fix(orm): coerce ISO strings on DateTime input, with strictDateInput opt-in (#2631)

packages/orm/src/client/options.ts

@@ -202,6 +202,16 @@ export type ClientOptions<Schema extends SchemaDef> = QueryOptions<Schema> & {
      */
     validateInput?: boolean;
 
+    /**
+     * Whether to require `Date` objects (rather than ISO strings) for `DateTime` field inputs. Defaults
+     * to `false`, matching Prisma's longstanding behavior of coercing ISO strings — including bare
+     * time-only strings like `"09:00:00"` for `@db.Time` fields — to `Date`.
+     *
+     * Set to `true` to opt into strict input validation that rejects all string forms.
+     * @see https://github.com/zenstackhq/zenstack/issues/2631
+     */
+    strictDateInput?: boolean;
+
     /**
      * Whether to use compact alias names (e.g., "$$t1", "$$t2") when transforming ORM queries to SQL.
      * Defaults to `true`.

packages/orm/src/client/zod/factory.ts

@@ -84,6 +84,29 @@ export function createQuerySchemaFactory(clientOrSchema: any, options?: any) {
     return new ZodSchemaFactory(clientOrSchema, options);
 }
 
+/**
+ * Builds a `DateTime` value schema that accepts a `Date` object or an ISO
+ * datetime / date / time-only string and coerces it to a `Date`. Time-only
+ * strings (e.g. `"09:00:00"` for `@db.Time` fields) are anchored to the Unix
+ * epoch. Strings that don't parse fall through and are rejected by `z.date()`
+ * with the standard error.
+ *
+ * Used when `ClientOptions.strictDateInput` is left at its default (`false`).
+ * @see https://github.com/zenstackhq/zenstack/issues/2631
+ */
+export function coercedDateTimeSchema(): ZodType {
+    return z.preprocess((val) => {
+        if (typeof val !== 'string') return val;
+        if (/^\d{2}:\d{2}(?::\d{2}(?:\.\d+)?)?(?:Z|[+-]\d\d(?::\d\d)?)?$/.test(val)) {
+            const hasTz = val.endsWith('Z') || /[+-]\d\d(?::\d\d)?$/.test(val);
+            const d = new Date(`1970-01-01T${val}${hasTz ? '' : 'Z'}`);
+            return isNaN(d.getTime()) ? val : d;
+        }
+        const d = new Date(val);
+        return isNaN(d.getTime()) ? val : d;
+    }, z.date());
+}
+
 /**
  * Options for creating Zod schemas.
  */
@@ -854,7 +877,10 @@ export class ZodSchemaFactory<
 
     @cache()
     private makeDateTimeValueSchema(): ZodType {
-        const schema = z.union([z.iso.datetime(), z.iso.date(), z.date()]);
+        // Strict mode: require an actual `Date` instance, matching what the
+        // engine ultimately wants. Default mode: coerce ISO strings (datetime,
+        // date, time-only) to `Date` for Prisma compatibility (#2631).
+        const schema = (this.options as ClientOptions<Schema>)?.strictDateInput ? z.date() : coercedDateTimeSchema();
         this.registerSchema('DateTime', schema);
         return schema;
     }

tests/regression/test/issue-2631.test.ts

@@ -0,0 +1,78 @@
+import { createTestClient } from '@zenstackhq/testtools';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+
+// Regression for #2631: ZenStack 3.5+ replaced Prisma's permissive
+// datetime input coercion with a strict zod union, breaking every caller
+// that passed ISO strings to `DateTime` fields. The default behaviour now
+// coerces strings; `ClientOptions.strictDateInput: true` opts back in to
+// the strict semantics.
+describe('Issue 2631 — strictDateInput option', () => {
+    const schema = `
+model Event {
+    id      Int      @id @default(autoincrement())
+    label   String
+    when    DateTime
+}
+    `;
+
+    describe('default (strictDateInput unset / false)', () => {
+        let db: any;
+
+        beforeEach(async () => {
+            db = await createTestClient(schema, { usePrismaPush: true, provider: 'sqlite' });
+        });
+        afterEach(async () => db?.$disconnect());
+
+        it('accepts a Date object', async () => {
+            const e = await db.event.create({ data: { label: 'date', when: new Date('2024-01-15T10:30:00Z') } });
+            expect(e.when).toBeInstanceOf(Date);
+        });
+
+        it('accepts an ISO datetime string and coerces to Date', async () => {
+            const e = await db.event.create({ data: { label: 'iso', when: '2024-01-15T10:30:00.000Z' } });
+            expect(e.when).toBeInstanceOf(Date);
+        });
+
+        it('accepts an ISO date string and coerces to Date', async () => {
+            const e = await db.event.create({ data: { label: 'date-only', when: '2024-01-15' } });
+            expect(e.when).toBeInstanceOf(Date);
+        });
+
+        it('accepts a bare time-only string anchored to the Unix epoch', async () => {
+            const e = await db.event.create({ data: { label: 'time-only', when: '09:30:00' } });
+            expect(e.when).toBeInstanceOf(Date);
+            expect((e.when as Date).getUTCHours()).toBe(9);
+            expect((e.when as Date).getUTCMinutes()).toBe(30);
+        });
+
+        it('rejects a non-parseable string', async () => {
+            await expect(db.event.create({ data: { label: 'junk', when: 'not-a-date' as any } })).rejects.toThrow();
+        });
+    });
+
+    describe('strictDateInput: true', () => {
+        let db: any;
+
+        beforeEach(async () => {
+            db = await createTestClient(schema, { usePrismaPush: true, provider: 'sqlite', strictDateInput: true });
+        });
+        afterEach(async () => db?.$disconnect());
+
+        it('accepts a Date object', async () => {
+            const e = await db.event.create({ data: { label: 'date', when: new Date('2024-01-15T10:30:00Z') } });
+            expect(e.when).toBeInstanceOf(Date);
+        });
+
+        it('rejects an ISO datetime string', async () => {
+            await expect(db.event.create({ data: { label: 'iso', when: '2024-01-15T10:30:00.000Z' as any } })).rejects.toThrow();
+        });
+
+        it('rejects an ISO date string', async () => {
+            await expect(db.event.create({ data: { label: 'date-only', when: '2024-01-15' as any } })).rejects.toThrow();
+        });
+
+        it('rejects a bare time-only string', async () => {
+            await expect(db.event.create({ data: { label: 'time-only', when: '09:30:00' as any } })).rejects.toThrow();
+        });
+    });
+});