iOS之获取定月的第一天和最后一天_WANGYURUI_wyr的博客_ios 获取当月的第一天和最后一天

iOS获取定月的第一天和最后一天

+ (NSString *)getMonthBeginAndEndWith:(NSString *)dateStr{  
      
    NSDateFormatter *format=[[NSDateFormatter alloc] init];  
    [format setDateFormat:@"yyyy-MM"];  
    NSDate *newDate=[format dateFromString:dateStr];  
    double interval = 0;  
    NSDate *beginDate = nil;  
    NSDate *endDate = nil;  
    NSCalendar *calendar = [NSCalendar currentCalendar];  
      
    [calendar setFirstWeekday:2];//设定周一为周首日  
    BOOL ok = [calendar rangeOfUnit:NSMonthCalendarUnit startDate:&beginDate interval:&interval forDate:newDate];  
    //分别修改为 NSDayCalendarUnit NSWeekCalendarUnit NSYearCalendarUnit  
    if (ok) {  
        endDate = [beginDate dateByAddingTimeInterval:interval-1];  
    }else {  
        return @"";  
    }  
    NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];  
    [myDateFormatter setDateFormat:@"YYYY.MM.dd"];  
    NSString *beginString = [myDateFormatter stringFromDate:beginDate];  
    NSString *endString = [myDateFormatter stringFromDate:endDate];  
    NSString *s = [NSString stringWithFormat:@"%@-%@",beginString,endString];  
    return s;  
}  + (NSString *)getMonthBeg