所有對稱日
作者：gugod 發佈於：不知為何突然出現的世界對稱日 2011-11-02 在 Twitter 廣為流傳，前一個對稱日 2010-01-02 卻沒有那麼紅。
寫個小程式就可以簡單算出公曆（Gregorian calendar） 算法中所有有效對稱的日期，以下依照年月日排序列舉。注意到 9220-02-29 這 一年是閏年，而在 2001-10-02 的前一個對稱日，竟隔了 621 年之久。我的生日是 8 號，看來我活不到 80xx 年的對稱日生日了...
- 0101-10-10
- 0110-01-10
- 0111-11-10
- 0120-02-10
- 0121-12-10
- 0130-03-10
- 0140-04-10
- 0150-05-10
- 0160-06-10
- 0170-07-10
- 0180-08-10
- 0190-09-10
- 0201-10-20
- 0210-01-20
- 0211-11-20
- 0220-02-20
- 0221-12-20
- 0230-03-20
- 0240-04-20
- 0250-05-20
- 0260-06-20
- 0270-07-20
- 0280-08-20
- 0290-09-20
- 0301-10-30
- 0310-01-30
- 0311-11-30
- 0321-12-30
- 0330-03-30
- 0340-04-30
- 0350-05-30
- 0360-06-30
- 0370-07-30
- 0380-08-30
- 0390-09-30
- 1001-10-01
- 1010-01-01
- 1011-11-01
- 1020-02-01
- 1021-12-01
- 1030-03-01
- 1040-04-01
- 1050-05-01
- 1060-06-01
- 1070-07-01
- 1080-08-01
- 1090-09-01
- 1101-10-11
- 1110-01-11
- 1111-11-11
- 1120-02-11
- 1121-12-11
- 1130-03-11
- 1140-04-11
- 1150-05-11
- 1160-06-11
- 1170-07-11
- 1180-08-11
- 1190-09-11
- 1201-10-21
- 1210-01-21
- 1211-11-21
- 1220-02-21
- 1221-12-21
- 1230-03-21
- 1240-04-21
- 1250-05-21
- 1260-06-21
- 1270-07-21
- 1280-08-21
- 1290-09-21
- 1301-10-31
- 1310-01-31
- 1321-12-31
- 1330-03-31
- 1350-05-31
- 1370-07-31
- 1380-08-31
- 2001-10-02
- 2010-01-02
- 2011-11-02
- 2020-02-02
- 2021-12-02
- 2030-03-02
- 2040-04-02
- 2050-05-02
- 2060-06-02
- 2070-07-02
- 2080-08-02
- 2090-09-02
- 2101-10-12
- 2110-01-12
- 2111-11-12
- 2120-02-12
- 2121-12-12
- 2130-03-12
- 2140-04-12
- 2150-05-12
- 2160-06-12
- 2170-07-12
- 2180-08-12
- 2190-09-12
- 2201-10-22
- 2210-01-22
- 2211-11-22
- 2220-02-22
- 2221-12-22
- 2230-03-22
- 2240-04-22
- 2250-05-22
- 2260-06-22
- 2270-07-22
- 2280-08-22
- 2290-09-22
- 3001-10-03
- 3010-01-03
- 3011-11-03
- 3020-02-03
- 3021-12-03
- 3030-03-03
- 3040-04-03
- 3050-05-03
- 3060-06-03
- 3070-07-03
- 3080-08-03
- 3090-09-03
- 3101-10-13
- 3110-01-13
- 3111-11-13
- 3120-02-13
- 3121-12-13
- 3130-03-13
- 3140-04-13
- 3150-05-13
- 3160-06-13
- 3170-07-13
- 3180-08-13
- 3190-09-13
- 3201-10-23
- 3210-01-23
- 3211-11-23
- 3220-02-23
- 3221-12-23
- 3230-03-23
- 3240-04-23
- 3250-05-23
- 3260-06-23
- 3270-07-23
- 3280-08-23
- 3290-09-23
- 4001-10-04
- 4010-01-04
- 4011-11-04
- 4020-02-04
- 4021-12-04
- 4030-03-04
- 4040-04-04
- 4050-05-04
- 4060-06-04
- 4070-07-04
- 4080-08-04
- 4090-09-04
- 4101-10-14
- 4110-01-14
- 4111-11-14
- 4120-02-14
- 4121-12-14
- 4130-03-14
- 4140-04-14
- 4150-05-14
- 4160-06-14
- 4170-07-14
- 4180-08-14
- 4190-09-14
- 4201-10-24
- 4210-01-24
- 4211-11-24
- 4220-02-24
- 4221-12-24
- 4230-03-24
- 4240-04-24
- 4250-05-24
- 4260-06-24
- 4270-07-24
- 4280-08-24
- 4290-09-24
- 5001-10-05
- 5010-01-05
- 5011-11-05
- 5020-02-05
- 5021-12-05
- 5030-03-05
- 5040-04-05
- 5050-05-05
- 5060-06-05
- 5070-07-05
- 5080-08-05
- 5090-09-05
- 5101-10-15
- 5110-01-15
- 5111-11-15
- 5120-02-15
- 5121-12-15
- 5130-03-15
- 5140-04-15
- 5150-05-15
- 5160-06-15
- 5170-07-15
- 5180-08-15
- 5190-09-15
- 5201-10-25
- 5210-01-25
- 5211-11-25
- 5220-02-25
- 5221-12-25
- 5230-03-25
- 5240-04-25
- 5250-05-25
- 5260-06-25
- 5270-07-25
- 5280-08-25
- 5290-09-25
- 6001-10-06
- 6010-01-06
- 6011-11-06
- 6020-02-06
- 6021-12-06
- 6030-03-06
- 6040-04-06
- 6050-05-06
- 6060-06-06
- 6070-07-06
- 6080-08-06
- 6090-09-06
- 6101-10-16
- 6110-01-16
- 6111-11-16
- 6120-02-16
- 6121-12-16
- 6130-03-16
- 6140-04-16
- 6150-05-16
- 6160-06-16
- 6170-07-16
- 6180-08-16
- 6190-09-16
- 6201-10-26
- 6210-01-26
- 6211-11-26
- 6220-02-26
- 6221-12-26
- 6230-03-26
- 6240-04-26
- 6250-05-26
- 6260-06-26
- 6270-07-26
- 6280-08-26
- 6290-09-26
- 7001-10-07
- 7010-01-07
- 7011-11-07
- 7020-02-07
- 7021-12-07
- 7030-03-07
- 7040-04-07
- 7050-05-07
- 7060-06-07
- 7070-07-07
- 7080-08-07
- 7090-09-07
- 7101-10-17
- 7110-01-17
- 7111-11-17
- 7120-02-17
- 7121-12-17
- 7130-03-17
- 7140-04-17
- 7150-05-17
- 7160-06-17
- 7170-07-17
- 7180-08-17
- 7190-09-17
- 7201-10-27
- 7210-01-27
- 7211-11-27
- 7220-02-27
- 7221-12-27
- 7230-03-27
- 7240-04-27
- 7250-05-27
- 7260-06-27
- 7270-07-27
- 7280-08-27
- 7290-09-27
- 8001-10-08
- 8010-01-08
- 8011-11-08
- 8020-02-08
- 8021-12-08
- 8030-03-08
- 8040-04-08
- 8050-05-08
- 8060-06-08
- 8070-07-08
- 8080-08-08
- 8090-09-08
- 8101-10-18
- 8110-01-18
- 8111-11-18
- 8120-02-18
- 8121-12-18
- 8130-03-18
- 8140-04-18
- 8150-05-18
- 8160-06-18
- 8170-07-18
- 8180-08-18
- 8190-09-18
- 8201-10-28
- 8210-01-28
- 8211-11-28
- 8220-02-28
- 8221-12-28
- 8230-03-28
- 8240-04-28
- 8250-05-28
- 8260-06-28
- 8270-07-28
- 8280-08-28
- 8290-09-28
- 9001-10-09
- 9010-01-09
- 9011-11-09
- 9020-02-09
- 9021-12-09
- 9030-03-09
- 9040-04-09
- 9050-05-09
- 9060-06-09
- 9070-07-09
- 9080-08-09
- 9090-09-09
- 9101-10-19
- 9110-01-19
- 9111-11-19
- 9120-02-19
- 9121-12-19
- 9130-03-19
- 9140-04-19
- 9150-05-19
- 9160-06-19
- 9170-07-19
- 9180-08-19
- 9190-09-19
- 9201-10-29
- 9210-01-29
- 9211-11-29
- 9220-02-29
- 9221-12-29
- 9230-03-29
- 9240-04-29
- 9250-05-29
- 9260-06-29
- 9270-07-29
- 9280-08-29
- 9290-09-29