i have one date like '2014-11-16T15:42:14' in server and now i want to convert this date into such formate like '1 day and 2 hours ago'.
can any body help me how can i solve this?
I wholeheartedly accept your down votes.(Please explain me the reason for you down vote such that i will not repeat my mistake).
Look at that example that will help you definately.
Copied From Here
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *date = [NSDate date];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setWeekOfYear:1];
[components setHour:12];
NSLog(#"1 week and twelve hours from now: %#", [calendar dateByAddingComponents:components toDate:date options:0]);
Related
I created an NSDate by dateFromComponents, using NSCalendar with NSGregorianCalendar identifier, here's the strange part:
The date get incorrect if it's before a certain point in time before 1900/12/31
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [[NSDateComponents alloc] init];
components.year = 1900; components.month = 12; components.day = 31;
NSDate *date = [calendar dateFromComponents:components];
components.year = 1901; components.month = 1; components.day = 1;
NSDate *date2 = [calendar dateFromComponents:components];
NSLog(#"%#",calendar.timeZone.description);
NSLog(#"%#",date);
NSLog(#"%#",date2);
The log will be:
2016-05-25 14:58:21.014 date[79754:2192157] Asia/Shanghai (GMT+8) offset 28800
2016-05-25 14:58:21.015 date[79754:2192157] 1900-12-30 15:54:17 +0000
2016-05-25 14:58:21.015 date[79754:2192157] 1900-12-31 16:00:00 +0000
As you can see, there is a 5 minutes gap during the day.
However, if I set the timeZone by [NSTimeZone timeZoneForSecondsFromGMT:], even with the same seconds deviation - 28800, it will be normal.
What is the cause of this?
No, the date isn't incorrect. Instead, the NSCalendar code knows things about calendars that you wouldn't dream about, like calendars changing their time offsets at some points in time in the past.
You asked for the Asia/Shanghai calendar to convert two dates, one on the day before they changed their time zone, one on the day after they changed their time zone, and both times are converted correctly. That night everyone in Shanghai had to adjust their watches.
Interesting question. What you are seeing is the effects of a time zone change from Local Mean Time to China Standard Time on 01-01-1901 when the clocks were turned back 05m43s.
More details here.
Try this!!
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setYear:1987];
[components setMonth:3];
[components setDay:17];
[components setHour:14];
[components setMinute:20];
[components setSecond:0];
NSDate *date = [calendar dateFromComponents:components];
Hope this Help:)
I want to get the current & next week dates with day name.
i.e. If today's date is 28-06-2013 (Friday) then I want to get the dates from 23-06-2013(sunday) to 29-06-2013 (Saturday) as the this current week.
for next week
I want to get dates from 30-06-2013(sunday) to 06-07-2013 (saturday).
How can I do this?
Thank you,
Here is sample code that does the trick.
-(NSArray*)daysThisWeek
{
return [self daysInWeek:0 fromDate:[NSDate date]];
}
-(NSArray*)daysNextWeek
{
return [self daysInWeek:1 fromDate:[NSDate date]];
}
-(NSArray*)daysInWeek:(int)weekOffset fromDate:(NSDate*)date
{
NSCalendar *calendar = [NSCalendar currentCalendar];
//ask for current week
NSDateComponents *comps = [[NSDateComponents alloc] init];
comps=[calendar components:NSWeekCalendarUnit|NSYearCalendarUnit fromDate:date];
//create date on week start
NSDate* weekstart=[calendar dateFromComponents:comps];
if (weekOffset>0) {
NSDateComponents* moveWeeks=[[NSDateComponents alloc] init];
moveWeeks.week=1;
weekstart=[calendar dateByAddingComponents:moveWeeks toDate:weekstart options:0];
}
//add 7 days
NSMutableArray* week=[NSMutableArray arrayWithCapacity:7];
for (int i=1; i<=7; i++) {
NSDateComponents *compsToAdd = [[NSDateComponents alloc] init];
compsToAdd.day=i;
NSDate *nextDate = [calendar dateByAddingComponents:compsToAdd toDate:weekstart options:0];
[week addObject:nextDate];
}
return [NSArray arrayWithArray:week];
}
I was going to copy and paste an answer, but I'd suggest going and reading this post: Current Week Start and End Date. It looks like it'll help you achieve what you want to.
Something like this perhaps:
NSDate *now = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger weekNumber = [[calendar components: NSWeekCalendarUnit fromDate:now] week];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comp = [gregorian components:NSYearCalendarUnit fromDate:now];
[comp setWeek:weekNumber]; //Week number.
int i;
for (i = 1; i < 8; i=i+1){
[comp setWeekday:i]; //First day of the week. Change it to 7 to get the last date of the week
NSDate *resultDate = [gregorian dateFromComponents:comp];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"EEEE MMMM d, yyyy"];
NSString *myDateString = [formatter stringFromDate:resultDate];
NSLog(#"%#",myDateString);
}
Use NSDateComponents to find out the day of the week and then to find the date required before and after it.
Umm, I'm not an expert on this or anything, but a dumb way to do this is to first be able to recognize the day of the week from NSDate. Then you could add in if statements then the if statements could add and subtract the dates and nslog or printf each of them. Or I think there is a way by accessing the ios calendar.
okay so the above pretty much said and did more than what I said. Yeah go check the link on the post before me.
Use an NSCalendar instance to convert your start NSDate instance into an NSDateComponents instance, add 1 day to the NSDateComponents and use the NSCalendar to convert that back to an NSDate instance. Repeat the last two steps until you reach your end date.
NSDate *currentDate = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:1];
NSDate *nextDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
Or else find start date and end date. like
NSDate *startDate = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:7];
NSDate *endDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
then,
NSDate nextDate;
for ( nextDate = startDate ; [nextDate compare:endDate] < 0 ; nextDate = [nextDate addTimeInterval:24*60*60] ) {
// use date
}
When my app is launched I want to check whether the date is between 9:00-18:00.
And I can get the time of now using NSDate. How can I check the time?
So many answers and so many flaws...
You can use NSDateFormatter in order to get an user-friendly string from a date. But it is a very bad idea to use that string for date comparisons!
Please ignore any answer to your question that involves using strings...
If you want to get information about a date's year, month, day, hour, minute, etc., you should use NSCalendar and NSDateComponents.
In order to check whether a date is between 9:00 and 18:00 you can do the following:
NSDate *date = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *dateComponents = [calendar components:NSHourCalendarUnit fromDate:date];
if (dateComponents.hour >= 9 && dateComponents.hour < 18) {
NSLog(#"Date is between 9:00 and 18:00.");
}
EDIT:
Whoops, using dateComponents.hour <= 18 will result in wrong results for dates like 18:01. dateComponents.hour < 18 is the way to go. ;)
Construct dates for 09:00 and 18:00 today and compare the current time with those dates:
NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *now = [NSDate date];
NSDateComponents *components = [cal components:NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
[components setHour:9];
[components setMinute:0];
[components setSecond:0];
NSDate *nineHundred = [cal dateFromComponents:components];
[components setHour:18];
NSDate *eighteenHundred = [cal dateFromComponents:components];
if ([nineHundred compare:now] != NSOrderedDescending &&
[eighteenHundred compare:now] != NSOrderedAscending)
{
NSLog(#"Date is between 09:00 and 18:00");
}
so in my app I want to subtract two dates. The first date is set date and the second one is the current date. So i tried this code:
NSString *setDateString = [NSString stringWithFormat:#"12:30"];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSDate *setDate = [dateFormatter dateFromString:setDateString];
NSTimeInterval interval = [[NSDate date] timeIntervalSinceDate:setDate];
But it counts the interval from 1970. But I need from the current day. Can anyone help?
I assume you want the difference between now and 1230 hrs of today. This can be done by
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components =[gregorian components:(NSDayCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit) fromDate:today];
[components setHour:12];
[components setMinute:30];
[components setSecond:0];
NSDate *setDate=[gregorian dateFromComponents:components];
NSTimeInterval interval = [[NSDate date] timeIntervalSinceDate:setDate];
[gregorian release];
The reason it doesn't work for you is you've not given the format correctly. Alternatively, you can describe it correctly in setDateString by specifying all the components rather than just hour and minute.
I know how to get the date in iOS. I need to find last weeks date. So for example if today is 05/27/2011, I need to be able to get 05/20/2011
Thanks
This is crude but would work:
NSDate *prevWeekDate = [currentDate dateByAddingTimeInterval:(-60 * 60 * 24 * 7)];
Click for detail on dateByAddingTimeInterval:
How about:
NSCalendar * calendar = [NSCalendar currentCalendar];
NSDate * date = [NSDate date];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setWeek:-1];
NSDate * lastweek = [calendar dateByAddingComponents:components toDate:date options:0];
NSLog(#"%#", lastweek);
[components release];