关于日期的一些操作

• 获取当前日期

-(NSString *)currentDate
{
    NSDateFormatter *format = [[NSDateFormatter alloc]init];
    NSDate *date = [NSDate date];
    [format setDateFormat:@"yyyy-MM-dd"];
    return [format stringFromDate:date];
}

• 判断日期是否是今天

-(BOOL)isToday:(NSString *)dateStr
{
    NSDateFormatter *format = [[NSDateFormatter alloc]init];
    [format setDateFormat:@"yyyy-MM-dd"];
    NSDate *date = [format dateFromString:dateStr];
    return [[NSCalendar currentCalendar] isDateInToday:date];
}