Append date range to feature labels

data/core.yaml

@@ -760,6 +760,10 @@ en:
     lock:
       suggestion: 'The "{label}" field is locked because there is a Wikidata tag. You can delete it or edit the tags in the "Tags" section.'
     display_name:
+      # format for the label of a feature that has a name and date range
+      dated: "{name} [{dateRange}]"
+      # compact format for expressing a range of years
+      date_range: "{start}–{end}"
       direction: "{direction}"
       network: "{network}"
       from_to: "from {from} to {to}"

modules/util/util.js

@@ -180,9 +180,43 @@ export function utilGetAllNodes(ids, graph) {
 
 
 export function utilDisplayName(entity) {
+    let dateRange;
+    if (entity.tags.start_date || entity.tags.end_date) {
+        // Parse the start and end dates, discarding unnecessary precision, since the display name must be fairly succinct.
+        let start = entity.tags.start_date && utilNormalizeDateString(entity.tags.start_date);
+        if (start) {
+            delete start.localeOptions.month;
+            delete start.localeOptions.day;
+        }
+        let end = entity.tags.end_date && utilNormalizeDateString(entity.tags.end_date);
+        if (end) {
+            delete end.localeOptions.month;
+            delete end.localeOptions.day;
+
+            if (start) {
+                // If the start date has an explicit era, then so must the end date.
+                end.localeOptions.era = start.localeOptions.era;
+            }
+        }
+
+        let dates = [
+            start ? new Intl.DateTimeFormat(localizer.languageCode(), start.localeOptions).format(start.date) : '',
+            end ? new Intl.DateTimeFormat(localizer.languageCode(), end.localeOptions).format(end.date) : '',
+        ];
+
+        // Omit a redundant date.
+        if (dates[0] === dates[1]) {
+            dateRange = dates[0];
+        } else {
+            dateRange = t('inspector.display_name.date_range', {start: dates[0], end: dates[1]});
+        }
+    }
+
     var localizedNameKey = 'name:' + localizer.languageCode().toLowerCase();
     var name = entity.tags[localizedNameKey] || entity.tags.name || '';
-    if (name) return name;
+    if (name) {
+        return dateRange ? t('inspector.display_name.dated', {dateRange: dateRange, name: name}) : name;
+    }
 
     var tags = {
         direction: entity.tags.direction,
@@ -218,7 +252,7 @@ export function utilDisplayName(entity) {
         name = t('inspector.display_name.' + keyComponents.join('_'), tags);
     }
 
-    return name;
+    return name && dateRange ? t('inspector.display_name.dated', {dateRange: dateRange, name: name}) : name;
 }
 
 

test/spec/util/util.js

@@ -283,6 +283,16 @@ describe('iD.util', function() {
             // BART Yellow Line: Antioch => Pittsburg/Bay Point => SFO Airport => Millbrae
             expect(iD.utilDisplayName({tags: {network: 'BART', ref: 'Yellow', from: 'Antioch', to: 'Millbrae', via: 'Pittsburg/Bay Point;San Francisco International Airport', route: 'subway'}})).to.eql('BART Yellow from Antioch to Millbrae via Pittsburg/Bay Point;San Francisco International Airport');
         });
+        it('appends a date range', function() {
+            expect(iD.utilDisplayName({tags: {name: 'Arbre Perdu', 'name:en': 'Lost Tree'}})).to.eql('Lost Tree');
+            expect(iD.utilDisplayName({tags: {name: 'Arbre du Ténéré', 'name:en': 'Tree of Ténéré', start_date: '1673', end_date: '1973'}})).to.eql('Tree of Ténéré [1673–1973]');
+            expect(iD.utilDisplayName({tags: {name: 'Charter Oak', start_date: '1614', end_date: '1856-08-21'}})).to.eql('Charter Oak [1614–1856]');
+            expect(iD.utilDisplayName({tags: {name: 'Prometheus', start_date: '-2899', end_date: '1964-08'}})).to.eql('Prometheus [2900 BC–1964 AD]');
+            expect(iD.utilDisplayName({tags: {name: 'ජය ශ්‍රී මහා බෝධිය', 'name:en': 'Jaya Sri Maha Bodhi', start_date: '-287'}})).to.eql('Jaya Sri Maha Bodhi [288 BC–]');
+            expect(iD.utilDisplayName({tags: {name: 'Son of the Tree That Owns Itself', start_date: '1946-12-04'}})).to.eql('Son of the Tree That Owns Itself [1946–]');
+            expect(iD.utilDisplayName({tags: {name: 'Great Elm', end_date: '1876-02-15'}})).to.eql('Great Elm [–1876]');
+            expect(iD.utilDisplayName({tags: {name: 'Capitol Christmas Tree', start_date: '2021-11-19', end_date: '2021-12-25'}})).to.eql('Capitol Christmas Tree [2021]');
+        });
     });
 
     describe('utilOldestID', function() {