packages/example/src/lib/schema/datetime.ts

@@ -0,0 +1,32 @@
+import { DateTime, identity, ParseResult, Schema } from "effect"
+
+
+export const DateTimeUtcFromZoned = Schema.transformOrFail(
+    Schema.DateTimeZonedFromSelf,
+    Schema.DateTimeUtcFromSelf,
+    {
+        strict: true,
+        encode: DateTime.setZoneCurrent,
+        decode: zoned => ParseResult.succeed(DateTime.toUtc(zoned)),
+    },
+)
+
+export const DateTimeZonedFromUtc = Schema.transformOrFail(
+    Schema.DateTimeUtcFromSelf,
+    Schema.DateTimeZonedFromSelf,
+    {
+        strict: true,
+        encode: zoned => ParseResult.succeed(DateTime.toUtc(zoned)),
+        decode: DateTime.setZoneCurrent,
+    },
+)
+
+export const DateTimeUtcFromZonedInput = Schema.transform(
+    Schema.String,
+    Schema.compose(Schema.DateTimeZoned, DateTimeUtcFromZoned),
+    {
+        strict: true,
+        encode: v => v.slice(0, 16),
+        decode: identity,
+    },
+)

packages/example/src/lib/schema/index.ts

@@ -0,0 +1 @@
+export * from "./datetime"

packages/example/src/runtime.ts

@@ -1,10 +1,11 @@
 import { FetchHttpClient } from "@effect/platform"
 import { Clipboard, Geolocation, Permissions } from "@effect/platform-browser"
-import { Layer } from "effect"
+import { DateTime, Layer } from "effect"
 import { ReactManagedRuntime } from "effect-fc"
 
 
 export const AppLive = Layer.empty.pipe(
+    Layer.provideMerge(DateTime.layerCurrentZoneLocal),
     Layer.provideMerge(Clipboard.layer),
     Layer.provideMerge(Geolocation.layer),
     Layer.provideMerge(Permissions.layer),

packages/example/src/todo/Todo.tsx

@@ -1,4 +1,5 @@
 import * as Domain from "@/domain"
+import { DateTimeUtcFromZonedInput } from "@/lib/schema"
 import { TextAreaInput } from "@/lib/TextAreaInput"
 import { TextFieldInput } from "@/lib/TextFieldInput"
 import { Box, Button, Flex, IconButton } from "@radix-ui/themes"
@@ -13,7 +14,7 @@ import { TodosState } from "./TodosState.service"
 
 
 const StringTextAreaInput = TextAreaInput({ schema: Schema.String })
-const OptionalDateInput = TextFieldInput({ optional: true, schema: Schema.DateTimeUtc })
+const OptionalDateInput = TextFieldInput({ optional: true, schema: DateTimeUtcFromZonedInput })
 
 const makeTodo = makeUuid4.pipe(
     Effect.map(id => Domain.Todo.Todo.make({
@@ -58,7 +59,10 @@ export class Todo extends Component.makeUntraced(function* Todo(props: TodoProps
                     <StringTextAreaInputFC ref={contentRef} />
 
                     <Flex direction="row" justify="center" align="center" gap="2">
-                        <OptionalDateInputFC ref={completedAtRef} />
+                        <OptionalDateInputFC
+                            ref={completedAtRef}
+                            type="datetime-local"
+                        />
 
                         {props._tag === "new" &&
                             <Button