MySQL - Truncated incorrect datetime value on update statement

I have an application which produces log files. These log files include a Timestamp field in the format 2015-08-25T09:35:01 UTC. (there will be approximately 60 logs produced at 0.25 GB per day). I need to import these log files into MySQL for analysis. But I have a problem converting the Timestamp to DateTime. example: CREATE TABLE test1 ( TIMESTAMP varchar(25) DEFAULT NULL, EVENT_TIME datetime DEFAULT NULL ); INSERT INTO test1 (TIMESTAMP) VALUES ('2015-08-25T09:35:01 UTC'), ('2015-08-25T09:36:01 UTC'), ('2015-08-25T09:37:01 UTC'), ('2015-08-25T09:38:01 UTC'), ('2015-08-25T09:39:01 UTC'); So far so good. I can now run a SELECT query to get the datetime SELECT CAST(TIMESTAMP AS datetime) FROM test1; But, if I try to update the table with the datetime format I get an error UPDATE test1 SET EVENT_TIME = CAST(TIMESTAMP AS datetime); Error Code: 1292. Truncated incorrect datetime value: '2015-08-25T09:35:01 UTC' Is there a way to do this? as I really need the datetime field in the database, so I don't have to do the CAST every time I run a query. I was also looking to partition the table by date, as there will be a lot of data produced, and so I only want to keep the minimum amount of data, and then drop the oldest partitions once I am done.