I have to take the public transportation from the Miami International Airport to Miramar on a Monday, and I have to transfer from the Miami Metrorail to the Broward County bus. I am wondering if the Broward County Transport (BCT) accepts Miami-Dade Transportation (MDT)'s one-day pass?
No, but the Day Pass for Broward is only $5.
Also, they use different fare cards so they couldn't offer coop service if they wanted to.
In literally my first Google result, regarding Broward County Transit fares and passes, there is a whole section covering transfers to and from other transit systems.
TRANSFERS TO BCT FROM OTHER SOUTH FLORIDA TRANSIT SYSTEMS
When transferring from MDT, Palm Tran and Tri-Rail to BCT regular fixed-route bus service, passenger pays $.50 with a transfer issued by MDT or Palm Tran and proof of fare payment such as Easy Card and receipt issued by Tri-Rail. Tri-Rail passengers boarding BCT at any locations other than at a Tri-Rail station will be required to pay the full fare.
TRANSFERS BETWEEN OTHER SOUTH FLORIDA TRANSIT SYSTEMS AND PREMIUM EXPRESS BUS SERVICE
[...] Transfer from MDT or Tri-Rail to Premium Express Service, a $.50 transfer fee is required with the appropriate transfer from MDT or Tri-Rail.
The Easy Card issued by MDT and Tri-Rail is not accepted as payment on any BCT bus.