In the Activities tab, you can select multiple Activities and assign them all a new Due Date, which will be the same for all.


However, is it possible to bulk postpone them? 


For instance, let's say you have:

Activity A - Due Date: 03/04/20

Activity B - Due Date: 17/06/20

Activity C - Due Date: 20/12/20

And you bulk postpone them by 1 month, so they become:

Activity A - Due Date: 03/05/20

Activity B - Due Date: 17/07/20

Activity C - Due Date: 20/01/21