Currently, start dates are not supported within Trello natively. There are some 3rd party Power-Ups available, that can help to add another date for a card (such as a start date) if you like, however if you are using these Power-Ups we'd recommend reaching out to their support team for more information on the capabilities.
You might also consider using custom fields to add an additional date to a Trello Card: https://help.trello.com/article/1067-using-the-custom-fields-power-up
If you had to thrive a new habit during a lockdown, what would it be? Trello
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