我创建了一个类别来帮助我处理从年、月、日字段创建日期。我现在还需要从 Julian Date (YYJJJ) 创建一个日期。我已经解析了我的 Julian 日期字符串,现在有了
int years // representing the year parsed from the julian date string
int days // representing the day of the year parsed from julian date string
这是我的 NSDateCategory:
#import "NSDateCategory.h"
@implementation NSDate (MBDateCat)
+ (NSDate *)dateWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day {
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
[components setYear:year];
[components setMonth:month];
[components setDay:day];
return [calendar dateFromComponents:components];
}
@end
如何从这些字段创建 NSDate?
编辑: 这是我试图翻译成Objective-C的Java功能
// Julian Exp Date
// (YYJJJ)
Date dt = new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(dt);
int years = new Integer(mid(data, 0, 2)).intValue();
int days = new Integer(mid(data, 2, 3)).intValue();
int year = ((cal.get(Calendar.YEAR) / 20) * 20) + years;
int month = 0;
int day = 0;
cal.set(year, month, day);
cal.add(Calendar.DAY_OF_YEAR, days);
myData.setDate(cal);