支付返券页面滑动&&优惠券复用

@@ -244,18 +244,20 @@ class _CouponEidtPageState extends State<CouponEidtPage> {
             widget.couponSunModel!.expirationDate!.validForever == '1'
                 ? true
                 : false;
-        DateTime dateTimes = DateTime.fromMillisecondsSinceEpoch(
-            int.parse(widget.couponSunModel!.expirationDate!.stime.toString()) *
-                1000);
-        DateTime dateTimee = DateTime.fromMillisecondsSinceEpoch(
-            int.parse(widget.couponSunModel!.expirationDate!.etime.toString()) *
-                1000);
-        fromDate = '${dateTimes.year}' +
-            '-${Utils.addZeroNumber(dateTimes.month)}' +
-            '-${Utils.addZeroNumber(dateTimes.day)}'; //活动有效期开始时间
-        endDate = '${dateTimee.year}' +
-            '-${Utils.addZeroNumber(dateTimee.month)}' +
-            '-${Utils.addZeroNumber(dateTimee.day)}';
+        if (!validForever) {
+          DateTime dateTimes = DateTime.fromMillisecondsSinceEpoch(int.parse(
+                  widget.couponSunModel!.expirationDate!.stime.toString()) *
+              1000);
+          DateTime dateTimee = DateTime.fromMillisecondsSinceEpoch(int.parse(
+                  widget.couponSunModel!.expirationDate!.etime.toString()) *
+              1000);
+          fromDate = '${dateTimes.year}' +
+              '-${Utils.addZeroNumber(dateTimes.month)}' +
+              '-${Utils.addZeroNumber(dateTimes.day)}'; //活动有效期开始时间
+          endDate = '${dateTimee.year}' +
+              '-${Utils.addZeroNumber(dateTimee.month)}' +
+              '-${Utils.addZeroNumber(dateTimee.day)}';
+        }
       }
       if (widget.couponSunModel!.aexpiration != null) {
         validForeverCus =