Be sure to use the "Timestamp in milliseconds" value in the curl command.
It is recommended that a recent date is used when generating a timestamp and running the command. For example, a date from a couple of days ago to a week ago. This helps to ensure that a large amount of data is not downloaded during the test. The main purpose of the curl command is to test to ensure the log export is working through the API and logs from a recent date should be sufficient to test this.
If the command is successful, a log file should be generated within the directory from where the command is being run. This indicates that the API is available and working as expected using the provided API credentials.