iOS判断当前时间是否处于某个时间段内

/**
 *  判断当前时间是否处于某个时间段内
 *
 *  @param startTime        开始时间
 *  @param expireTime       结束时间
 */

- (BOOL)validateWithStartTime:(NSString *)startTime withExpireTime:(NSString *)expireTime {
    NSDate *today = [NSDate date];
    
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    // 时间格式,此处遇到过坑,建议时间HH大写,手机24小时进制和12小时禁止都可以完美格式化
    [dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm"];
    
    NSDate *start = [dateFormat dateFromString:startTime];
    NSDate *expire = [dateFormat dateFromString:expireTime];
    
    if ([today compare:start] == NSOrderedDescending && [today compare:expire] == NSOrderedAscending) {
        return YES;
    }
    return NO;
}

援引：http://www.cnblogs.com/wb145230/p/5266627.html