Rename standalone formatDateTime to formatSortableDateTime

src/sidebar/components/Annotation/test/AnnotationTimestamps-test.js

@@ -6,7 +6,9 @@ import AnnotationTimestamps, { $imports } from '../AnnotationTimestamps';
 
 describe('AnnotationTimestamps', () => {
   let clock;
-  let fakeTime;
+  let fakeFormatDateTime;
+  let fakeFormatRelativeDate;
+  let fakeDecayingInterval;
 
   const createComponent = props =>
     mount(
@@ -21,15 +23,16 @@ describe('AnnotationTimestamps', () => {
 
   beforeEach(() => {
     clock = sinon.useFakeTimers();
-
-    fakeTime = {
-      formatDateTime: sinon.stub().returns('absolute date'),
-      formatRelativeDate: sinon.stub().returns('fuzzy string'),
-      decayingInterval: sinon.stub(),
-    };
+    fakeFormatDateTime = sinon.stub().returns('absolute date');
+    fakeFormatRelativeDate = sinon.stub().returns('fuzzy string');
+    fakeDecayingInterval = sinon.stub();
 
     $imports.$mock({
-      '@hypothesis/frontend-shared': fakeTime,
+      '@hypothesis/frontend-shared': {
+        formatDateTime: fakeFormatDateTime,
+        formatRelativeDate: fakeFormatRelativeDate,
+        decayingInterval: fakeDecayingInterval,
+      },
     });
   });
 
@@ -58,7 +61,7 @@ describe('AnnotationTimestamps', () => {
   });
 
   it('renders edited timestamp if `withEditedTimestamp` is true', () => {
-    fakeTime.formatRelativeDate.onCall(1).returns('another fuzzy string');
+    fakeFormatRelativeDate.onCall(1).returns('another fuzzy string');
 
     const wrapper = createComponent({ withEditedTimestamp: true });
 
@@ -68,7 +71,7 @@ describe('AnnotationTimestamps', () => {
   });
 
   it('does not render edited relative date if equivalent to created relative date', () => {
-    fakeTime.formatRelativeDate.returns('equivalent fuzzy strings');
+    fakeFormatRelativeDate.returns('equivalent fuzzy strings');
 
     const wrapper = createComponent({ withEditedTimestamp: true });
 
@@ -78,12 +81,12 @@ describe('AnnotationTimestamps', () => {
   });
 
   it('is updated after time passes', () => {
-    fakeTime.decayingInterval.callsFake((date, callback) => {
+    fakeDecayingInterval.callsFake((date, callback) => {
       const id = setTimeout(callback, 10);
       return () => clearTimeout(id);
     });
     const wrapper = createComponent();
-    fakeTime.formatRelativeDate.returns('60 jiffies');
+    fakeFormatRelativeDate.returns('60 jiffies');
 
     act(() => {
       clock.tick(1000);

src/sidebar/services/annotations-exporter.tsx

@@ -15,7 +15,7 @@ import { annotationDisplayName } from '../helpers/annotation-user';
 import { stripInternalProperties } from '../helpers/strip-internal-properties';
 import { VersionData } from '../helpers/version-data';
 import { renderMathAndMarkdown } from '../render-markdown';
-import { formatDateTime } from '../util/time';
+import { formatSortableDateTime } from '../util/time';
 
 export type JSONExportContent = {
   export_date: string;
@@ -91,7 +91,7 @@ export class AnnotationsExporter {
       const page = pageLabel(annotation);
       const annotationQuote = quote(annotation);
       const lines = [
-        `Created at: ${formatDateTime(new Date(annotation.created))}`,
+        `Created at: ${formatSortableDateTime(new Date(annotation.created))}`,
         `Author: ${extractUsername(annotation)}`,
         page ? `Page: ${page}` : undefined,
         `Type: ${annotationRole(annotation)}`,
@@ -108,7 +108,7 @@ export class AnnotationsExporter {
     });
 
     return trimAndDedent`
-      ${formatDateTime(now)}
+      ${formatSortableDateTime(now)}
       ${title}
       ${uri}
       Group: ${groupName}
@@ -135,7 +135,7 @@ export class AnnotationsExporter {
     });
     const annotationToRow = (annotation: APIAnnotationData) =>
       [
-        formatDateTime(new Date(annotation.created)),
+        formatSortableDateTime(new Date(annotation.created)),
         extractUsername(annotation),
         pageLabel(annotation) ?? '',
         uri,
@@ -192,7 +192,9 @@ export class AnnotationsExporter {
           <section>
             <h1>Summary</h1>
             <p>
-              <time dateTime={now.toISOString()}>{formatDateTime(now)}</time>
+              <time dateTime={now.toISOString()}>
+                {formatSortableDateTime(now)}
+              </time>
             </p>
             <p>
               <strong>{title}</strong>
@@ -253,7 +255,9 @@ export class AnnotationsExporter {
                         <td>Created at:</td>
                         <td>
                           <time dateTime={annotation.created}>
-                            {formatDateTime(new Date(annotation.created))}
+                            {formatSortableDateTime(
+                              new Date(annotation.created),
+                            )}
                           </time>
                         </td>
                       </tr>

src/sidebar/services/test/annotations-exporter-test.js

@@ -4,7 +4,7 @@ import {
   newReply,
   publicAnnotation,
 } from '../../test/annotation-fixtures';
-import { formatDateTime } from '../../util/time';
+import { formatSortableDateTime } from '../../util/time';
 import { AnnotationsExporter } from '../annotations-exporter';
 
 describe('AnnotationsExporter', () => {
@@ -30,7 +30,7 @@ describe('AnnotationsExporter', () => {
 
   beforeEach(() => {
     now = new Date();
-    formattedNow = formatDateTime(now);
+    formattedNow = formatSortableDateTime(now);
     baseAnnotation = {
       ...newAnnotation(),
       ...publicAnnotation(),

src/sidebar/util/test/time-test.js

-import { formatDateTime } from '../time';
+import { formatSortableDateTime } from '../time';
 
-describe('sidebar/util/time', () => {
-  describe('formatDateTime', () => {
-    [
-      new Date(Date.UTC(2023, 11, 20, 3, 5, 38)),
-      new Date('2020-05-04T23:02:01+05:00'),
-    ].forEach(date => {
-      it('returns right format for provided date', () => {
-        const expectedDateRegex = /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}$/;
-        assert.match(formatDateTime(date), expectedDateRegex);
-      });
+describe('formatSortableDateTime', () => {
+  [
+    new Date(Date.UTC(2023, 11, 20, 3, 5, 38)),
+    new Date('2020-05-04T23:02:01+05:00'),
+  ].forEach(date => {
+    it('returns right format for provided date', () => {
+      const expectedDateRegex = /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}$/;
+      assert.match(formatSortableDateTime(date), expectedDateRegex);
     });
   });
 });

src/sidebar/util/time.ts

 /**
  * Formats a date as `YYYY-MM-DD hh:mm`, using 24h and system timezone.
+ *
+ * This format has these useful characteristics:
+ * - Easy to read (compared to an ISO date).
+ * - Lexicographic and chronological order match.
+ * - It is detected and correctly parsed as "date" when pasted in common
+ *   spreadsheet editors, making it useful when exporting dates for CSV
+ *   documents.
  */
-export function formatDateTime(date: Date): string {
+export function formatSortableDateTime(date: Date): string {
   const year = date.getFullYear();
   const month = `${date.getMonth() + 1}`.padStart(2, '0');
   const day = `${date.getDate()}`.padStart(2, '0');