fix: Comments from review

packages/docs/content/docs/parsers/demos.tsx

@@ -247,18 +247,20 @@ export function StringLiteralParserDemo() {
 
 export function DateParserDemo({
   queryKey,
-  parser
+  parser,
+  type
 }: {
   queryKey: string
   parser: ParserBuilder<Date>
+  type: 'date' | 'datetime-local'
 }) {
   const [value, setValue] = useQueryState(queryKey, parser)
   return (
     <DemoContainer className="@container" demoKey={queryKey}>
       <div className="flex w-full flex-col items-stretch gap-2 @md:flex-row">
         <div className="flex flex-1 items-center gap-2">
           <input
-            type="datetime-local"
+            type={type}
             className="flex h-10 flex-[2] rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50"
             value={value === null ? '' : value.toISOString().slice(0, -8)}
             onChange={e => {
@@ -292,15 +294,29 @@ export function DateParserDemo({
 }
 
 export function DatetimeISOParserDemo() {
-  return <DateParserDemo queryKey="iso" parser={parseAsIsoDateTime} />
+  return (
+    <DateParserDemo
+      type="datetime-local"
+      queryKey="iso-datetime"
+      parser={parseAsIsoDateTime}
+    />
+  )
 }
 
 export function DateISOParserDemo() {
-  return <DateParserDemo queryKey="iso" parser={parseAsIsoDate} />
+  return (
+    <DateParserDemo type="date" queryKey="iso-date" parser={parseAsIsoDate} />
+  )
 }
 
 export function DateTimestampParserDemo() {
-  return <DateParserDemo queryKey="ts" parser={parseAsTimestamp} />
+  return (
+    <DateParserDemo
+      type="datetime-local"
+      queryKey="ts"
+      parser={parseAsTimestamp}
+    />
+  )
 }
 
 const jsonParserSchema = z.object({

packages/nuqs/src/parsers.test.ts

@@ -55,9 +55,7 @@ describe('parsers', () => {
     const moment = '2020-01-01'
     const ref = new Date(moment)
     expect(parseAsIsoDate.parse(moment)).toStrictEqual(ref)
-    expect(parseAsIsoDate.parse(moment.slice(0, 10))).toStrictEqual(ref)
-    expect(parseAsIsoDate.serialize(ref).length).toBe(10)
-    expect(parseAsIsoDate.serialize(ref).length).not.toContain('T')
+    expect(parseAsIsoDate.serialize(ref)).toEqual(moment)
   })
   test('parseAsArrayOf', () => {
     const parser = parseAsArrayOf(parseAsString)

packages/nuqs/src/parsers.ts

@@ -219,10 +219,13 @@ export const parseAsIsoDateTime = createParser({
  * Querystring encoded as an ISO-8601 string (UTC)
  * without the time zone offset, and returned as
  * a Date object.
+ *
+ * The Date is parsed without the time zone offset,
+ * making it at GMT 00:00:00 UTC.
  */
 export const parseAsIsoDate = createParser({
   parse: v => {
-    const date = new Date(v + 'T00:00:00.000Z')
+    const date = new Date(v.slice(0, 10))
     if (Number.isNaN(date.valueOf())) {
       return null
     }