromNowComponents.year = 0;
NSDate *oneYearFromNow = [calendar dateByAddingComponents:oneYearFromNowComponents
toDate:[NSDate date]
options:0];
NSLog(#"%#", oneYearFromNow);
//Create the predicate from the event store's instance method
NSPredicate *predicate = [store predicateForEventsWithStartDate:oneDayAgo endDate:oneYearFromNow calendars:nil];
NSArray *events_Array = [eventStore eventsMatchingPredicate: predicate];
for (EKEvent *eventToCheck in events_Array)
{
[eventsList addObject:eventToCheck.title ];
}
}
Hope it helps., Happy coding.. Thanks
I would like to create an NSDate object that represents the next day that matches a NSString day.
For example. The NSString is MON or Monday I want to get the next NSDate that matches this day - it can be today aswell.
e.g.: NSString day = #"Tues";
result = 30 Aug
NSInteger desiredWeekday = 3; // Tuesday
NSRange weekDateRange = [[NSCalendar currentCalendar] maximumRangeOfUnit:NSWeekdayCalendarUnit];
NSInteger daysInWeek = weekDateRange.length - weekDateRange.location + 1;;
NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:[NSDate date]];
NSInteger currentWeekday = dateComponents.weekday;
NSInteger differenceDays = (desiredWeekday - currentWeekday + daysInWeek) % daysInWeek;
NSDateComponents *daysComponents = [[NSDateComponents alloc] init];
daysComponents.day = differenceDays;
NSDate *newDate = [[NSCalendar currentCalendar] dateByAddingComponents:daysComponents toDate:[NSDate date] options:0];
NSLog(#"newDate: %#", newDate);
2011-08-30 18:42:09.443 Test[63789:707] newDate: 2011-09-05 22:42:09 +0000
is there any way to create events for NSDate ? here is my code
NSDate *date = [NSDate date];
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:#"MMMM d, yyyy"];
NSString *dateStr = [dateFormatter stringFromDate:date];
myDate.text = dateStr;
for example if date = 12 FEB ;
myDate .text = #"Mother Day";
something like this
sure it is. You have to split the date into day and month using NSDateComponents
You could write a method like this:
- (BOOL)date:(NSDate *)date isSameAsDay:(NSInteger)day andMonth:(NSInteger)month {
NSUInteger dateFlags = NSDayCalendarUnit | NSMonthCalendarUnit;
NSDateComponents *components = [[NSCalendar currentCalendar] components:dateFlags fromDate:date];
if ([components day] == day && [components month] == month) {
return YES;
}
return NO;
}
and you would use it like this
if ([self date:[NSDate date] isSameAsDay:12 andMonth:2]) {
myDate.text = #"Mother Day";
}
This should do it:
NSDate *today = [NSDate date]; // Get ref to todays date
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *weekdayComponents =
[gregorian components:(NSWeekdayOrdinalCalendarUnit | NSWeekdayCalendarUnit | NSMonthCalendarUnit) fromDate:today];
NSInteger weekday = [weekdayComponents weekday]; // Sun == 1, Mon == 2, Tue...
NSInteger weekdayOrdinal = [weekdayComponents weekdayOrdinal]; // First weekday month == 1 etc...
NSInteger month = [weekdayComponents month];
NSLog (#"%i %i %i", weekday, weekdayOrdinal, month);
// Mothers day is every second Sunday of May so weekday == 1, weekdayOrdinal == 2, month == 5
if ((weekday == 1) && (weekdayOrdinal == 2) && (month == 5)) {
NSLog (#"It's mothers day!");
}
[gregorian release];
I have a time interval that spans years and I want all the time components from year down to seconds.
My first thought is to integer divide the time interval by seconds in a year, subtract that from a running total of seconds, divide that by seconds in a month, subtract that from the running total and so on.
That just seems convoluted and I've read that whenever you are doing something that looks convoluted, there is probably a built-in method.
Is there?
I integrated Alex's 2nd method into my code.
It's in a method called by a UIDatePicker in my interface.
NSDate *now = [NSDate date];
NSDate *then = self.datePicker.date;
NSTimeInterval howLong = [now timeIntervalSinceDate:then];
NSDate *date = [NSDate dateWithTimeIntervalSince1970:howLong];
NSString *dateStr = [date description];
const char *dateStrPtr = [dateStr UTF8String];
int year, month, day, hour, minute, sec;
sscanf(dateStrPtr, "%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &minute, &sec);
year -= 1970;
NSLog(#"%d years\n%d months\n%d days\n%d hours\n%d minutes\n%d seconds", year, month, day, hour, minute, sec);
When I set the date picker to a date 1 year and 1 day in the past, I get:
1 years 1 months 1 days 16 hours 0
minutes 20 seconds
which is 1 month and 16 hours off. If I set the date picker to 1 day in the past, I am off by the same amount.
Update: I have an app that calculates your age in years, given your birthday (set from a UIDatePicker), yet it was often off. This proves there was an inaccuracy, but I can't figure out where it comes from, can you?
Brief Description
Just another approach to complete the answer of JBRWilkinson but adding some code. It can also offers a solution to Alex Reynolds's comment.
Use NSCalendar method:
(NSDateComponents *)components:(NSUInteger)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSUInteger)opts
"Returns, as an NSDateComponents object using specified components, the difference between two supplied dates". (From the API documentation).
Create 2 NSDate whose difference is the NSTimeInterval you want to break down. (If your NSTimeInterval comes from comparing 2 NSDate you don't need to do this step, and you don't even need the NSTimeInterval, just apply the dates to the NSCalendar method).
Get your quotes from NSDateComponents
Sample Code
// The time interval
NSTimeInterval theTimeInterval = ...;
// Get the system calendar
NSCalendar *sysCalendar = [NSCalendar currentCalendar];
// Create the NSDates
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [[NSDate alloc] initWithTimeInterval:theTimeInterval sinceDate:date1];
// Get conversion to months, days, hours, minutes
NSCalendarUnit unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;
NSDateComponents *breakdownInfo = [sysCalendar components:unitFlags fromDate:date1 toDate:date2 options:0];
NSLog(#"Break down: %i min : %i hours : %i days : %i months", [breakdownInfo minute], [breakdownInfo hour], [breakdownInfo day], [breakdownInfo month]);
This code is aware of day light saving times and other possible nasty things.
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorianCalendar components: (NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit )
fromDate:startDate
toDate:[NSDate date]
options:0];
NSLog(#"%ld", [components year]);
NSLog(#"%ld", [components month]);
NSLog(#"%ld", [components day]);
NSLog(#"%ld", [components hour]);
NSLog(#"%ld", [components minute]);
NSLog(#"%ld", [components second]);
From iOS8 and above you can use NSDateComponentsFormatter
It has methods to convert time difference in user friendly formatted string.
NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
formatter.unitsStyle = NSDateComponentsFormatterUnitsStyleFull;
NSLog(#"%#", [formatter stringFromTimeInterval:1623452]);
This gives the output - 2 weeks, 4 days, 18 hours, 57 minutes, 32 seconds
Convert your interval into an NSDate using +dateWithIntervalSince1970, get the date components out of that using NSCalendar's -componentsFromDate method.
SDK Reference
This works for me:
float *lenghInSeconds = 2345.234513;
NSDate *date = [NSDate dateWithTimeIntervalSinceReferenceDate:lenghInSeconds];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
[formatter setDateFormat:#"HH:mm:ss"];
NSLog(#"%#", [formatter stringFromDate:date]);
[formatter release];
The main difference here is that you need to adjust for the timezone.
Or there is my class method. It doesn't handle years, but that could easily be addedn though it's better for small timelaps like days, hours and minutes. It take plurals into account and only shows what's needed:
+(NSString *)TimeRemainingUntilDate:(NSDate *)date {
NSTimeInterval interval = [date timeIntervalSinceNow];
NSString * timeRemaining = nil;
if (interval > 0) {
div_t d = div(interval, 86400);
int day = d.quot;
div_t h = div(d.rem, 3600);
int hour = h.quot;
div_t m = div(h.rem, 60);
int min = m.quot;
NSString * nbday = nil;
if(day > 1)
nbday = #"days";
else if(day == 1)
nbday = #"day";
else
nbday = #"";
NSString * nbhour = nil;
if(hour > 1)
nbhour = #"hours";
else if (hour == 1)
nbhour = #"hour";
else
nbhour = #"";
NSString * nbmin = nil;
if(min > 1)
nbmin = #"mins";
else
nbmin = #"min";
timeRemaining = [NSString stringWithFormat:#"%#%# %#%# %#%#",day ? [NSNumber numberWithInt:day] : #"",nbday,hour ? [NSNumber numberWithInt:hour] : #"",nbhour,min ? [NSNumber numberWithInt:min] : #"00",nbmin];
}
else
timeRemaining = #"Over";
return timeRemaining;
}
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];
// format: YYYY-MM-DD HH:MM:SS ±HHMM
NSString *dateStr = [date description];
NSRange range;
// year
range.location = 0;
range.length = 4;
NSString *yearStr = [dateStr substringWithRange:range];
int year = [yearStr intValue] - 1970;
// month
range.location = 5;
range.length = 2;
NSString *monthStr = [dateStr substringWithRange:range];
int month = [monthStr intValue];
// day, etc.
...
- (NSString *)convertTimeFromSeconds:(NSString *)seconds {
// Return variable.
NSString *result = #"";
// Int variables for calculation.
int secs = [seconds intValue];
int tempHour = 0;
int tempMinute = 0;
int tempSecond = 0;
NSString *hour = #"";
NSString *minute = #"";
NSString *second = #"";
// Convert the seconds to hours, minutes and seconds.
tempHour = secs / 3600;
tempMinute = secs / 60 - tempHour * 60;
tempSecond = secs - (tempHour * 3600 + tempMinute * 60);
hour = [[NSNumber numberWithInt:tempHour] stringValue];
minute = [[NSNumber numberWithInt:tempMinute] stringValue];
second = [[NSNumber numberWithInt:tempSecond] stringValue];
// Make time look like 00:00:00 and not 0:0:0
if (tempHour < 10) {
hour = [#"0" stringByAppendingString:hour];
}
if (tempMinute < 10) {
minute = [#"0" stringByAppendingString:minute];
}
if (tempSecond < 10) {
second = [#"0" stringByAppendingString:second];
}
if (tempHour == 0) {
NSLog(#"Result of Time Conversion: %#:%#", minute, second);
result = [NSString stringWithFormat:#"%#:%#", minute, second];
} else {
NSLog(#"Result of Time Conversion: %#:%#:%#", hour, minute, second);
result = [NSString stringWithFormat:#"%#:%#:%#",hour, minute, second];
}
return result;
}
Here's another possibility, somewhat cleaner:
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];
NSString *dateStr = [date description];
const char *dateStrPtr = [dateStr UTF8String];
// format: YYYY-MM-DD HH:MM:SS ±HHMM
int year, month, day, hour, minutes, seconds;
sscanf(dateStrPtr, "%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &minutes, &seconds);
year -= 1970;