diff --git a/scripts/generate_daily_report.go b/scripts/generate_daily_report.go
index fe7659a..6a0e6de 100644
--- a/scripts/generate_daily_report.go
+++ b/scripts/generate_daily_report.go
@@ -85,7 +85,10 @@ func run() error {
 	}
 	defer db.Close()
 
-	date := time.Now().Format("2006-01-02")
+	date, err := resolveReportDate(time.Now(), os.Args[1:], os.Getenv("REPORT_DATE"))
+	if err != nil {
+		return err
+	}
 
 	// 1. 获取报告数据(使用新schema)
 	report, err := generateReportDataV3(db, date)
@@ -133,6 +136,35 @@ func run() error {
 	return nil
 }
 
+func resolveReportDate(now time.Time, args []string, envDate string) (string, error) {
+	date := strings.TrimSpace(envDate)
+
+	for i := 0; i < len(args); i++ {
+		switch {
+		case args[i] == "-date" || args[i] == "--date":
+			if i+1 >= len(args) {
+				return "", fmt.Errorf("缺少 -date 参数值，期望格式 YYYY-MM-DD")
+			}
+			date = strings.TrimSpace(args[i+1])
+			i++
+		case strings.HasPrefix(args[i], "-date="):
+			date = strings.TrimSpace(strings.TrimPrefix(args[i], "-date="))
+		case strings.HasPrefix(args[i], "--date="):
+			date = strings.TrimSpace(strings.TrimPrefix(args[i], "--date="))
+		}
+	}
+
+	if date == "" {
+		return now.Format("2006-01-02"), nil
+	}
+
+	parsed, err := time.Parse("2006-01-02", date)
+	if err != nil {
+		return "", fmt.Errorf("无效报告日期 %q，期望格式 YYYY-MM-DD", date)
+	}
+	return parsed.Format("2006-01-02"), nil
+}
+
 // ============ 数据模型 ============
 
 const (
diff --git a/scripts/generate_daily_report_test.go b/scripts/generate_daily_report_test.go
index f61fd4c..7154fc6 100644
--- a/scripts/generate_daily_report_test.go
+++ b/scripts/generate_daily_report_test.go
@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+	"time"
 )
 
 func sampleReportForV1() *ReportV3 {
@@ -180,6 +181,52 @@ func TestBuildFreeSourceBreakdown(t *testing.T) {
 	}
 }
 
+func TestResolveReportDateDefaultsToToday(t *testing.T) {
+	got, err := resolveReportDate(time.Date(2026, 5, 14, 9, 0, 0, 0, time.FixedZone("CST", 8*3600)), nil, "")
+	if err != nil {
+		t.Fatalf("resolveReportDate returned error: %v", err)
+	}
+	if got != "2026-05-14" {
+		t.Fatalf("date = %q, want %q", got, "2026-05-14")
+	}
+}
+
+func TestResolveReportDateUsesEnvDate(t *testing.T) {
+	got, err := resolveReportDate(time.Now(), nil, "2026-05-09")
+	if err != nil {
+		t.Fatalf("resolveReportDate returned error: %v", err)
+	}
+	if got != "2026-05-09" {
+		t.Fatalf("date = %q, want %q", got, "2026-05-09")
+	}
+}
+
+func TestResolveReportDateCLIOverridesEnv(t *testing.T) {
+	got, err := resolveReportDate(time.Now(), []string{"-date", "2024-06-05"}, "2026-05-09")
+	if err != nil {
+		t.Fatalf("resolveReportDate returned error: %v", err)
+	}
+	if got != "2024-06-05" {
+		t.Fatalf("date = %q, want %q", got, "2024-06-05")
+	}
+}
+
+func TestResolveReportDateSupportsEqualsSyntax(t *testing.T) {
+	got, err := resolveReportDate(time.Now(), []string{"--date=2024-10-25"}, "")
+	if err != nil {
+		t.Fatalf("resolveReportDate returned error: %v", err)
+	}
+	if got != "2024-10-25" {
+		t.Fatalf("date = %q, want %q", got, "2024-10-25")
+	}
+}
+
+func TestResolveReportDateRejectsInvalidDate(t *testing.T) {
+	if _, err := resolveReportDate(time.Now(), []string{"-date", "2026/05/09"}, ""); err == nil {
+		t.Fatalf("expected invalid date error")
+	}
+}
+
 func TestDecorateReportV1BuildsHotDaySummary(t *testing.T) {
 	report := sampleReportForV1()
 	report.ModelEvents = []ModelEvent{
diff --git a/scripts/rebuild_historical_report.sh b/scripts/rebuild_historical_report.sh
new file mode 100755
index 0000000..222d370
--- /dev/null
+++ b/scripts/rebuild_historical_report.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT_DIR"
+
+if [[ $# -lt 1 ]]; then
+  echo "用法: scripts/rebuild_historical_report.sh YYYY-MM-DD" >&2
+  exit 1
+fi
+
+REPORT_DATE="$1"
+shift || true
+
+if [[ -f ".env.local" ]]; then
+  # shellcheck disable=SC1091
+  source ".env.local"
+fi
+if [[ -f ".env" ]]; then
+  # shellcheck disable=SC1091
+  source ".env"
+fi
+
+REPORT_DATE="$REPORT_DATE" go run -tags llm_script ./scripts/generate_daily_report.go "$@"