从 Objective C 和 iOS 中的 24 小时格式时间字符串中获取不正确的日期

Question

我必须从 24 小时格式 (HH:mm) 时间字符串中获取格式 (YYYY-MM-dd hh:mm:ss) 的日期。

我使用了以下代码，但输出错误：

 NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
 [formatter setCalendar:[[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]];
 [formatter setLocale:[NSLocale localeWithLocaleIdentifier:@"en_US_POSIX"]];
 [formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
 [formatter setDateFormat:@"HH:mm"];

 NSDate *myDate = [formatter dateFromString:@"13:54"];

我的输出不正确：2000-01-01 13:54:00 +0000

但我想要像“2017-01-02 13:54:00”这样的输出

我检查了 this question 但没有得到正确的解决方案。

Answer 1

试试这个

NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
[dateFormatter1 setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *date = [dateFormatter1 dateFromString:yourdateString];

NSTimeZone *currentTimeZone = [NSTimeZone localTimeZone]; // <- Local time zone
NSTimeZone *utcTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];

NSInteger currentGMTOffset = [currentTimeZone secondsFromGMTForDate:date];
NSInteger gmtOffset = [utcTimeZone secondsFromGMTForDate:date];
            NSTimeInterval gmtInterval = currentGMTOffset - gmtOffset;



NSDate *destinationDate = [[NSDate alloc] initWithTimeInterval:gmtInterval    sinceDate:date];

NSDateFormatter *dateFormatters = [[NSDateFormatter alloc] init];
            [dateFormatters setDateFormat:@"MMM dd yyyy hh:mm"];

self.callDate = [dateFormatters stringFromDate: destinationDate];

Answer 2

试试这个代码..

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH-mm-ss"];
NSString *myString = [dateFormatter stringFromDate:myDate];

Answer 3

输出正确。

没有年/月/日信息的日期字符串导致 NSDateFormatter 中的日期 2000/1/1。

您需要获取当前日期并将 hour 和 minute 组件替换为日期字符串的组件。

NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *todayComponents = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:[NSDate date]];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
[formatter setDateFormat:@"HH:mm"];
NSDate *myDate = [formatter dateFromString:@"13:54"];
NSDateComponents *myDateComponents = [calendar components:NSCalendarUnitHour | NSCalendarUnitMinute fromDate:myDate];
todayComponents.minute = myDateComponents.minute;
todayComponents.hour = myDateComponents.hour;
NSDate *myCompleteDate = [calendar dateFromComponents:todayComponents];

从 Objective C 和 iOS 中的 24 小时格式时间字符串中获取不正确的日期

Getting incorrect date from 24 hours format time string in Objective C and iOS

objective-c

nsdate

nsdateformatter

ios