在iOS中轉換系統時區中的任何時區日期

Question

將給定日期轉換為iOS中的系統時區時遇到問題。

原始日期：2013年3月18日03:54:18 //日期為AM格式目的地日期應為：2013-03-18 03:30:15 //其PM格式。

我怎么能得到這個？

我試過下面的代碼，但也得到錯誤的數據和區別。

NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSLog(@"Post date::%@",postDate);
NSDate *utc = [fmt dateFromString:postDate];
fmt.timeZone = [NSTimeZone systemTimeZone];
NSString *local = [fmt stringFromDate:utc];
NSLog(@" local %@", local);

NSDate *date1 = [NSDate date];
NSString *currentDateString = [fmt stringFromDate:date1];
NSDate *currentDate = [fmt dateFromString:currentDateString];
NSUInteger flags = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
NSDateComponents *difference = [[NSCalendar currentCalendar] components:flags fromDate:utc toDate:currentDate options:0];
NSLog(@"difference::%d",[difference day]);
NSLog(@"difference::%d",[difference hour]);
NSLog(@"difference::%d",[difference minute]);

編輯：輸出

Post date::2013-03-18 03:20:09 
local 2013-03-18 03:20:09 
difference::0 
difference::13 
difference::2

Answer 1

從...替換您的代碼

fmt.timeZone = [NSTimeZone systemTimeZone];

像這樣

fmt.timeZone = [NSTimeZone localTimeZone];

這將為您服務...

Answer 2

NSString *openingHour = @"15:05:35 ";
 NSDateFormatter *workingHoursFormatter = [[NSDateFormatter alloc] init]; 
        NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
        [workingHoursFormatter setTimeZone:timeZone];
        [workingHoursFormatter setDateFormat:@"HH:mm"];
        NSDate *openingTime = [workingHoursFormatter dateFromString:openingHour];

您可以嘗試上述代碼對我有用嗎，請根據需要更改日期格式