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diff --git a/src/data/composite/wiki-data/processContentEntryDates.js b/src/data/composite/wiki-data/processContentEntryDates.js
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+++ b/src/data/composite/wiki-data/processContentEntryDates.js
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+import {input, templateCompositeFrom} from '#composite';
+import {stitchArrays} from '#sugar';
+import {isContentString, isString, looseArrayOf} from '#validators';
+
+import {fillMissingListItems} from '#composite/data';
+
+// Important note: These two kinds of inputs have the exact same shape!!
+// This isn't on purpose (besides that they *are* both supposed to be strings).
+// They just don't have any more particular validation, yet.
+
+const inputDateList = defaultDependency =>
+  input({
+    validate: looseArrayOf(isString),
+    defaultDependency,
+  });
+
+const inputKindList = defaultDependency =>
+  input.staticDependency({
+    validate: looseArrayOf(isString),
+    defaultDependency: defaultDependency,
+  });
+
+export default templateCompositeFrom({
+  annotation: `processContentEntryDates`,
+
+  inputs: {
+    annotations: input({
+      validate: looseArrayOf(isContentString),
+      defaultDependency: '#entries.annotation',
+    }),
+
+    dates: inputDateList('#entries.date'),
+    secondDates: inputDateList('#entries.secondDate'),
+    accessDates: inputDateList('#entries.accessDate'),
+
+    dateKinds: inputKindList('#entries.dateKind'),
+    accessKinds: inputKindList('#entries.accessKind'),
+  },
+
+  outputs: ({
+    [input.staticDependency('dates')]: dates,
+    [input.staticDependency('secondDates')]: secondDates,
+    [input.staticDependency('accessDates')]: accessDates,
+    [input.staticDependency('dateKinds')]: dateKinds,
+    [input.staticDependency('accessKinds')]: accessKinds,
+  }) => [
+    dates ?? '#processedContentEntryDates',
+    secondDates ?? '#processedContentEntrySecondDates',
+    accessDates ?? '#processedContentEntryAccessDates',
+    dateKinds ?? '#processedContentEntryDateKinds',
+    accessKinds ?? '#processedContentEntryAccessKinds',
+  ],
+
+  steps: () => [
+    {
+      dependencies: [input('annotations')],
+      compute: (continuation, {
+        [input('annotations')]: annotations,
+      }) => continuation({
+        ['#webArchiveDates']:
+          annotations
+            .map(text => text?.match(/https?:\/\/web.archive.org\/web\/([0-9]{8,8})[0-9]*\//))
+            .map(match => match?.[1])
+            .map(dateText =>
+              (dateText
+                ? dateText.slice(0, 4) + '/' +
+                  dateText.slice(4, 6) + '/' +
+                  dateText.slice(6, 8)
+                : null)),
+      }),
+    },
+
+    {
+      dependencies: [input('dates')],
+      compute: (continuation, {
+        [input('dates')]: dates,
+      }) => continuation({
+        ['#processedContentEntryDates']:
+          dates
+            .map(date => date ? new Date(date) : null),
+      }),
+    },
+
+    {
+      dependencies: [input('secondDates')],
+      compute: (continuation, {
+        [input('secondDates')]: secondDates,
+      }) => continuation({
+        ['#processedContentEntrySecondDates']:
+          secondDates
+            .map(date => date ? new Date(date) : null),
+      }),
+    },
+
+    fillMissingListItems({
+      list: input('dateKinds'),
+      fill: input.value(null),
+    }).outputs({
+      '#list': '#processedContentEntryDateKinds',
+    }),
+
+    {
+      dependencies: [input('accessDates'), '#webArchiveDates'],
+      compute: (continuation, {
+        [input('accessDates')]: accessDates,
+        ['#webArchiveDates']: webArchiveDates,
+      }) => continuation({
+        ['#processedContentEntryAccessDates']:
+          stitchArrays({
+            accessDate: accessDates,
+            webArchiveDate: webArchiveDates
+          }).map(({accessDate, webArchiveDate}) =>
+              accessDate ??
+              webArchiveDate ??
+              null)
+            .map(date => date ? new Date(date) : date),
+      }),
+    },
+
+    {
+      dependencies: [input('accessKinds'), '#webArchiveDates'],
+      compute: (continuation, {
+        [input('accessKinds')]: accessKinds,
+        ['#webArchiveDates']: webArchiveDates,
+      }) => continuation({
+        ['#processedContentEntryAccessKinds']:
+          stitchArrays({
+            accessKind: accessKinds,
+            webArchiveDate: webArchiveDates,
+          }).map(({accessKind, webArchiveDate}) =>
+              accessKind ??
+              (webArchiveDate && 'captured') ??
+              null),
+      }),
+    },
+
+    // TODO: Annoying conversion step for outputs, would be nice to avoid.
+    {
+      dependencies: [
+        '#processedContentEntryDates',
+        '#processedContentEntrySecondDates',
+        '#processedContentEntryAccessDates',
+        '#processedContentEntryDateKinds',
+        '#processedContentEntryAccessKinds',
+        input.staticDependency('dates'),
+        input.staticDependency('secondDates'),
+        input.staticDependency('accessDates'),
+        input.staticDependency('dateKinds'),
+        input.staticDependency('accessKinds'),
+      ],
+
+      compute: (continuation, {
+        ['#processedContentEntryDates']: processedContentEntryDates,
+        ['#processedContentEntrySecondDates']: processedContentEntrySecondDates,
+        ['#processedContentEntryAccessDates']: processedContentEntryAccessDates,
+        ['#processedContentEntryDateKinds']: processedContentEntryDateKinds,
+        ['#processedContentEntryAccessKinds']: processedContentEntryAccessKinds,
+        [input.staticDependency('dates')]: dates,
+        [input.staticDependency('secondDates')]: secondDates,
+        [input.staticDependency('accessDates')]: accessDates,
+        [input.staticDependency('dateKinds')]: dateKinds,
+        [input.staticDependency('accessKinds')]: accessKinds,
+      }) => continuation({
+        [dates ?? '#processedContentEntryDates']:
+          processedContentEntryDates,
+
+        [secondDates ?? '#processedContentEntrySecondDates']:
+          processedContentEntrySecondDates,
+
+        [accessDates ?? '#processedContentEntryAccessDates']:
+          processedContentEntryAccessDates,
+
+        [dateKinds ?? '#processedContentEntryDateKinds']:
+          processedContentEntryDateKinds,
+
+        [accessKinds ?? '#processedContentEntryAccessKinds']:
+          processedContentEntryAccessKinds,
+      }),
+    },
+  ],
+});