+(NSString*)getWeekDay:(NSString*)currentStr

{

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

    [dateFormatsetDateFormat:@"yyyy-MM-dd"];

    NSDate*date =[dateFormatdateFromString:currentStr];

    NSArray*weekdays = [NSArray arrayWithObjects: [NSNull null],@"星期日",@"星期一",@"星期二",@"星期三",@"星期四",@"星期五",@"星期六",nil];

    NSCalendar*calendar = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    NSTimeZone*timeZone = [[NSTimeZonealloc]initWithName:@"Asia/Shanghai"];

    [calendarsetTimeZone: timeZone];

    NSCalendarUnit calendarUnit =NSCalendarUnitWeekday;

    NSDateComponents*theComponents = [calendarcomponents:calendarUnitfromDate:date];

    return[weekdaysobjectAtIndex:theComponents.weekday];

}