feat(timestamp): Parse number-like dates plus offset (#33647)

lib/util/timestamp.spec.ts

@@ -17,6 +17,8 @@ describe('util/timestamp', () => {
       ${'2021-01-01'}                              | ${'2021-01-01T00:00:00.000Z'}
       ${'20210101000000'}                          | ${'2021-01-01T00:00:00.000Z'}
       ${'20211231235959'}                          | ${'2021-12-31T23:59:59.000Z'}
+      ${'20210101000000+0000'}                     | ${'2021-01-01T00:00:00.000Z'}
+      ${'20211231235959+0000'}                     | ${'2021-12-31T23:59:59.000Z'}
       ${'Jan 1, 2021'}                             | ${'2021-01-01T00:00:00.000Z'}
       ${'2021/01/01'}                              | ${'2021-01-01T00:00:00.000Z'}
       ${'2021-01-02T00:00:00+05:30'}               | ${'2021-01-01T18:30:00.000Z'}

lib/util/timestamp.ts

@@ -64,6 +64,15 @@ export function asTimestamp(input: unknown): Timestamp | null {
       return numberLikeDate.toISO() as Timestamp;
     }
 
+    const numberLikeOffsetDate = DateTime.fromFormat(
+      input,
+      'yyyyMMddHHmmssZZZ',
+      { zone: 'UTC' },
+    );
+    if (isValid(numberLikeOffsetDate)) {
+      return numberLikeOffsetDate.toISO() as Timestamp;
+    }
+
     const fallbackDate = DateTime.fromMillis(
       Date.parse(input) - timezoneOffset,
       { zone: 'UTC' },