NSDateFormatter - 模拟器与硬件上的星期几不同

发布于 2024-10-28 13:07:40 字数 895 浏览 3 评论 0原文

我正在尝试确定我的应用程序中的当前日期。为此，我需要执行以下操作：

NSDateFormatter* dayDateFormatter = [[NSDateFormatter alloc] init];
[dayDateFormatter setDateFormat:@"e"];
int todayDayNum = [[dayDateFormatter stringFromDate:[NSDate date]] intValue];
[dayDateFormatter release];
NSLog(@"%d", todayDayNum);

今天对我来说目前是星期四，在我的 iPhone 上，我得到的结果是值 4。然而，在模拟器上我得到5。

我做错了什么吗？我已尝试使用 c 和 e 作为格式字符串。我还仔细检查了模拟器和设备上的日期/时间是否正确（并且相同）。

编辑：我已将代码更改为以下内容，现在似乎可以一致地工作（我的设备和模拟器都得到5。我猜测这是因为我的设备正在使用其他日历？

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *weekdayComponents = [gregorian components:(NSWeekdayCalendarUnit) fromDate:[NSDate date]];
NSInteger todayDayNum = [weekdayComponents weekday];
NSLog(@"%d", todayDayNum);

原文

I'm trying to determine the current day of the week in my app. To do this I have:

NSDateFormatter* dayDateFormatter = [[NSDateFormatter alloc] init];
[dayDateFormatter setDateFormat:@"e"];
int todayDayNum = [[dayDateFormatter stringFromDate:[NSDate date]] intValue];
[dayDateFormatter release];
NSLog(@"%d", todayDayNum);

Today is currently a Thursday for me, and on my iPhone I am getting the value 4 as the result. However, on the simulator I get 5.

Is there something I am doing wrong? I have tried both c and e as the format string. I have also double checked that the date/time is correct (and the same) on both the simulator and the device.

Edit: I've changed my code to the following, which seems to work consistently now (I get 5 for both my device and the simulator. I am guessing that this is because my device is using some other calendar?

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *weekdayComponents = [gregorian components:(NSWeekdayCalendarUnit) fromDate:[NSDate date]];
NSInteger todayDayNum = [weekdayComponents weekday];
NSLog(@"%d", todayDayNum);

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