How do I bulk update "Start Date" for Tasks?

Users can update the start date for one or more tasks from the bulk update screen. 

Go to Tasks > Options > Bulk update

Select the filter criteria and choose the relevant tasks

Under the update details region, update the ‘Start date’ of the selected tasks along with the existing fields like owner, contributor and status. 

Note - Updating the start date will update the scheduled and planned start date. Based on the configuration of the task type then the scheduled and planned end date will be calculated accordingly.