什么是世界完全对称日?有什么含义?

什么是世界完全对称日?有什么含义?
你们几个都回答的很好,我也不晓得选哪个了,

加分哦.
它指公历纪年日期中所有数字左右完全对称的日期,如昨天2010年1月2日（20100102）.
10011001
10100101
10111101
10200201
10211201
10300301
10400401
10500501
10600601
10700701
10800801
10900901
11011011
11100111
11111111
11200211
11211211
11300311
11400411
11500511
11600611
11700711
11800811
11900911
12011021
12100121
12111121
12200221
12211221
12300321
12400421
12500521
12600621
12700721
12800821
12900921
13011031
13100131
13111131
13211231
13300331
13400431
13500531
13600631
13700731
13800831
13900931
20011002
20100102
20111102
20200202
20211202
20300302
20400402
20500502
20600602
20700702
20800802
20900902
21011012
21100112
21111112
21200212
21211212
21300312
21400412
21500512
21600612
21700712
21800812
21900912
22011022
22100122
22111122
22200222
22211222
22300322
22400422
22500522
22600622
22700722
22800822
22900922
30011003
30100103
30111103
30200203
30211203
30300303
30400403
30500503
30600603
30700703
30800803
30900903
31011013
31100113
31111113
31200213
31211213
31300313
31400413
31500513
31600613
31700713
31800813
31900913
32011023
32100123
32111123
32200223
32211223
32300323
32400423
32500523
32600623
32700723
32800823
32900923
40011004
40100104
40111104
40200204
40211204
40300304
40400404
40500504
40600604
40700704
40800804
40900904
41011014
41100114
41111114
41200214
41211214
41300314
41400414
41500514
41600614
41700714
41800814
41900914
42011024
42100124
42111124
42200224
42211224
42300324
42400424
42500524
42600624
42700724
42800824
42900924
50011005
50100105
50111105
50200205
50211205
50300305
50400405
50500505
50600605
50700705
50800805
50900905
51011015
51100115
51111115
51200215
51211215
51300315
51400415
51500515
51600615
51700715
51800815
51900915
52011025
52100125
52111125
52200225
52211225
52300325
52400425
52500525
52600625
52700725
52800825
52900925
60011006
60100106
60111106
60200206
60211206
60300306
60400406
60500506
60600606
60700706
60800806
60900906
61011016
61100116
61111116
61200216
61211216
61300316
61400416
61500516
61600616
61700716
61800816
61900916
62011026
62100126
62111126
62200226
62211226
62300326
62400426
62500526
62600626
62700726
62800826
62900926
70011007
70100107
70111107
70200207
70211207
70300307
70400407
70500507
70600607
70700707
70800807
70900907
71011017
71100117
71111117
71200217
71211217
71300317
71400417
71500517
71600617
71700717
71800817
71900917
72011027
72100127
72111127
72200227
72211227
72300327
72400427
72500527
72600627
72700727
72800827
72900927
80011008
80100108
80111108
80200208
80211208
80300308
80400408
80500508
80600608
80700708
80800808
80900908
81011018
81100118
81111118
81200218
81211218
81300318
81400418
81500518
81600618
81700718
81800818
81900918
82011028
82100128
82111128
82200228
82211228
82300328
82400428
82500528
82600628
82700728
82800828
82900928
90011009
90100109
90111109
90200209
90211209
90300309
90400409
90500509
90600609
90700709
90800809
90900909
91011019
91100119
91111119
91200219
91211219
91300319
91400419
91500519
91600619
91700719
91800819
91900919
92011029
92100129
92111129
92200229
92211229
92300329
92400429
92500529
92600629
92700729
92800829
92900929
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace 世界对称日
{
class Program
{
static void Main(string[] args)
{
StreamWriter text;
text = File.CreateText("123.txt");
for (int i = 1000; i < 10000; i++)
{
string a = i.ToString();
int ri = int.Parse(a[1].ToString()) * 10 + int.Parse(a[0].ToString());
int yue = int.Parse(a[3].ToString()) * 10 + int.Parse(a[2].ToString());
if ( ri> 31 || yue > 12 || ri > 29 && yue == 2 || ri == 0 || yue == 0)
continue;
text.WriteLine(a + a[3]+a[2]+a[1]+a[0]);
Console.WriteLine(a + a[3] + a[2] + a[1] + a[0]);
}
text.Close();
Console.ReadLine();
}
}
}