Date precision (#6359)

* Remove month/year only formats from ParseDateStringAsTime
* Add precision field to Date and handle parsing year/month-only dates
* Add date precision columns for date columns
* Adjust UI to account for fuzzy dates

ui/v2.5/src/components/Shared/Date.tsx

@@ -0,0 +1,36 @@
+import React from "react";
+import { FormattedDate as IntlDate } from "react-intl";
+import { PatchComponent } from "src/patch";
+
+// wraps FormattedDate to handle year or year/month dates
+export const FormattedDate: React.FC<{
+  value: string | number | Date | undefined;
+}> = PatchComponent("Date", ({ value }) => {
+  if (typeof value === "string") {
+    // try parsing as year or year/month
+    const yearMatch = value.match(/^(\d{4})$/);
+    if (yearMatch) {
+      const year = parseInt(yearMatch[1], 10);
+      return (
+        <IntlDate value={Date.UTC(year, 0)} year="numeric" timeZone="utc" />
+      );
+    }
+
+    const yearMonthMatch = value.match(/^(\d{4})-(\d{2})$/);
+    if (yearMonthMatch) {
+      const year = parseInt(yearMonthMatch[1], 10);
+      const month = parseInt(yearMonthMatch[2], 10) - 1;
+
+      return (
+        <IntlDate
+          value={Date.UTC(year, month)}
+          year="numeric"
+          month="long"
+          timeZone="utc"
+        />
+      );
+    }
+  }
+
+  return <IntlDate value={value} format="long" timeZone="utc" />;
+});