Make sure your character string is of the format yyyyMMdd. I recommend this, since it is the universal ISO format accepted for string-to-date conversions in SQL. This will work regardless of the locale of the server.
@nm09011985
If you want to update current system date and time into database, you can just direct write the System.DateTime.Now.ToString(“DDMMYYY hh:tt:ss”) into the execute query activity within the below parameter:
‘“+System.DateTime.Now.ToString(“DDMMYYY hh:tt:ss”)+”’