How to convert Date like “2012-12-26” to “december

问题:

I want to convert date 2012-12-26 to december 26, 2012 in iOS?

I am using websrvice and the data comes in this format 1990-12-26.

I want to change this to december 26, 2012 format.

This is what I am doing:

lbl_Rightside.text = [rootElement stringValueForNode:@"date"];
NSLog(@"lbl_Rightside is %@",lbl_Rightside.text);
[lbl_Rightside release];

Getting date to this label on 1990-12-26. Now I want to change date to december 26, 2012 format.

Any hints from experts would be very welcome.

回答1:

you can use NSDateFormatter to do this kind of things. First

1. convert your date String to a date object using dateFromString: method.
2. from date convert to string you want using stringFromDate: method

3. Different format strings can be found here.

   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
   [dateFormatter setDateFormat:@"yyyy-MM-dd"];
   NSDate *orignalDate   =  [dateFormatter dateFromString:YOUR_ORIGINAL_STRING];
   
   [dateFormatter setDateFormat:@"MMMM dd, yyyy"];
    NSString *finalString = [dateFormatter stringFromDate:orignalDate];
   
   [dateFormatter release]; //if not using ARC
   

回答2:

Check the official Apple documentation about NSDateFormatter. You should use this class to do this kind of formatting.

回答3:

by using NSDateFormatter

NSString to NSDate

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// this is imporant - we set our input date format to match our input string
// if format doesn't match you'll get nil from your string, so be careful
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSDate *dateFromString = [[NSDate alloc] init];
dateFromString = [dateFormatter dateFromString:dateString];
[dateFormatter release];

NSDate convert to NSString:

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"MMMM dd, yyyy"];
NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];
NSLog(@"%@", strDate);
[dateFormatter release];

回答4:

Try to look at NSDateFormatter Class,

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];  // this is your input date format
NSDate *newDate = [dateFormatter dateFromString:dateString];//converting string to date object

The format you are looking for is something like:

[dateFormatter setDateFormat:@"MMM dd,yyy"]; // setting new format
NSLog(@"The date is = %@",[dateFormatter stringFromDate:newDate])