尝试将这两个日期与NSDateComponents
结合使用“2012-09-03 00:00:00 +0000”& “1970-01-01 08:00:00 +0000”
我得到以下代码 - > 2012-09-02 11:00:00 +0000
unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents *comps = [[NSCalendar currentCalendar] components:unitFlags fromDate:session.date];
NSDate *day3 = [[NSCalendar currentCalendar] dateFromComponents:comps];
unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
comps = [[NSCalendar currentCalendar] components:unitFlags fromDate:session.start];
comps.timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
day3 = [[NSCalendar currentCalendar] dateByAddingComponents:comps toDate:day3 options:0];
答案 0 :(得分:5)
找到了解决方案。
以下是答案:
unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
cal.timeZone = [NSTimeZone timeZoneWithName:@"UTC"]; <--this is key
NSDateComponents *comps = [cal components:unitFlags fromDate:session.date];
comps.hour = 0;
comps.minute = 0;
NSDate *day3 = [cal dateFromComponents:comps];
unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *hourComps = [cal components:unitFlags fromDate:session.start];
day3 = [cal dateByAddingComponents:hourComps toDate:day3 options:0];
上述日期的结果应为2012-09-02 08:00:00 +0000