Currently have a text input from users and which to add that to current time and display on the Screen as a text input in HH:mm format.
Current Code:-
NSString *strCurrentDate;
NSString *strNewDate;
NSDate *date = [NSDate date];
NSDateFormatter *df =[[NSDateFormatter alloc]init];
[df setDateFormat:#"hh:mm"];
strCurrentDate = [df stringFromDate:date];
NSLog(#"Current Time: %#",strCurrentDate);
int minutesToAdd = workingTime.text;
NSCalendar *calendar = [[NSCalendar
alloc]initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setMinute:minutesToAdd];
NSDate *newDate= [calendar dateByAddingComponents:components toDate:date options:0];
[df setDateFormat:#"hh:mm"];
strNewDate = [df stringFromDate:newDate];
NSLog(#"workingtime is :%#",workingTime.text);
NSLog(#"New Date and Time: %#",strNewDate);
crewOutTime.text = strNewDate;
However Add's incorrect amount to time When i Change it to int minutesToAdd = 40; to a fixed Value it is correct and works as wanted.
Try
int minutesToAdd = workingTime.text.intValue;
instead of
int minutesToAdd = workingTime.text;
With your code you are setting your minutesToAdd to a pointer.
Related
Here's an example of what I want. The user may set up an alarm in my app for 1 minute in the future, so they can test it out. The time might be 19:23, so they'll set the alarm to 19:24, in which case I want it to be triggered on the next occurrence of 19:24 - in 1 minute's time.
If they set the alarm for 8am, I don't want it to set to 8am on the current day, but on the next occurrence of 8am - on following day.
How can I get it to aim for the next occurrence of the time chosen?
Assuming that the alarm time is given as "hour" and "minute", the following code
should produce the desired result:
NSDate *now = [NSDate date];
// Example values for testing:
NSUInteger alarmHour = 10;
NSUInteger alarmMinute = 5;
// Compute alarm time by replacing hour/minute of the current time
// with the given values:
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *comp = [cal components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit
fromDate:now];
[comp setHour:alarmHour];
[comp setMinute:alarmMinute];
NSDate *alarm = [cal dateFromComponents:comp];
// If alarm <= now ...
if ([alarm compare:now] != NSOrderedDescending) {
// ... add one day:
NSDateComponents *oneDay = [[NSDateComponents alloc] init];
[oneDay setDay:1];
alarm = [cal dateByAddingComponents:oneDay toDate:alarm options:0];
}
More tersely, what #HotLicks suggests:
NSDate *userEnteredDate;
NSDate *now = [NSDate date];
if (now == [now laterDate:userEnteredDate]) {
NSDateComponents *components = [[NSCalendar currentCalendar] components:255 fromDate:userEnteredDate]; // 255= the important component masks or'd together
components.day += 1;
userEnteredDate = [[NSCalendar currentCalendar] dateFromComponents:components];
}
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
NSDateFormatter *formatter_ = [[NSDateFormatter alloc]init];
NSDate *alarmDate = [formatter dateFromString:#"enter your users alarm time-examle(2345)"];
NSDate *currentDate = [NSDate date];
[formatter setDateFormat:#"HHmm"];
NSDate *finalDate;
if ([[formatter stringFromDate:currentDate] intValue] > [[formatter stringFromDate:alarmDate] intValue]) {
[formatter setDateFormat:#"HH:mm"];
[formatter_ setDateFormat:#"dd MM yyyy"];
NSDate *date = [currentDate dateByAddingTimeInterval:60*60*24*1];
finalDate = [formatter_ dateFromString:[NSString stringWithFormat:#"%# %#",[formatter stringFromDate:alarmDate],[formatter_ stringFromDate:date]]];
}else{
finalDate = [formatter_ dateFromString:[NSString stringWithFormat:#"%# %#",[formatter stringFromDate:alarmDate],[formatter_ stringFromDate:currentDate]]];
}
I'm using Parse.com to store some values:
These are GMT values. How do I convert these to the device's current time zone and get NSDate as a result?
NSDate is always represented in GMT. It's just how you represent it that may change.
If you want to print the date to label.text, then convert it to a string using NSDateFormatter and [NSTimeZone localTimeZone], as follows:
NSString *gmtDateString = #"08/12/2013 21:01";
NSDateFormatter *df = [NSDateFormatter new];
[df setDateFormat:#"dd/MM/yyyy HH:mm"];
//Create the date assuming the given string is in GMT
df.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0];
NSDate *date = [df dateFromString:gmtDateString];
//Create a date string in the local timezone
df.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:[NSTimeZone localTimeZone].secondsFromGMT];
NSString *localDateString = [df stringFromDate:date];
NSLog(#"date = %#", localDateString);
// My local timezone is: Europe/London (GMT+01:00) offset 3600 (Daylight)
// prints out: date = 08/12/2013 22:01
The easiest method I've found is this:
NSDate *someDateInUTC = …;
NSTimeInterval timeZoneSeconds = [[NSTimeZone localTimeZone] secondsFromGMT];
NSDate *dateInLocalTimezone = [someDateInUTC dateByAddingTimeInterval:timeZoneSeconds];
This is a very clean way to change the NSDate to a local time zone date
extension NSDate {
func toLocalTime() -> NSDate {
let timeZone = NSTimeZone.local
let seconds : TimeInterval = Double(timeZone.secondsFromGMT(for:self as Date))
let localDate = NSDate(timeInterval: seconds, since: self as Date)
return localDate
}
}
taken from https://agilewarrior.wordpress.com/2012/06/27/how-to-convert-nsdate-to-different-time-zones/
Creating an Xcode test case like the following may help us remember the rules "forever":
- (void)test2015_05_23_07_07_07_Toronto {
NSString *utcDateString = #"2015_05_23 12:07:07";
NSDateFormatter *dateFormatter = [NSDateFormatter new];
dateFormatter.dateFormat = #"yyyy_MM_dd HH:mm:ss";
dateFormatter.timeZone = [NSTimeZone timeZoneWithName:#"UTC"];
NSDate *date2015_05_23_12_07_07_UTC = [dateFormatter dateFromString:utcDateString];
XCTAssertTrue([date2015_05_23_12_07_07_UTC.description isEqualToString:#"2015-05-23 12:07:07 +0000"]);
dateFormatter.timeZone = [NSTimeZone timeZoneWithName:#"EST"];
NSString *torontoDateString = [dateFormatter stringFromDate:date2015_05_23_12_07_07_UTC];
XCTAssertTrue([torontoDateString isEqualToString:#"2015_05_23 07:07:07"]);
// change format to add ZZZ
dateFormatter.dateFormat = #"yyyy_MM_dd HH:mm:ss ZZZ";
torontoDateString = [dateFormatter stringFromDate:date2015_05_23_12_07_07_UTC];
XCTAssertTrue([torontoDateString isEqualToString:#"2015_05_23 07:07:07 -0500"]);
XCTAssertEqual(1432382827, [date2015_05_23_12_07_07_UTC timeIntervalSince1970]);
NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
calendar.timeZone = [NSTimeZone timeZoneWithName:#"EST"];
NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond) fromDate:date2015_05_23_12_07_07_UTC];
XCTAssertEqual(2015, components.year);
XCTAssertEqual(5, components.month);
XCTAssertEqual(23, components.day);
XCTAssertEqual(7, components.hour);
XCTAssertEqual(7, components.minute);
XCTAssertEqual(7, components.second);
}
You could use a NSDateFormatter to achieve this result.
NSString *dateAsString = #"08/07/2013 04:06";
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"dd/MM/yyyy HH:mm"];
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:#"GMT"];
[df setTimeZone:gmt];
NSDate *myDate = [df dateFromString: dateAsString];
NSLog(#"date: %#", myDate);
There are many answers to this question but I would recommend this one:
Convert GMT NSDate to device's current Time Zone
NSString *dateStr = #"2012-07-16 07:33:01";
NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
[dateFormatter1 setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSDate *date = [dateFormatter1 dateFromString:dateStr];
NSLog(#"date : %#",date);
NSTimeZone *currentTimeZone = [NSTimeZone localTimeZone]; // <- Local time zone
NSTimeZone *utcTimeZone = [NSTimeZone timeZoneWithAbbreviation:#"UTC"];
NSInteger currentGMTOffset = [currentTimeZone secondsFromGMTForDate:date1];
NSInteger gmtOffset = [utcTimeZone secondsFromGMTForDate:date1];
NSTimeInterval gmtInterval = currentGMTOffset - gmtOffset;
NSDate *destinationDate = [[[NSDate alloc] initWithTimeInterval:gmtInterval sinceDate:date1] autorelease];
NSDateFormatter *dateFormatters = [[NSDateFormatter alloc] init];
[dateFormatters setDateFormat:#"dd-MMM-yyyy hh:mm"];
[dateFormatters setDateStyle:NSDateFormatterShortStyle];
[dateFormatters setTimeStyle:NSDateFormatterShortStyle];
[dateFormatters setDoesRelativeDateFormatting:YES];
[dateFormatters setTimeZone:[NSTimeZone systemTimeZone]];
dateStr = [dateFormatters stringFromDate: destinationDate];
NSLog(#"DateString : %#", dateStr);
I am facing problem while converting given date into system time zone in iOS.
Source date: 2013-03-18 03:54:18 // its in AM format
Destination date should be : 2013-03-18 03:30:15 //its in PM format.
How can I get this??
I have tried below code but getting wrong data and difference too.
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = #"yyyy-MM-dd HH:mm:ss";
NSLog(#"Post date::%#",postDate);
NSDate *utc = [fmt dateFromString:postDate];
fmt.timeZone = [NSTimeZone systemTimeZone];
NSString *local = [fmt stringFromDate:utc];
NSLog(#" local %#", local);
NSDate *date1 = [NSDate date];
NSString *currentDateString = [fmt stringFromDate:date1];
NSDate *currentDate = [fmt dateFromString:currentDateString];
NSUInteger flags = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
NSDateComponents *difference = [[NSCalendar currentCalendar] components:flags fromDate:utc toDate:currentDate options:0];
NSLog(#"difference::%d",[difference day]);
NSLog(#"difference::%d",[difference hour]);
NSLog(#"difference::%d",[difference minute]);
EDIT: Outputs
Post date::2013-03-18 03:20:09
local 2013-03-18 03:20:09
difference::0
difference::13
difference::2
Replace your code from...
fmt.timeZone = [NSTimeZone systemTimeZone];
as like this
fmt.timeZone = [NSTimeZone localTimeZone];
This will works for you...
NSString *openingHour = #"15:05:35 ";
NSDateFormatter *workingHoursFormatter = [[NSDateFormatter alloc] init];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:#"UTC"];
[workingHoursFormatter setTimeZone:timeZone];
[workingHoursFormatter setDateFormat:#"HH:mm"];
NSDate *openingTime = [workingHoursFormatter dateFromString:openingHour];
Can you try the above code it works for me , alter the date format to your need
How will I compare current time [NSDate date] with fixed time 05:00:00 PM.
That 05:00 PM is already passed or not. I just need BOOL check for this.
- (BOOL)past5pm
{
NSCalendar *gregorianCalender = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *components = [gregorianCalender components:NSHourCalendarUnit fromDate:[NSDate date]];
if([components hour] >= 17) // NSDateComponents uses the 24 hours format in which 17 is 5pm
return YES;
return NO;
}
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:#"HH.mm"];
NSDate *currentDate = [NSDate date];
NSString *curDate = [dateFormatter stringFromDate:currentDate];
if ([curDate doubleValue] >= 17.00)
{
//set your bool
}
Try this
NSDateFormatter* dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:#"hh:mm:ss a"];
NSDate* date = [NSDate date];
//Get the string date
NSString* str = [dateFormatter stringFromDate:date];
NSDate *firstDate = [dateFormatter dateFromString:#"05:00:00 PM"];
NSDate *secondDate = [dateFormatter dateFromString:str];
NSTimeInterval timeDifference = [secondDate timeIntervalSinceDate:firstDate];
NSLog(#"Time Diff - %f",timeDifference);
You can probably use plain C style code and get the difference as an integer and then decide what you need to return from the comparison function depending on wether the difference is positive or negative. You can compare minutes this way as well. Dont forget to import time.h.
time_t now = time(NULL);
struct tm oldCTime;
localtime_r(&now, &oldCTime);
int hours = oldCTime.tm_hour;
int diff = 17-hours;
NSLog(#"Time difference is: %d.", diff);
I have two strings both are in following date format (2011-03-22).
i have to compare them and find number of days between them.
Can anyone tell me how to do this..
Please also tell me the correct method to convert them back to NSDate.
Might be a couple of errors as i just typed this, but it speaks for itself and you should get the idea.
NSString *dateStringA = #"2011-03-22";
NSString *dateStringB = #"2011-03-27";
NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];
df.dateFormat = #"yyyy-MM-dd";
NSDate *dateA = [df dateFromString:dateStringA];
NSDate *dateB = [df dateFromString:dateStringB];
NSDateComponents *comps = [[NSCalendar currentCalendar] components:NSDayCalendarUnit fromDate:dateA toDate:dateB options:0];
int daysBetweenDates = comps.day; //This is your days between the 2 dates
NSDate *intervalDate = [[NSCalendar currentCalendar] dateFromComponents:comps]; //This date object represents the duration between them
For string to date
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyy-MM-dd HH:mm:ss ZZZ"];
NSDate *dateFromString = [[NSDate alloc] init];
dateFromString = [dateFormatter dateFromString:<NSString containing date>];
for date to string
NSString *date = [[NSDate date] description];