Challenge

The endpoint gates the flag behind the request date.

Solution

Intercept the POST and set the date to the value the server wants:

Wed Jun 07 2023 06:09:42 GMT+∀ (BCA Special Time)

Send it and the flag comes back.

Flag

bcactf{y0U_m@d3_hT7p_H!$70rY?!_HDU38rndu8}