分期扣款(每月1号执行),分期数据时间，1号和20号的问题

AppStart/Helper/InstallmentDeductionService.cs

@@ -9,7 +9,7 @@ using Library;
 namespace MySystem
 {
     /// <summary>
-    /// 分期扣款(每月20号执行)
+    /// 分期扣款(每月1号执行)
     /// </summary>
     public class InstallmentDeductionService
     {
@@ -37,8 +37,8 @@ namespace MySystem
                         {
                             function.WritePage("/InstallmentDeduction/", "check" + DateTime.Now.ToString("yyyy-MM-20") + ".txt", DateTime.Now.ToString("HH:mm:ss"));
                             WebCMSEntities db = new WebCMSEntities();
-                            var startdate = DateTime.Parse(DateTime.Now.ToString("yyyy-MM-20 00:00:00"));
-                            var enddate = startdate.AddDays(1);
+                            var startdate = DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01 00:00:00"));
+                            var enddate = startdate.AddMonths(1);
                             // var info = db.ToChargeBackRecordSub.Where(m => m.Status == 0 && m.StartDate >= startdate && m.StartDate < enddate).ToList();//分期扣款记录明细
                             var info = db.ToChargeByStage.Where(m => m.Status == 0).ToList();//分期扣款记录
                             foreach (var item in info)