CODEWITHSUNDEEP
objective-cioscocoa-touch
Sharon Watinsan
Sharon Watinsan

Reputation: 9850

current Date and Time - NSDate

I need to display the current Date and Time.

I have used ;

NSDate *currentDateNTime        = [NSDate date];

I want to have the current date and time (Should display the system time and not GMT time). The output should be in a NSDate format and not NSString.

for example;

    NSDate *currentDateNTime        = [NSDate date];
// Do the processing....

NSDate *nowDateAndTime = .....; // Output should be a NSDate and not a NSString

Upvotes: 8

Views: 22488

Answers (5)

ReaddyEddy
ReaddyEddy

Reputation: 339

Worth reading Does [NSDate date] return the local date and time?

Some useful resources for anyone coming to this more recently:

Apple date and time programming guide do read it if you're doing anything serious with dates and times. https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/DatesAndTimes/DatesAndTimes.html#//apple_ref/doc/uid/10000039i?language=objc

Useful category on NSDate with lots of utilities does allow a ~new~ date to be generated based on an existing date. https://github.com/erica/NSDate-Extensions

There's also a swift version of the category https://github.com/erica/SwiftDates

Upvotes: 1

lu yuan
lu yuan

Reputation: 7227

You need an NSDateFormatter and call stringFromDate this method to get a string of your date.

NSDateFormatter *dateformater = [[NSDateFormatter alloc] init];
[dateformater setDateFormat:@"yyyyMMdd,HH:mm"];
NSString *str = [dateformater stringFromDate: currentDateNTime];

Upvotes: 0

vikingosegundo
vikingosegundo

Reputation: 52227

Every moment in time is the same moment in time everywhere around the world —- it is just expressed as different clock times in different timezones. Therefore, you can't change the date to some other date that represents the time in your timezone; you must use an NSDateFormatter that you feed with the timezone you are in. The resulting string is the moment in time expressed in the clock time of your position.

Do all needed calculations in GMT, and just use a formatter for displaying.

Upvotes: 5

Nilesh Kikani
Nilesh Kikani

Reputation: 2618

use this method

-(NSDate *)convertDateToDate:(NSDate *) date
{
    NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
    NSDate *nowDate = [[[NSDate alloc] init] autorelease];
    [formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    [formatter setDateFormat:@"yyyy-MM-d H:m:s"];
    NSString * strdate = [formatter stringFromDate:date];
    nowDate = [formatter dateFromString:strdate];
    return nowDate;
}

this may return you what you want.

i hope you this may help you.

Upvotes: -1

Giorgio Marziani de Paolis
Giorgio Marziani de Paolis

Reputation: 1561

Since all NSDate is GMT referred, you probably want this: (don'f forget that the nowDate won't be the actual current system date-time, but it's "shifted", so if you will generate NSString using NSDateFormatter, you will see a wrong date)

NSDate* currentDate = [NSDate date];
NSTimeZone* currentTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
NSTimeZone* nowTimeZone = [NSTimeZone systemTimeZone];

NSInteger currentGMTOffset = [currentTimeZone secondsFromGMTForDate:currentDate];
NSInteger nowGMTOffset = [nowTimeZone secondsFromGMTForDate:currentDate];

NSTimeInterval interval = nowGMTOffset - currentGMTOffset;
NSDate* nowDate = [[NSDate alloc] initWithTimeInterval:interval sinceDate:currentDate];

Upvotes: 11

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