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【ObjC】字符串转化成NSDate类型

作者:格格巫2012 / 发布于2014/9/22/ 930

字符串转化成NSDate类型，计算与当前时间的相差，月数，天数


	NSString *dateStr=[dic objectForKey:@"date"];// 2014-01-01 11:23:23
	NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
	NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;
	NSDateFormatter *format=[[NSDateFormatter alloc] init];
	[format setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
	NSDate *fromdate=[format dateFromString:dateStr];
	NSTimeZone *fromzone = [NSTimeZone systemTimeZone];
	NSInteger frominterval = [fromzone secondsFromGMTForDate: fromdate];
	NSDate *fromDate = [fromdate dateByAddingTimeInterval: frominterval];
	NSLog(@"fromdate=%@",fromDate);
	[format release];
	NSDate *date = [NSDate date];
	NSTimeZone *zone = [NSTimeZone systemTimeZone];
	NSInteger interval = [zone secondsFromGMTForDate: date];
	NSDate *localeDate = [date dateByAddingTimeInterval: interval];
	NSLog(@"enddate=%@",localeDate);
	NSDateComponents *components = [gregorian components:unitFlags fromDate:fromDate toDate:localeDate options:0];
	NSInteger months = [components month];
	NSInteger days = [components day];//年[components year]
	NSLog(@"month=%d",months);
	NSLog(@"days=%d",days);
	[gregorian release];
	if (months==0&&days;==0) {
	 dateStr=[[dateStr substringFromIndex:11]substringToIndex:5];
	 cell.textLabel.text=[NSString stringWithFormat:@"今天 %@",dateStr];//今天 11:23
	}else if(months==0&&days;==1){
	 dateStr=[[dateStr substringFromIndex:11]substringToIndex:5];
	 cell.textLabel.text=[NSString stringWithFormat:@"昨天 %@",dateStr];//昨天 11:23
	}else{
	 dateStr=[dateStr substringToIndex:10];
	 cell.textLabel.text=dateStr;
	}

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