fix: parse dates with years before 100 correctly

.changeset/fix-date-year-before-100.md

@@ -0,0 +1,5 @@
+---
+'@electric-sql/pglite': patch
+---
+
+Fix `date` / `timestamp` / `timestamptz` values with a year before 100 being parsed as 19xx/20xx. PostgreSQL emits such years as e.g. `0050-06-15 12:30:00+00`, which is not strict ISO 8601, so `new Date()` fell back to its legacy parser and mapped the year into the 1900s (or returned `Invalid Date`). For example `0050` became `1950` and `0001` became `2015`. The text is now normalized to ISO 8601 before parsing; years 100 and above are unaffected.

packages/pglite/src/types.ts

@@ -153,7 +153,13 @@ export const types = {
         throw new Error('Invalid input for date type')
       }
     },
-    parse: (x: string | number) => new Date(x),
+    parse: (x: string | number) => {
+      if (typeof x === 'string') {
+        const iso = x.replace(' ', 'T')
+        return new Date(iso === x ? x : iso.replace(/([+-]\d{2})$/, '$1:00'))
+      }
+      return new Date(x)
+    },
   },
   bytea: {
     to: BYTEA,

packages/pglite/tests/types.test.ts

@@ -66,6 +66,12 @@ describe('parse', () => {
     ).toEqual(new Date('2021-01-01T12:00:00.000Z').getUTCMilliseconds())
   })
 
+  it('timestamptz 1184 before year 100', () => {
+    expect(types.parseType('0050-06-15 12:30:00+00', 1184)).toEqual(
+      new Date('0050-06-15T12:30:00.000Z'),
+    )
+  })
+
   it('bytea 17', () => {
     expect(types.parseType('\\x010203', 17)).toEqual(Uint8Array.from([1, 2, 3]))
   })