diff --git a/db/update3.1.sql b/db/update3.1.sql
index df66629878..0c1f6a8371 100644
--- a/db/update3.1.sql
+++ b/db/update3.1.sql
@@ -1,2 +1,2 @@
-ALTER TABLE  `zt_task` ADD  `estimateStartDate` DATETIME NOT NULL AFTER  `assignedDate` ,
-ADD  `actualStartDate` DATETIME NOT NULL AFTER  `estimateStartDate`;
+ALTER TABLE  `zt_task` ADD  `estStarted` DATE NOT NULL AFTER  `assignedDate` ,
+ADD  `realStarted` DATE NOT NULL AFTER  `estStarted`;