fix(expiry): show delayed-start countdown in subscribe and client info (#4535)

A client with "start after first use" expiry stores the duration as a
negative number of milliseconds (e.g. -86400000 = 1 day after first
connect). The clients page row already renders this correctly as
"Delayed start: 1d", but two other surfaces treated negative values as
zero and rendered them as unlimited:

- Subscription header: the index==0 / index>0 branches in subService,
  subClashService and subJsonService only carried ExpiryTime forward
  when > 0, so traffic.ExpiryTime stayed at zero and the header sent
  expire=0. Every imported client appeared to have no expiry, and the
  built-in subscribe page rendered the "unlimited" tag.

- ClientInfoModal: both the expiryLabel helper and the rendering check
  treated <= 0 as the "no expiry" branch, so the modal showed an
  infinity tag instead of "Delayed start: Nd".

Add subscriptionExpiryFromClient to map negative durations onto a
"now + |value|" timestamp so subscription clients see an actual expiry
they can count down from. Update ClientInfoModal's helper and render
to match the clients-page convention.

Regression test in subService_test.go covers the helper.

Refs #4535

frontend/src/pages/clients/ClientInfoModal.tsx

@@ -40,9 +40,16 @@ export default function ClientInfoModal({
   onOpenChange,
 }: ClientInfoModalProps) {
   const { datepicker } = useDatepicker();
-  const expiryLabel = (ts?: number) => (!ts || ts <= 0 ? '∞' : IntlUtil.formatDate(ts, datepicker));
-  const dateLabel = (ts?: number) => (!ts || ts <= 0 ? '-' : IntlUtil.formatDate(ts, datepicker));
   const { t } = useTranslation();
+  const expiryLabel = (ts?: number) => {
+    if (!ts) return '∞';
+    if (ts < 0) {
+      const days = Math.round(ts / -86400000);
+      return `${t('pages.clients.delayedStart')}: ${days}d`;
+    }
+    return IntlUtil.formatDate(ts, datepicker);
+  };
+  const dateLabel = (ts?: number) => (!ts || ts <= 0 ? '-' : IntlUtil.formatDate(ts, datepicker));
   const [messageApi, messageContextHolder] = message.useMessage();
   const [links, setLinks] = useState<string[]>([]);
 
@@ -195,9 +202,9 @@ export default function ClientInfoModal({
               <tr>
                 <td>{t('pages.inbounds.expireDate')}</td>
                 <td>
-                  {!client.expiryTime || client.expiryTime <= 0
+                  {!client.expiryTime
                     ? <Tag color="purple">∞</Tag>
-                    : <Tag>{expiryLabel(client.expiryTime)}</Tag>}
+                    : <Tag color={client.expiryTime < 0 ? 'blue' : undefined}>{expiryLabel(client.expiryTime)}</Tag>}
                   {(client.expiryTime ?? 0) > 0 && (
                     <span className="hint">{IntlUtil.formatRelativeTime(client.expiryTime)}</span>
                   )}

sub/subClashService.go

@@ -68,9 +68,7 @@ func (s *SubClashService) GetClash(subId string, host string) (string, string, e
 			traffic.Up = clientTraffic.Up
 			traffic.Down = clientTraffic.Down
 			traffic.Total = clientTraffic.Total
-			if clientTraffic.ExpiryTime > 0 {
-				traffic.ExpiryTime = clientTraffic.ExpiryTime
-			}
+			traffic.ExpiryTime = subscriptionExpiryFromClient(clientTraffic.ExpiryTime)
 		} else {
 			traffic.Up += clientTraffic.Up
 			traffic.Down += clientTraffic.Down
@@ -79,7 +77,8 @@ func (s *SubClashService) GetClash(subId string, host string) (string, string, e
 			} else {
 				traffic.Total += clientTraffic.Total
 			}
-			if clientTraffic.ExpiryTime != traffic.ExpiryTime {
+			normalized := subscriptionExpiryFromClient(clientTraffic.ExpiryTime)
+			if normalized != traffic.ExpiryTime {
 				traffic.ExpiryTime = 0
 			}
 		}

sub/subJsonService.go

@@ -130,9 +130,7 @@ func (s *SubJsonService) GetJson(subId string, host string) (string, string, err
 			traffic.Up = clientTraffic.Up
 			traffic.Down = clientTraffic.Down
 			traffic.Total = clientTraffic.Total
-			if clientTraffic.ExpiryTime > 0 {
-				traffic.ExpiryTime = clientTraffic.ExpiryTime
-			}
+			traffic.ExpiryTime = subscriptionExpiryFromClient(clientTraffic.ExpiryTime)
 		} else {
 			traffic.Up += clientTraffic.Up
 			traffic.Down += clientTraffic.Down
@@ -141,7 +139,8 @@ func (s *SubJsonService) GetJson(subId string, host string) (string, string, err
 			} else {
 				traffic.Total += clientTraffic.Total
 			}
-			if clientTraffic.ExpiryTime != traffic.ExpiryTime {
+			normalized := subscriptionExpiryFromClient(clientTraffic.ExpiryTime)
+			if normalized != traffic.ExpiryTime {
 				traffic.ExpiryTime = 0
 			}
 		}

sub/subService.go

@@ -114,9 +114,7 @@ func (s *SubService) GetSubs(subId string, host string) ([]string, int64, xray.C
 			traffic.Up = clientTraffic.Up
 			traffic.Down = clientTraffic.Down
 			traffic.Total = clientTraffic.Total
-			if clientTraffic.ExpiryTime > 0 {
-				traffic.ExpiryTime = clientTraffic.ExpiryTime
-			}
+			traffic.ExpiryTime = subscriptionExpiryFromClient(clientTraffic.ExpiryTime)
 		} else {
 			traffic.Up += clientTraffic.Up
 			traffic.Down += clientTraffic.Down
@@ -125,7 +123,8 @@ func (s *SubService) GetSubs(subId string, host string) ([]string, int64, xray.C
 			} else {
 				traffic.Total += clientTraffic.Total
 			}
-			if clientTraffic.ExpiryTime != traffic.ExpiryTime {
+			normalized := subscriptionExpiryFromClient(clientTraffic.ExpiryTime)
+			if normalized != traffic.ExpiryTime {
 				traffic.ExpiryTime = 0
 			}
 		}
@@ -134,6 +133,16 @@ func (s *SubService) GetSubs(subId string, host string) ([]string, int64, xray.C
 	return result, lastOnline, traffic, nil
 }
 
+func subscriptionExpiryFromClient(expiryTime int64) int64 {
+	if expiryTime > 0 {
+		return expiryTime
+	}
+	if expiryTime < 0 {
+		return time.Now().UnixMilli() + (-expiryTime)
+	}
+	return 0
+}
+
 func (s *SubService) getInboundsBySubId(subId string) ([]*model.Inbound, error) {
 	db := database.GetDB()
 	var inbounds []*model.Inbound

sub/subService_test.go

@@ -5,10 +5,27 @@ import (
 	"encoding/json"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/mhsanaei/3x-ui/v3/database/model"
 )
 
+func TestSubscriptionExpiryFromClient(t *testing.T) {
+	if got := subscriptionExpiryFromClient(0); got != 0 {
+		t.Fatalf("zero expiry should stay zero, got %d", got)
+	}
+	if got := subscriptionExpiryFromClient(1_700_000_000_000); got != 1_700_000_000_000 {
+		t.Fatalf("positive expiry should pass through, got %d", got)
+	}
+	const oneDayMs = int64(86_400_000)
+	before := time.Now().UnixMilli()
+	got := subscriptionExpiryFromClient(-oneDayMs)
+	after := time.Now().UnixMilli()
+	if got < before+oneDayMs || got > after+oneDayMs {
+		t.Fatalf("delayed-start expiry should land ~1 day from now, got %d (window %d..%d)", got, before+oneDayMs, after+oneDayMs)
+	}
+}
+
 func TestFindClientIndex(t *testing.T) {
 	clients := []model.Client{
 		{Email: "a@example.com"},