将 UNIX 时间戳转换为日期、小时、分钟、秒

Question

在 Objective-C 中，如何将 UNIX 时间戳（即表示时间戳的数字形式）转换为日期、时间（小时、分钟、秒）？

Answer 1

For output, use an NSDateFormatter . To extract values for other purposes, use NSDateComponents . eg:

NSDate *date = [NSDate dateWithTimeIntervalSince1970:1234567];
NSDateComponents *weekdayComponents = [[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:date];
int weekday = [weekdayComponents weekday];