学步园

    //获取系统当前时间

    - (NSString*)get_system_today_time

    {

        NSDate *date = [NSDate date];

        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

        [formatter setDateStyle:kCFDateFormatterMediumStyle];

        [formatter setTimeStyle:kCFDateFormatterShortStyle];

        [formatter setDateFormat:@"YYYY-MM-dd-hh-mm-ss"];

        NSString *string_time = [formatterstringFromDate:date];

        NSArray *time = [string_timecomponentsSeparatedByString:@"-"];

        int value_year = [[timeobjectAtIndex:0]intValue];

        int value_month = [[timeobjectAtIndex:1]intValue];

        int value_day = [[timeobjectAtIndex:2]intValue];

        int value_hour = [[timeobjectAtIndex:3]intValue];

        int value_minute = [[timeobjectAtIndex:4]intValue];

        int value_second = [[timeobjectAtIndex:5]intValue];

        [formatter setDateFormat:@"EEEE"];

        NSString *week_day = [formatter stringFromDate:date];

        [formatter release];

       NSString *system_time = [[NSStringalloc]initWithFormat:@"{\"year\":\"%d\",\"month\":\"%d\",\"day\":\"%d\",\"hour\":\"%d\",\"minute\":\"%d\",\"second\":\"%d\",\"week_day\":\"%@\"}",value_year,value_month,value_day,value_hour,value_minute,value_second,week_day];

        NSLog(@"\nsystem time is %@",system_time);

        return [system_timeautorelease];

    }

----------------------------------------------------------------------------

NSDate *date = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *comps;


// 年月日获得

comps = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) 

                                        fromDate:date];

NSInteger year = [comps year];

NSInteger month = [comps month];

NSInteger day = [comps day];

NSLog(@"year: %d month: %d, day: %d", year, month, day);



//当前的时分秒获得

comps = [calendar components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit)

                                        fromDate:date];

NSInteger hour = [comps hour];

NSInteger minute = [comps minute];

NSInteger second = [comps second];

NSLog(@"hour: %d minute: %d second: %d", hour, minute, second);


// 周几和星期几获得

comps = [calendar components:(NSWeekCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit)

                                        fromDate:date];

NSInteger week = [comps week]; // 今年的第几周

NSInteger weekday = [comps weekday]; // 星期几（注意，周日是“1”，周一是“2”。。。。）

NSInteger weekdayOrdinal = [comps weekdayOrdinal]; // 这个月的第几周

NSLog(@"week: %d weekday: %d weekday ordinal: %d", week, weekday, weekdayOrdinal);