diff --git a/apps/edr-freight-web/backoffice/src/components/contracts/ExportClearanceStepper.tsx b/apps/edr-freight-web/backoffice/src/components/contracts/ExportClearanceStepper.tsx
index dc59c4dfc..c94e005ae 100644
--- a/apps/edr-freight-web/backoffice/src/components/contracts/ExportClearanceStepper.tsx
+++ b/apps/edr-freight-web/backoffice/src/components/contracts/ExportClearanceStepper.tsx
@@ -50,6 +50,13 @@ import {
 import { contractsService } from "@/services/contracts.service";
 import { bookingsService } from "@/services/bookings.service";
 
+/** Today as `yyyy-MM-dd` in the browser's local zone (a DateInput `minDate`). */
+function todayISODate(): string {
+  const now = new Date();
+  const tz = now.getTimezoneOffset() * 60000;
+  return new Date(now.getTime() - tz).toISOString().slice(0, 10);
+}
+
 /**
  * Export customs flow, ordered per the stakeholder process:
  * customer docs → RO (DJ) → declaration (ET, auto-releases) → create booking (ET)
@@ -937,6 +944,7 @@ export function ReleaseOrderCard({
   );
   const [loading, setLoading] = useState(false);
   const [amendLoading, setAmendLoading] = useState(false);
+  const minVesselDate = useMemo(todayISODate, []);
 
   return (
     <Paper withBorder radius="md" p="md">
@@ -949,6 +957,7 @@ export function ReleaseOrderCard({
           label="Vessel departure date"
           value={vesselDate}
           onChange={(v) => setVesselDate(v ? new Date(v) : null)}
+          minDate={minVesselDate}
           size="sm"
         />
         <Group>
diff --git a/apps/edr-freight-web/backoffice/src/components/contracts/GlClearanceUploadModal.tsx b/apps/edr-freight-web/backoffice/src/components/contracts/GlClearanceUploadModal.tsx
index 87a8993ee..1953796dd 100644
--- a/apps/edr-freight-web/backoffice/src/components/contracts/GlClearanceUploadModal.tsx
+++ b/apps/edr-freight-web/backoffice/src/components/contracts/GlClearanceUploadModal.tsx
@@ -1,4 +1,4 @@
-import { useState } from "react";
+import { useMemo, useState } from "react";
 import { Button, Group, Modal, Stack, Text } from "@mantine/core";
 import { DateInput } from "@mantine/dates";
 import { Ship, Upload } from "lucide-react";
@@ -40,6 +40,13 @@ export function GlClearanceUploadModal({
     vesselDepartureDate ? new Date(vesselDepartureDate) : null,
   );
   const [loading, setLoading] = useState(false);
+  // Earliest selectable vessel date (today, local) — refreshed on each open.
+  const todayISODate = useMemo(() => {
+    if (!opened) return undefined;
+    const now = new Date();
+    const tz = now.getTimezoneOffset() * 60000;
+    return new Date(now.getTime() - tz).toISOString().slice(0, 10);
+  }, [opened]);
 
   const isDo = kind === "do";
   const isRo = kind === "ro";
@@ -115,6 +122,7 @@ export function GlClearanceUploadModal({
             label="Vessel departure date"
             value={vesselDate}
             onChange={(v) => setVesselDate(v ? new Date(v) : null)}
+            minDate={todayISODate}
             size="sm"
             required
           />
@@ -123,6 +131,7 @@ export function GlClearanceUploadModal({
             label="Vessel arrival date (optional)"
             value={vesselDate}
             onChange={(v) => setVesselDate(v ? new Date(v) : null)}
+            minDate={todayISODate}
             size="sm"
             clearable
           />
diff --git a/apps/edr-freight-web/backoffice/src/components/trainScheduling/EditScheduleDateModal.tsx b/apps/edr-freight-web/backoffice/src/components/trainScheduling/EditScheduleDateModal.tsx
index 6ea7dfc5b..c173614dc 100644
--- a/apps/edr-freight-web/backoffice/src/components/trainScheduling/EditScheduleDateModal.tsx
+++ b/apps/edr-freight-web/backoffice/src/components/trainScheduling/EditScheduleDateModal.tsx
@@ -67,9 +67,13 @@ export default function EditScheduleDateModal({
   );
 
   const [value, setValue] = useState("");
+  // Earliest selectable departure, refreshed each time the modal opens.
+  const [minValue, setMinValue] = useState("");
 
   useEffect(() => {
-    if (opened) setValue(toLocalInputValue(currentDate));
+    if (!opened) return;
+    setValue(toLocalInputValue(currentDate));
+    setMinValue(toLocalInputValue(new Date().toISOString()));
   }, [opened, currentDate]);
 
   const handleSave = async () => {
@@ -77,6 +81,13 @@ export default function EditScheduleDateModal({
       toast({ title: "Pick a departure date", variant: "destructive" });
       return;
     }
+    if (new Date(value).getTime() < Date.now()) {
+      toast({
+        title: "Departure date must be in the future",
+        variant: "destructive",
+      });
+      return;
+    }
     try {
       await save.mutateAsync({
         id: scheduleId,
@@ -124,6 +135,7 @@ export default function EditScheduleDateModal({
         <TextInput
           label="Departure date"
           type="datetime-local"
+          min={minValue}
           value={value}
           onChange={(e) => setValue(e.currentTarget.value)}
         />
diff --git a/apps/edr-freight-web/backoffice/src/components/trainScheduling/RescheduleTrainDialog.tsx b/apps/edr-freight-web/backoffice/src/components/trainScheduling/RescheduleTrainDialog.tsx
index d0f670e51..271603bca 100644
--- a/apps/edr-freight-web/backoffice/src/components/trainScheduling/RescheduleTrainDialog.tsx
+++ b/apps/edr-freight-web/backoffice/src/components/trainScheduling/RescheduleTrainDialog.tsx
@@ -1,9 +1,19 @@
-import { useState } from "react";
+import { useMemo, useState } from "react";
 import { Button, Group, Modal, Stack, Text, TextInput, Textarea } from "@mantine/core";
 import toast from "react-hot-toast";
 
 import { trainSchedulingService } from "@/services/trainScheduling.service";
 
+/** `min` for a `datetime-local` input: now, in the browser's local zone. */
+function nowLocalDateTime(): string {
+  const now = new Date();
+  const pad = (n: number) => String(n).padStart(2, "0");
+  return (
+    `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())}` +
+    `T${pad(now.getHours())}:${pad(now.getMinutes())}`
+  );
+}
+
 export function RescheduleTrainDialog({
   scheduleId,
   currentBookingIds,
@@ -20,12 +30,21 @@ export function RescheduleTrainDialog({
   const [newDepartureDate, setNewDepartureDate] = useState("");
   const [reason, setReason] = useState("");
   const [loading, setLoading] = useState(false);
+  // Earliest selectable departure, refreshed each time the dialog opens.
+  const minDepartureDate = useMemo(
+    () => (opened ? nowLocalDateTime() : ""),
+    [opened],
+  );
 
   const handleSubmit = async () => {
     if (!newDepartureDate) {
       toast.error("Select a new departure date");
       return;
     }
+    if (new Date(newDepartureDate).getTime() < Date.now()) {
+      toast.error("New departure must be in the future");
+      return;
+    }
     setLoading(true);
     try {
       await trainSchedulingService.maintenanceReschedule(scheduleId, {
@@ -53,6 +72,7 @@ export function RescheduleTrainDialog({
         <TextInput
           label="New departure"
           type="datetime-local"
+          min={minDepartureDate}
           value={newDepartureDate}
           onChange={(e) => setNewDepartureDate(e.target.value)}
         />
diff --git a/apps/edr-freight-web/backoffice/src/pages/trainScheduling/TrainScheduleV2ListPage.tsx b/apps/edr-freight-web/backoffice/src/pages/trainScheduling/TrainScheduleV2ListPage.tsx
index 14432d8ed..859efece1 100644
--- a/apps/edr-freight-web/backoffice/src/pages/trainScheduling/TrainScheduleV2ListPage.tsx
+++ b/apps/edr-freight-web/backoffice/src/pages/trainScheduling/TrainScheduleV2ListPage.tsx
@@ -55,6 +55,13 @@ import { useToast } from "@/hooks/use-toast";
 import type { TrainScheduleListItem } from "@/types/trainScheduling";
 import { DataTable, DataTableFooter, usePagination } from "@edr/ui-common";
 
+/** `min` for a `datetime-local` input: now, in the browser's local zone. */
+const nowLocalDateTime = () => {
+  const now = new Date();
+  now.setMinutes(now.getMinutes() - now.getTimezoneOffset());
+  return now.toISOString().slice(0, 16);
+};
+
 const splitDate = (value?: string | null) => {
   if (!value) return { day: "—", time: "" };
   const date = new Date(value);
@@ -103,6 +110,12 @@ export default function TrainScheduleV2ListPage() {
   const [routeId, setRouteId] = useState("");
   const [scheduleDate, setScheduleDate] = useState("");
   const [locomotiveIds, setLocomotiveIds] = useState<string[]>([]);
+  // Recomputed each time the create modal opens so a long-lived tab can't keep
+  // offering a stale "now" as the earliest selectable departure.
+  const minScheduleDate = useMemo(
+    () => (createOpen ? nowLocalDateTime() : ""),
+    [createOpen],
+  );
 
   const schedulesQuery = useQuery(
     api.trainScheduling.scheduleList.queryOptions({ input: {} }),
@@ -443,6 +456,13 @@ export default function TrainScheduleV2ListPage() {
       });
       return;
     }
+    if (new Date(scheduleDate).getTime() < Date.now()) {
+      toast({
+        title: "Departure date must be in the future",
+        variant: "destructive",
+      });
+      return;
+    }
     try {
       const created = await create.mutateAsync({
         payload: {
@@ -691,6 +711,7 @@ export default function TrainScheduleV2ListPage() {
           <TextInput
             label="Departure date"
             type="datetime-local"
+            min={minScheduleDate}
             value={scheduleDate}
             onChange={(e) => setScheduleDate(e.currentTarget.value)}
           />