enhance(charge):完成用户服务延期功能的测试。

utils/time.go

@@ -0,0 +1,11 @@
+package utils
+
+import "time"
+
+func VeryBeginOfDate(date time.Time) time.Time {
+	return time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
+}
+
+func VeryEndOfDate(date time.Time) time.Time {
+	return time.Date(date.Year(), date.Month(), date.Day(), 23, 59, 59, 999999999, date.Location())
+}