There is no time difference between Brasilia, Brazil and Cayenne, French Guiana currently.
Neither Brasilia nor Cayenne observe daylight saving time.
Brasilia and Cayenne time difference remains the same throughout the year.
See distance from Brasilia to Cayenne
3:52 pm Monday, in Brasilia, Distrito Federal, Brazil is 3:52 pm Monday, in Cayenne, French Guiana