add date format

img.go

@@ -28,6 +28,7 @@ import (
 	"log"
 	"path"
 	"strconv"
+	"time"
 
 	"golang.org/x/text/language"
 	"golang.org/x/text/message"
@@ -114,8 +115,9 @@ func GenImg(width int, outputPath, payload, tmpl, workingDir string) string {
 }
 
 var funcMap = template.FuncMap{
-	"formatNumber": FormatNumber,
-	"div":          Div,
+	"formatNumber":      FormatNumber,
+	"div":               Div,
+	"formatDateFromSec": formatDateFromSec,
 }
 
 func renderTemplate(tmp string, data map[string]interface{}) (string, error) {
@@ -518,3 +520,32 @@ func convertToFloat64(v any) float64 {
 		return 0
 	}
 }
+
+func formatDateFromSec(input any, layout string) string {
+	var sec int64
+	switch v := input.(type) {
+	case int64:
+		sec = v
+	case int:
+		sec = int64(v)
+	case float64:
+		sec = int64(v)
+	case float32:
+		sec = int64(v)
+	case string:
+		parsed, err := strconv.ParseInt(v, 10, 64)
+		if err != nil {
+			if parsedFloat, errFloat := strconv.ParseFloat(v, 64); errFloat == nil {
+				sec = int64(parsedFloat)
+			} else {
+				return fmt.Sprintf("[Error: invalid time string %q]", v)
+			}
+		} else {
+			sec = parsed
+		}
+	default:
+		return "[Error: unsupported time type]"
+	}
+	t := time.UnixMilli(sec * 1000)
+	return t.Format(layout)
+}