在可可/ iPhone中将纪元时间转换为NSDate

Question

我有一个纪元时间的价值，如123456789，现在我想在cocoa框架中将其转换为NSDate。有人能告诉我吗？

感谢

Answer 1

Documentation是你的朋友！

NSDate* date = [NSDate dateWithTimeIntervalSince1970:123456789];

Answer 2

由于这是一个很大的打击，将有所贡献。请注意，只需转换为NSDate即可将其置于UTC时区。然后，如果要将其显示给用户，则必须转换为您的时区，Convert epoch time to NSDate with good timezone with Objective c：

// Convert NSString to NSTimeInterval
NSTimeInterval seconds = [epochTime doubleValue];

// (Step 1) Create NSDate object
NSDate *epochNSDate = [[NSDate alloc] initWithTimeIntervalSince1970:seconds];
NSLog (@"Epoch time %@ equates to UTC %@", epochTime, epochNSDate);

// (Step 2) Use NSDateFormatter to display epochNSDate in local time zone
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss zzz"];
NSLog (@"Epoch time %@ equates to %@", epochTime, [dateFormatter stringFromDate:epochNSDate]);

// (Just for interest) Display your current time zone
NSString *currentTimeZone = [[dateFormatter timeZone] abbreviation];
NSLog (@"(Your local time zone is: %@)", currentTimeZone);