No date during the year other than fiscal year end has any particular significance unless you are not bringing forward any historical data.  Just start using it, enter any missing data and you should be good to go.

Resolution for 'Conversion date issue: 'can i start quickbooks online at 1st of month? Conversion date 8-1-16?' available: Yes.

The Conversion date issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the Conversion date issue yourself by looking for a resolution described in the article. If it is a complex Conversion date issue or you are unable to solve the issue, you may contact us by clicking here or by using other Conversion date support options.

For more information about resolving issues related to Conversion date in Quickbooks/QBO or to get support for the issue 'can i start quickbooks online at 1st of month? Conversion date 8-1-16?', click the link below: