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There is a problem

designation-date column must be in YYYY-MM-DD format

Reference	Name	Designation date	Document URL	Documentation URL	Geometry	Point	Notes	Entry date	Start date
36	Old Town North	1972-10-19 Invalid date			MULTIPOLYGON (((-1.403453 50.902893,-1.403621 50.902894,-1.403794 50.903005,-1.403862 50.903083,-1.403985 50.903080,-1.404085 50.903061,-1.404161 50.903026,-1.404223 50.902979,-1.404275 50.902923,-1.404374 50.902846,-1.404465 50.902805,-1.405052 50.902790,-1.405594 50.902754,-1.405571 50.902643,-1.405512 50.902446,-1.405459 50.902327,-1.405347 50.902159,-1.405148 50.901920,-1.404937 50.901552,-1.404874 50.901409,-1.404831 50.901279,-1.404798 50.901129,-1.404800 50.901003,-1.405177 50.900996,-1.405253 50.901008,-1.405290 50.901027,-1.405558 50.900808,-1.405835 50.900813,-1.405839 50.900675,-1.405867 50.900417,-1.405873 50.900189,-1.405492 50.900181,-1.405492 50.900081,-1.404740 50.900067,-1.404751 50.899722,-1.404770 50.899568,-1.404832 50.899313,-1.404363 50.899271,-1.404364 50.899178,-1.403803 50.899125,-1.403794 50.899518,-1.403058 50.899497,-1.403075 50.899739,-1.403185 50.899738,-1.403184 50.899842,-1.403303 50.899842,-1.403307 50.899907,-1.403275 50.899909,-1.403277 50.899975,-1.403044 50.899984,-1.403048 50.899906,-1.402967 50.899908,-1.402968 50.899885,-1.402734 50.899881,-1.402737 50.899858,-1.402173 50.899796,-1.402078 50.900261,-1.402681 50.900297,-1.402610 50.900988,-1.402600 50.901269,-1.403203 50.901266,-1.403201 50.901409,-1.403390 50.901410,-1.403389 50.901438,-1.403451 50.901436,-1.403450 50.901597,-1.403528 50.901597,-1.403530 50.901760,-1.403690 50.901760,-1.403687 50.901990,-1.403351 50.901997,-1.403361 50.902244,-1.403491 50.902245,-1.403453 50.902893)))	POINT (-1.404112 50.901013)		2024-12-11	1972-10-19
24	Old Town West	1972-10-19 Invalid date			MULTIPOLYGON (((-1.405594 50.902754,-1.406322 50.902738,-1.406294 50.902316,-1.406355 50.901789,-1.406435 50.901300,-1.406591 50.900741,-1.406694 50.900477,-1.406752 50.900230,-1.406782 50.899974,-1.406933 50.899569,-1.407032 50.899334,-1.407176 50.899087,-1.407310 50.898910,-1.407426 50.898710,-1.407506 50.898550,-1.407507 50.898439,-1.407475 50.898311,-1.407403 50.898154,-1.407278 50.897957,-1.407118 50.897791,-1.406785 50.897538,-1.406385 50.897306,-1.405924 50.897066,-1.405843 50.897035,-1.405809 50.897011,-1.405730 50.897127,-1.405509 50.897549,-1.405336 50.897926,-1.405268 50.898093,-1.405231 50.898239,-1.405215 50.898273,-1.405179 50.898310,-1.405112 50.898340,-1.404920 50.898396,-1.405023 50.898631,-1.404832 50.899313,-1.404770 50.899568,-1.404743 50.899832,-1.404740 50.900067,-1.405492 50.900081,-1.405492 50.900181,-1.405873 50.900189,-1.405867 50.900417,-1.405839 50.900675,-1.405835 50.900813,-1.405558 50.900808,-1.405290 50.901027,-1.405253 50.901008,-1.405177 50.900996,-1.404800 50.901003,-1.404798 50.901129,-1.404831 50.901279,-1.404874 50.901409,-1.404937 50.901552,-1.405148 50.901920,-1.405347 50.902159,-1.405459 50.902327,-1.405512 50.902446,-1.405571 50.902643,-1.405594 50.902754)))	POINT (-1.40601 50.899645)		2024-12-11	1972-10-19
23	Old Woolston 4	1974-01-01 Invalid date			MULTIPOLYGON (((-1.371387 50.897110,-1.371770 50.896595,-1.370808 50.896294,-1.370724 50.896407,-1.370506 50.896337,-1.370537 50.896300,-1.370123 50.896188,-1.370224 50.896044,-1.370109 50.896024,-1.370021 50.896160,-1.369918 50.896135,-1.369631 50.896577,-1.370594 50.896855,-1.371387 50.897110)))	POINT (-1.37071 50.896598)		2024-12-11	1974-01-01
67	Old Woolston 1	1974-01-01 Invalid date			MULTIPOLYGON (((-1.376085 50.894850,-1.375901 50.895145,-1.375816 50.895127,-1.375594 50.895523,-1.375400 50.895480,-1.375340 50.895595,-1.375252 50.895721,-1.375483 50.895778,-1.375401 50.895921,-1.375008 50.895836,-1.374747 50.896267,-1.375397 50.896452,-1.375686 50.896523,-1.375730 50.896417,-1.375770 50.896222,-1.376413 50.896329,-1.376481 50.896209,-1.376476 50.896208,-1.376491 50.896178,-1.376545 50.896189,-1.376764 50.895794,-1.376717 50.895783,-1.376926 50.895423,-1.377606 50.895579,-1.377395 50.895937,-1.377916 50.896055,-1.378248 50.895480,-1.378337 50.895299,-1.378145 50.895259,-1.378035 50.895427,-1.377946 50.895585,-1.377482 50.895477,-1.377648 50.895136,-1.377699 50.895069,-1.378354 50.895225,-1.378473 50.894996,-1.378435 50.894973,-1.378484 50.894837,-1.378449 50.894790,-1.378218 50.894696,-1.378189 50.894680,-1.378180 50.894652,-1.378132 50.894640,-1.378071 50.894731,-1.378016 50.894752,-1.378001 50.894784,-1.377966 50.894810,-1.377283 50.894645,-1.377423 50.894321,-1.377529 50.894126,-1.377683 50.893787,-1.378154 50.893962,-1.378558 50.893306,-1.378646 50.893241,-1.378877 50.892967,-1.378952 50.892916,-1.378442 50.892633,-1.378301 50.892712,-1.378181 50.892789,-1.377953 50.892971,-1.377840 50.893215,-1.377529 50.893816,-1.377514 50.893809,-1.377510 50.893816,-1.376944 50.893444,-1.376967 50.893426,-1.376933 50.893408,-1.376914 50.893423,-1.376709 50.893279,-1.376610 50.893334,-1.376516 50.893272,-1.375355 50.893432,-1.374925 50.894576,-1.375420 50.894676,-1.375562 50.894727,-1.375935 50.894815,-1.376089 50.894844,-1.376085 50.894850),(-1.377660 50.895007,-1.377608 50.895059,-1.377555 50.895135,-1.377421 50.895432,-1.377411 50.895451,-1.377391 50.895455,-1.376887 50.895337,-1.377042 50.895027,-1.376795 50.894977,-1.376582 50.894921,-1.376095 50.894832,-1.376149 50.894741,-1.376132 50.894671,-1.376154 50.894636,-1.376450 50.894628,-1.376698 50.894634,-1.376648 50.894756,-1.377094 50.894822,-1.377060 50.894896,-1.377660 50.895007)))	POINT (-1.376646 50.894605)		2024-12-11	1974-01-01
69	Old Woolston 3	1974-01-01 Invalid date			MULTIPOLYGON (((-1.372595 50.897460,-1.372941 50.897549,-1.373220 50.897595,-1.373901 50.897687,-1.374061 50.897382,-1.374194 50.897244,-1.374297 50.897169,-1.374329 50.897136,-1.374696 50.897210,-1.374648 50.897312,-1.374634 50.897309,-1.374625 50.897329,-1.374961 50.897394,-1.374801 50.897724,-1.374801 50.897738,-1.374814 50.897747,-1.374927 50.897757,-1.374970 50.897744,-1.375003 50.897722,-1.375018 50.897701,-1.375268 50.897183,-1.374376 50.897008,-1.374245 50.897139,-1.374125 50.897244,-1.373286 50.897021,-1.373197 50.897157,-1.372865 50.897064,-1.372724 50.897285,-1.372595 50.897460)))	POINT (-1.373824 50.897344)		2024-12-11	1974-01-01
70	St Annes Road	1986-01-09 Invalid date			MULTIPOLYGON (((-1.367909 50.894192,-1.368183 50.894255,-1.367991 50.894676,-1.368616 50.894804,-1.369280 50.893918,-1.369551 50.893987,-1.369686 50.893734,-1.369457 50.893681,-1.369478 50.893654,-1.368720 50.893472,-1.368679 50.893548,-1.368444 50.893490,-1.368033 50.894021,-1.367993 50.894013,-1.367909 50.894192)))	POINT (-1.368673 50.894073)		2024-12-11	1986-01-09
15	The Avenue	1975-01-02 Invalid date	https://www.southampton.gov.uk/media/xmzeou3y/the-avenue-conservation-area-appraisal-management-plan-2013_tcm63-363391.pdf	https://www.southampton.gov.uk/planning/heritage/conservation-areas/the-avenue/	MULTIPOLYGON (((-1.402135 50.914185,-1.402043 50.914153,-1.401386 50.914126,-1.400975 50.914159,-1.401050 50.914356,-1.400916 50.914459,-1.400459 50.914673,-1.400785 50.915162,-1.401107 50.915083,-1.401583 50.915845,-1.401270 50.915926,-1.401916 50.916985,-1.402019 50.917014,-1.402041 50.917061,-1.402034 50.917064,-1.402212 50.917450,-1.402127 50.917464,-1.402195 50.917611,-1.402122 50.917626,-1.402515 50.918449,-1.402628 50.918670,-1.402918 50.918634,-1.402983 50.918869,-1.402834 50.918882,-1.402958 50.919273,-1.403146 50.919236,-1.403278 50.919492,-1.403533 50.920042,-1.403561 50.920064,-1.403772 50.920021,-1.403850 50.920191,-1.403967 50.920176,-1.404022 50.920301,-1.403947 50.920318,-1.403996 50.920412,-1.404029 50.920406,-1.404166 50.920821,-1.403866 50.920869,-1.403968 50.921072,-1.404767 50.920916,-1.404909 50.921604,-1.405736 50.921465,-1.406350 50.921349,-1.406741 50.921287,-1.406675 50.921134,-1.406485 50.920759,-1.406362 50.920794,-1.406174 50.920500,-1.406068 50.920354,-1.405828 50.920043,-1.405680 50.919824,-1.405542 50.919668,-1.405683 50.919632,-1.405623 50.919545,-1.405324 50.919616,-1.405262 50.919523,-1.405230 50.919527,-1.405154 50.919403,-1.405462 50.919328,-1.405311 50.919126,-1.405179 50.919176,-1.404990 50.918915,-1.404891 50.918795,-1.404831 50.918561,-1.404721 50.918258,-1.404510 50.917795,-1.404587 50.917780,-1.404367 50.917315,-1.404615 50.917269,-1.404301 50.916536,-1.404065 50.915855,-1.404043 50.915861,-1.404014 50.915691,-1.403859 50.915109,-1.403488 50.915133,-1.403455 50.914913,-1.403374 50.914901,-1.402503 50.914942,-1.402319 50.914359,-1.402273 50.914286,-1.402229 50.914244,-1.402135 50.914185)))	POINT (-1.403537 50.917751)	Polygons on interactive mapExtra documents are available.	2024-12-11	1975-01-02
16	Cranbury Place	1977-09-08 Invalid date	https://www.southampton.gov.uk/media/flcbgkvu/cranbury-place-conservation-area-appraisal-management-plan-2013_tcm63-363335.pdf	https://www.southampton.gov.uk/planning/heritage/conservation-areas/cranbury-place/	MULTIPOLYGON (((-1.397636 50.915494,-1.398014 50.915460,-1.398021 50.915467,-1.398207 50.915395,-1.398242 50.915441,-1.398701 50.915304,-1.400564 50.914829,-1.400459 50.914673,-1.400916 50.914459,-1.401050 50.914356,-1.400970 50.914134,-1.400935 50.914126,-1.400911 50.914003,-1.400811 50.913862,-1.400826 50.913848,-1.400783 50.913800,-1.400630 50.913577,-1.399095 50.913622,-1.399043 50.913633,-1.399010 50.913664,-1.398719 50.913675,-1.398290 50.913673,-1.397827 50.913645,-1.397803 50.913742,-1.397570 50.913718,-1.397429 50.914319,-1.397147 50.914371,-1.397383 50.914899,-1.397629 50.914857,-1.397757 50.914929,-1.397085 50.915579,-1.397170 50.915665,-1.397228 50.915694,-1.397636 50.915494)))	POINT (-1.398976 50.914442)	Polygons on interactive mapExtra documents are available. Best Map is shown on page 4 of the appraisal document.	2024-12-11	1977-09-08
71	Old Woolston 3	Invalid date			MULTIPOLYGON (((-1.374494 50.898402,-1.374496 50.898374,-1.374513 50.898365,-1.374525 50.898011,-1.374509 50.897998,-1.374510 50.897974,-1.374529 50.897961,-1.374498 50.897909,-1.374452 50.897874,-1.374381 50.897851,-1.373992 50.897793,-1.373834 50.898216,-1.374048 50.898257,-1.374035 50.898287,-1.374125 50.898300,-1.374116 50.898330,-1.374306 50.898362,-1.374455 50.898401,-1.374494 50.898402)))	POINT (-1.374221 50.898091)		2024-12-11

How to fix this issue

Your dataset is missing the designation-date column.

The Conservation area guidance explains how to fix the issue:

designation-date

The date that the conservation area was officially designated, written in YYYY-MM-DD format.

Example:

1984-03-28

With dates, some data is better than no data, so:

1984 is fine
1984-03 is better
1984-04-28 is brilliant

How to improve Southampton City Council’s data

Fix the errors indicated
Use the check service to make sure the data meets the standard
Publish the updated data on the endpoint URL