fix(tgbot): render a disabled start-after-first-use client as days (#6500)

A delayed-start expiry is stored as a negative duration, but the card checked
the disabled-client branch before the sign of that duration, so it printed the
epoch position (-2592000000 ms -> 1969-12-02) and labelled it an expire date.
The sign decides first now, which is how BuildClientDraftMessage in this file,
subscriptionExpiryFromClient and adjustTraffics already read the same value; the
Discord card is the one surface still reading it as unlimited, fixed in #6498.

internal/web/service/tgbot/tgbot_client.go

@@ -442,6 +442,11 @@ func (t *Tgbot) clientInfoMsg(
 	diff := traffic.ExpiryTime/1000 - now
 	if traffic.ExpiryTime == 0 {
 		expiryTime = t.I18nBot("tgbot.unlimited")
+	} else if traffic.ExpiryTime < 0 {
+		// A negative expiry counts days from first use, not a date; the disabled
+		// branch below would otherwise render it as a 1969 timestamp.
+		expiryTime = fmt.Sprintf("%d %s", traffic.ExpiryTime/-86400000, t.I18nBot("tgbot.days"))
+		flag = true
 	} else if diff > 172800 || !traffic.Enable {
 		expiryTime = time.Unix((traffic.ExpiryTime / 1000), 0).Format("2006-01-02 15:04:05")
 		if diff > 0 {
@@ -460,9 +465,6 @@ func (t *Tgbot) clientInfoMsg(
 			}
 			expiryTime += fmt.Sprintf(" (%s)", remainingTime)
 		}
-	} else if traffic.ExpiryTime < 0 {
-		expiryTime = fmt.Sprintf("%d %s", traffic.ExpiryTime/-86400000, t.I18nBot("tgbot.days"))
-		flag = true
 	} else {
 		expiryTime = fmt.Sprintf("%d %s", diff/3600, t.I18nBot("tgbot.hours"))
 		flag = true

internal/web/service/tgbot/tgbot_client_expiry_test.go

@@ -0,0 +1,58 @@
+package tgbot
+
+import (
+	"encoding/json"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/database"
+	"github.com/mhsanaei/3x-ui/v3/internal/web/locale"
+	"github.com/mhsanaei/3x-ui/v3/internal/xray"
+
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"golang.org/x/text/language"
+)
+
+// clientInfoLocalizer renders the lines clientInfoMsg prints with the templates
+// the translation files carry; without it I18n returns the bare keys.
+func clientInfoLocalizer(t *testing.T) {
+	t.Helper()
+	bundle := i18n.NewBundle(language.MustParse("en-US"))
+	bundle.RegisterUnmarshalFunc("json", json.Unmarshal)
+	_ = bundle.AddMessages(language.MustParse("en-US"),
+		&i18n.Message{ID: "tgbot.messages.email", Other: "Email: {{ .Email }}\r\n"},
+		&i18n.Message{ID: "tgbot.days", Other: "Days"},
+		&i18n.Message{ID: "tgbot.messages.expireIn", Other: "Expire In: {{ .Time }}\r\n"},
+		&i18n.Message{ID: "tgbot.messages.expire", Other: "Expire Date: {{ .Time }}\r\n"},
+		&i18n.Message{ID: "tgbot.wentWrong", Other: "went wrong"},
+	)
+	orig := locale.LocalizerBot
+	t.Cleanup(func() { locale.LocalizerBot = orig })
+	locale.LocalizerBot = i18n.NewLocalizer(bundle, "en-US")
+}
+
+// Regression test: a start-after-first-use client is stored as a negative duration,
+// and a disabled one rendered it as a 1969 date.
+func TestClientInfoShowsStartAfterFirstUseWhenDisabled(t *testing.T) {
+	if err := database.InitDB(filepath.Join(t.TempDir(), "x-ui.db")); err != nil {
+		t.Fatalf("InitDB: %v", err)
+	}
+	t.Cleanup(func() { _ = database.CloseDB() })
+	clientInfoLocalizer(t)
+
+	traffic := &xray.ClientTraffic{
+		Email:      "[email protected]",
+		Enable:     false,
+		ExpiryTime: -30 * 24 * 60 * 60000,
+	}
+
+	out := (&Tgbot{}).clientInfoMsg(traffic, false, false, false, true, false, false)
+
+	if strings.Contains(out, "1969") {
+		t.Errorf("client info = %q, want the days left, not a 1969 date", out)
+	}
+	if !strings.Contains(out, "Expire In: 30 Days") {
+		t.Errorf("client info = %q, want it to contain %q", out, "Expire In: 30 Days")
+	}
+}