Back End Development and APIs Projects - Timestamp Microservice

Tell us what’s happening:
I have no issues with this challenge so far. But have a question. One of the requirements is:
A request to /api/:date?with a valid date should return a JSON object with aunix key that is a Unix timestamp of the input date in milliseconds (as type Number)
Somehow I miss it but what means “?” mark after date? It hard to google it so I decided to ask here. Hopefully I did right. Thank you

Your code so far
N/A

Challenge: Back End Development and APIs Projects - Timestamp Microservice

Link to the challenge:

Found it. Its a part of regular expression. Thank you

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