Is there a way to format time so that it shows up as
19-Oct-2015 3-6 PM? I know how to set day, month, year. I just need to know if it's possible to set the hours so that it shows a timeframe like 3pm-6pm or if I will just have to format the strings myself.
You will have to format at least the time portion yourself.
NSDateFormatter formats NSDate. NSDate is something which denotes single point in time. It seems like you want to define time with range ie. at least two different NSDates. So, it might not be possible to do that with only NSDateFormatter. If both date start date and end date lie on the same date, you could use NSDateFormatter to format time and then get components of hour for two different date, then compose the string to have it like you showed above.
Related
I am currently creating an app where I ask the user to input a time (through datePicker) and send the user a notification every day on that time.However, I noticed that datePicker only has an NSDate object, and was wondering if there was a Time object counterpart.Also, would this Time object be a good way of storing the time, or should I convert the hour and minutes to Integers for storage?
Thanks in advance!
NSDate also contains Time information within it. You can store the exact date and time using only NSDate.
NSDate is a generic representation independent of any time zone. According to the apple docs:
NSDate objects encapsulate a single point in time, independent of any particular calendrical system or time zone. Date objects are immutable, representing an invariant time interval relative to an absolute reference date (00:00:00 UTC on 1 January 2001)
NSDate is basically the number of seconds from the reference date mentioned above.
And yes NSDate is the best way for storing time and date information in your app.
Whenever you want to display the time, use NSDateFormatter to format the date and time into any format you desire and for any Time Zone you require.
Swift 3
The NSDate class has been renamed to Date in Swift 3
I'm trying to reproduce some of the functionality of the default Clock where I let users select a repeat frequency for an alarm. The problem is that different NSCalendar settings will give you different names for the days of the week. How do I store the selected days of the week in such a way that if the user changes their calendar the frequency always falls on the right day of the week?
One solution would be to check if the calendar has changed every time the app comes into foreground, and if so, make appropriate changes from there. Probably not the most elegant solution, nor the best practice, but it could get the job done.
Take (long) [dateYouWantToRemember timeIntervalSince1970] and store that in a property file or some such. (You could use timeIntervalSinceReferenceDate, but the 1970 number is the "UNIX epoch date" and more standardized -- you can find converters online to check it.)
Later, under the (potentially) different calendar, do [NSDate dateWithTimeIntervalSince1970:theLongYouStored] and you will reconstruct the date, in the new calendar.
Now use NSCalendar/NSDateComponents to find out the new ordinal day of week of that date, and use [NSDateFormatter weekdaySymbols] to fetch a list of the weekday names. Index the list with the ordinal to fetch the new day name. Use NSDateComponents to do arithmetic on you dates to select the next date that is that day of the week, as needed for your app.
In my program, I have an NSArray of various dates and times, stored as strings and formatted like this: #[#"07:23",#"18:09",#"13:55"];
When I use an NSDateFormatter to convert these to NSDates, the times are correct, but year/month/day information is added.
The arrays that I have created are columns of a bus schedule. Each entry is one timeslot for whatever stop the array represents. My application needs to take the current time: [NSDate date] and see which time from the array is next in sequence. I'm just trying to display when the very next bus will arrive.
I have thought of comparing each element of the array with the current date and time using -[NSDate's laterDate:], but the problem is that when I convert the strings to NSDate objects, it gives them some random day-month-year like 13:55:00 January 1st, 2001 which will always be before the current date, so my test won't work.
I can find some workarounds that are really tragically McGuyvered but I would prefer something clean.
What I want to know are these things:
Can I remove the day/month/year portion from the NSDate?
Is it possible to easily set the day/month/year of each object in my array to today without using NSDateComponents and NSCalendar? I can manipulate them as they enter the array.
Would it be easier to reformat the current date/time to match the day/month/year of the array?
Otherwise, is there a better, cleaner solution to find the next upcoming timeslot? I am open to changing the entire format from arrays if necessary.
Can I remove the day/month/year portion from the NSDate?
No. An NSDate is merely an instant in time that is some number of seconds since some reference date. Describing that instant in time as some year/month/day depends on the local calendar. For example, the "day of month" of [NSDate date] as I type this is 28 where I live but 29 for the same NSDate value in Japan.
Is it possible to easily set the day/month/year of each object in my
NSMutableArray to today? without using NSDateComponents and
NSCalendar?
No. That's what NSDateComponents is for.
Otherwise, is there a better, cleaner solution to find
the next upcoming timeslot? I am open to changing the entire format
from arrays if necessary.
Use NSCalendar's -components:fromDate: to get an NSDateComponents object that matches [NSDate date]. Replace the hour/minute/second components with an arrival time's hour/minute/second: this is an arrival time today. Add one to the day component: this is an arrival time tomorrow. (Weekend and holiday schedules cause extra complication; the weekday component may be useful.) Convert back to NSDate using NSCalendar's -dateFromComponents: and perform your date comparisons there.
I get current time or time stamp of some image. I have to change only date while the time should not be changed. For example I use [NSdate date] to get current date and time and store in an NSdate object that is "2014-01-10 09:58:47 +0000". Now change only the date part, keeping the time same as it is "2013-11-09 09:58:47 +0000"
How can I achieve that?
Convert the date into it's date components (which includes the time part), change the date part of the components to be for the new day, and create a new date based on these components.
dateByAddingDateComponents is also another way to do it.
It's all described in the Calendrical Calculations documentation.
I have a Time Picker and a Date Picker.
How to get the time included with the date in same NSDate?
I need the time between 2 dates (including time) How?
I have the code for getting time between dates, i just need help to include the time.
By default, a UIDatePicker is set to allow the user to choose a Date and a Time. The mode can be set to either Date, Time or Date and Time. As long as the mode of your UIDatePicker is set to Date and Time it will set both the date and time in the linked NSDate object.
If you really want to have two separate UIDatePickers, one set to Date and the other to Time then you will need to link them to two different NSDate objects and then have code behind to combine the two NSDates into a single NSDate using something like the code here Problem combining a date and a time into a single NSDate