Q:

How to get Start Date of current iteration of Azure DevOps?

I would like to do a query on Azure Devops considering the condition:
work item = Task and
created date < ["Start date of @CurrentIteration"] and 
iteration path = @CurrentIteration
How can I perform this contintion (["Start date of @CurrentIteration"]) on Azure Devops?

A:

How can I perform this contintion (["Start date of
  @CurrentIteration"]) on Azure Devops?

As I know there's no predefined macros that represents the start date of @CurrentIteration. We have to go Sprints tab manually to get the start date of current Iteration and then use that value in Query.
You can check this document for more details: To list work items based on when they were created, closed, resolved, or changed state—use @Today or specify dates. For queries that list work items based on their assignment to a team's current sprint, use @CurrentIteration.
For now we don't have such macros like @StartOfCurrentIteration. But it would be better if we have one macros used to represent the start date of @CurrentIteration. So I suggest you can post one feature request(Suggest a feature) of this macros in our User Voice forum-Developer Community Forum. 

Thank you for helping us build a better Azure DevOps. Hope my answer makes some help:)

