diff --git a/src/pages/product/ProductStockOperationPopup.vue b/src/pages/product/ProductStockOperationPopup.vue
index 5136239..965f2ca 100644
--- a/src/pages/product/ProductStockOperationPopup.vue
+++ b/src/pages/product/ProductStockOperationPopup.vue
@@ -21,6 +21,25 @@
 				<t-form-item label="数量" required-mark>
 					<t-input v-model="quantity" type="number" align="right" borderless />
 				</t-form-item>
+				<t-form-item label="发生时间" content-align="right">
+					<div class="time-actions">
+						<t-button
+							theme="primary"
+							variant="outline"
+							size="extra-small"
+							:content="occurredAtText || '此刻'"
+							@click="openOccurredAtPicker"
+						/>
+						<t-button
+							v-if="occurredAtText"
+							theme="primary"
+							variant="text"
+							size="extra-small"
+							content="此刻"
+							@click="resetOccurredAt"
+						/>
+					</div>
+				</t-form-item>
 				<t-form-item label="备注" required-mark>
 					<div class="remark-wrap">
 						<t-textarea
@@ -53,6 +72,18 @@
 			</t-form>
 		</div>
 	</bottom-popup>
+	<t-popup v-model="occurredAtPickerVisible" placement="bottom">
+		<t-date-time-picker
+			v-if="occurredAtPickerVisible"
+			v-model="occurredAtDraftText"
+			:start="minimumDateTimeText"
+			:mode="['date', 'minute']"
+			format="YYYY-MM-DD HH:mm"
+			title="库存发生时间"
+			@cancel="occurredAtPickerVisible = false"
+			@confirm="confirmOccurredAt"
+		/>
+	</t-popup>
 	<t-popup
 		v-model="unitPickerVisible"
 		placement="bottom"
@@ -66,6 +97,7 @@
 <script setup lang="ts">
 import { watch } from "vue";
 import { BottomPopup } from "timi-tdesign-mobile";
+import { Time } from "timi-web";
 import ProductAPI from "@/api/ProductAPI";
 import PhotoScroller from "@/components/PhotoScroller.vue";
 import type {
@@ -100,6 +132,9 @@ const isSaving = ref(false);
 const quantity = ref("");
 const remark = ref("");
 const requestNo = ref("");
+const occurredAtText = ref("");
+const occurredAtDraftText = ref("");
+const occurredAtPickerVisible = ref(false);
 const photoItems = ref<PhotoItem[]>([]);
 const photoUrlList = computed(() => photoItems.value.map(item => item.url));
 const selectedUnitId = ref("");
@@ -107,6 +142,7 @@ const unitPickerVisible = ref(false);
 const unitDraft = ref<PickerValue[]>([]);
 const unitPickerZIndex = 12001;
 const unitPickerOverlayZIndex = unitPickerZIndex - 1;
+const minimumDateTimeText = "1970-01-01 00:00";
 
 const isInbound = computed(() => props.operation === "MANUAL_IN" || props.operation === "STOCKTAKE_GAIN");
 const selectableUnits = computed(() => (props.sku.unitList || []).filter(unit => isInbound.value ? unit.allowPurchase : unit.allowSale));
@@ -118,10 +154,28 @@ function resetForm(): void {
 	quantity.value = "";
 	remark.value = "";
 	requestNo.value = "";
+	occurredAtText.value = "";
+	occurredAtDraftText.value = "";
+	occurredAtPickerVisible.value = false;
 	photoItems.value = [];
 	selectedUnitId.value = selectableUnits.value[0]?.id || "";
 }
 
+function openOccurredAtPicker(): void {
+	occurredAtDraftText.value = occurredAtText.value || Time.formatDateTime(new Date());
+	occurredAtPickerVisible.value = true;
+}
+
+function confirmOccurredAt(value?: string | number): void {
+	occurredAtText.value = String(value || occurredAtDraftText.value);
+	occurredAtPickerVisible.value = false;
+}
+
+function resetOccurredAt(): void {
+	occurredAtText.value = "";
+	occurredAtDraftText.value = "";
+}
+
 function openUnitPicker(): void {
 	if (selectableUnits.value.length) {
 		unitDraft.value = [selectedUnitId.value];
@@ -170,11 +224,20 @@ function buildRequest(): ProductStockChangeRequest {
 		skuId: props.sku.id || "",
 		skuUnitId: selectedUnitId.value,
 		quantity: quantity.value,
+		occurredAt: resolveTimestamp(occurredAtText.value),
 		remark: remark.value.trim(),
 		attachmentList: photoItems.value.flatMap(item => item.tempFileId ? [{ tempFileId: item.tempFileId, attachType: item.attachType || "PHOTO" }] : [])
 	};
 }
 
+function resolveTimestamp(value: string): number | undefined {
+	if (!value) {
+		return undefined;
+	}
+	const timestamp = new Date(value.replace(" ", "T")).getTime();
+	return Number.isFinite(timestamp) ? timestamp : undefined;
+}
+
 async function submit(): Promise<void> {
 	if (isSaving.value || !validate()) {
 		return;
@@ -227,5 +290,12 @@ watch(() => [visible.value, props.operation] as const, ([isVisible]) => {
 		align-items: start;
 		justify-content: space-between;
 	}
+
+	.time-actions {
+		gap: .5rem;
+		display: flex;
+		align-items: center;
+		justify-content: flex-end;
+	}
 }
 </style>
diff --git a/src/types/Product.ts b/src/types/Product.ts
index c739331..6819ccf 100644
--- a/src/types/Product.ts
+++ b/src/types/Product.ts
@@ -195,6 +195,7 @@ export type ProductStockChangeRequest = {
 	skuId: string;
 	skuUnitId: string;
 	quantity: number | string;
+	occurredAt?: number;
 	remark: string;
 	attachmentList: Partial<Attachment>[];
 };