Because the behavior of {0} could vary based on the current user's locale settings, replace this call in {1} with a call ...

Because the behavior of {0} could vary based on the current user's locale settings, replace this call in {1} with a call to {2}. If the result of {2} will be based on input from the user, specify {3} as the 'IFormatProvider' parameter. Otherwise, if the result will based on input stored and accessed by software, such as when it is loaded from disk or from a database, specify {4}.