iOS 获取当前时间戳和时间

 NSDate *senddate = [NSDatedate];

        

        NSLog(@"date1时间戳 = %ld",time(NULL));

        NSString *date2 = [NSStringstringWithFormat:@"%ld", (long)[senddatetimeIntervalSince1970]];

        NSLog(@"date2时间戳 = %@",date2);

        

        NSDateFormatter *dateformatter = [[NSDateFormatteralloc] init];

        [dateformatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

        NSString *date1 = [dateformatter stringFromDate:senddate];

        NSLog(@"获取当前时间   = %@",date1);

        

        // 时间戳转时间

        NSDate *confromTimesp = [NSDatedateWithTimeIntervalSince1970:[senddate timeIntervalSince1970]];

        NSString *confromTimespStr = [dateformatterstringFromDate:confromTimesp];

        NSLog(@"时间戳转时间   = %@",confromTimespStr);

// 两个时间戳的间隔   返回的是秒

        NSTimeInterval time = [now timeIntervalSinceDate:oldDate];

        NSLog(@"time:%f",time/60/60/24);