將字符串格式化爲常規時間不是軍事

Question

我想將字符串格式化爲常規時間而不是軍事時間。我將如何做到這一點。

if ([components hour] == 0 && 
     [components minute] == 0 && 
     [components second] == 0){ 

     result.detailTextLabel.text = 
     [NSString stringWithFormat: 
     @"%02ld/%02ld/%02ld - %02ld/%02ld/%02ld All Day", 
     (long)[components month], 
     (long)[components day], 
     (long)[components year], 
     (long)[components1 month], 
     (long)[components1 day], 
     (long)[components1 year]]; 

    } else { 
     result.detailTextLabel.text = 
     [NSString stringWithFormat: 
     @"%02ld/%02ld/%02ld at %02ld:%02ld - %02ld:%02ld", 

     (long)[components month], 
     (long)[components day], 
     (long)[components year], 
     (long)[components hour], 
     (long)[components minute], 
     (long)[components1 hour], 
     (long)[components1 minute]]; 

    } 

Answer 1

NSDateComponents *components = /* ... */; 
NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar] autorelease]; 
NSDate *date = [calendar dateFromComponents: components]; 
NSString *string = [NSDateFormatter localizedStringFromDate: date dateStyle: NSDateFormatterNoStyle timeStyle: NSDateFormatterShortStyle]; 

這很簡單，它自動本地化結果字符串。

Answer 2

這是正確的方法。它會根據用戶的語言環境和偏好設置時間格式 - 所以在德國或法國它將使用24小時制，而在美國則使用AM/PM。

NSDateFormatter *fmt = [[NSDateFormatter alloc] init]; 
[fmt setTimeStyle:NSDateFormatterMediumStyle]; // Full time with seconds, no TZ 
[fmt setDateStyle:NSDateFormatterNoStyle]; // No date 
NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0]; 
NSLog(@"%@", [fmt stringFromDate:now]); 

如果您嘗試自己執行日期/時間格式化，您只會激活更改其系統首選項和其他國家/地區居住者的用戶。做正確的事情，使用庫函數。