这个错误大家碰到过么? django连接mysql

InvalidOperation at /admin/
Invalid literal for Decimal: '2011-03-05 13:20:56'
Request Method: POST
Request URL: http://localhost:8000/admin/
Django Version: 1.2.4
Exception Type: InvalidOperation
Exception Value:
Invalid literal for Decimal: '2011-03-05 13:20:56'
Exception Location: C:\Python26\Lib\site-packages\MySQLdb\connections.py in defaulterrorhandler, line 35
Python Executable: C:\Python26\python.exe
Python Version: 2.6.0
Python Path: ['D:\\Projects\\microstream\\msweb', 'C:\\Python26\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\lib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
Server time: Sat, 19 Feb 2011 13:21:00 +0800

从错误看是把日期当数字存了。没有具体的信息（model是什么样的，出错的时候在做什么操作）不太清楚。