How to find out the current time in different timezone in xcode for an iphone application?
Suppose i'm in India and i want to know the current time in USA how do i get the time then.
Thanks in advance
Joy
See Introduction to Date and Time Programming Guide for Cocoa.
There are built-in methods for handling timezones.
Related
I'm looking at this wikipedia article:
http://en.wikipedia.org/wiki/Day_length
http://en.wikipedia.org/wiki/Sunrise_equation
Anybody had experience calculating Sunrise/Sunset times on iOS using the equations above with latitude given by the GPS?
I'm also interested in the Solar Noon. The idea is to create a clock in which the sun revolves around a fixed button, indicating time in a truly "analog" sense... The Sunrise/sunset times would then allow me to position the orbit of the "sun" around the button for a given day of the year, giving the impression of how much daylight time there will be, and how much has already expired.
Somehow iPhone adjusts brightness automatically, do you know if that is based on the ambient light via light sensor or some kind of calculation like the one that I'm trying to do above? Maybe there's already something out there that I can use?
Thank you, I'm sure this information will benefit not just me!
I found this source in C++, but am not sure how to integrate it into an existing Xcode project.
http://www.sci.fi/~benefon/rscalc_cpp.html
Here is a objective-c framework to calculate sunrise and sunset based on the location.
The iPhone adjusts its brightness by a sensor detecting ambient light.
I know that there is a method [NSDate date] which returns current date and time from iPhone clock. But if this clock time was changed manually it would rune my code.
Is there any opportunity to get world time, not current time from iPhone?
Yes, you can have correct current time by using ntp/sntp.
Following uris might help you to write your own implementation:
Simple NTP client for iOS : http://code.google.com/p/ios-ntp/
NSDate from time server: http://pathoneycutt.com/2010/12/nsdate-from-time-server/
I have a small query, i m developing a calendar application for the iPhone,but i have stuck at a certain point, In xcode there is only a data-picker and this element is not functional in my app because in my app the user must be fast to choose date time. I would to use another instrument for chose a date.
Hey guys please help me.....
I'm not sure I understand your question, but it sounds like you need a way for the user to pick a date/time? Have you seen UIDatePicker?
From your question I can't exactly see what the problem is... the SDK includes UIDatePicker, which you can configure to allow picking the date and time.
after i get current device time by using [NSDate date], how do i know it's daytime or night now?
thanks in advance!
To be absolutely certain, I'd use a weather API like Yahoo's weather. Send the current location to the API, and you'll get back some data that contains the sunset and sunrise times for that area.
If the current time is past the sunset time... blammo.
I want sync data from iphone to the webs server. My question is how can I know which data is new? the only way I see this is by making a datafield for each record on the server and the iPhone, but how about if the Iphone user is in a different timezone or his datetime is different from the server datetime.
Store all of your dates in GMT on both the server and device. There are several methods for getting GMT easily in Objective-C. The device will determine time-zone based on location. If you need to convert to local time, you can get the date by using the NSTimeZoneClass:
[NSDate dateWithTimeIntervalSinceNow:[[NSTimeZone defaultTimeZone] secondsFromGMT]]
Check out the docs on Date and Time Programming for additional assistance.