Guadeloupe and Martinique are located in the lower antilles, they are french caribbean islands. They are located in the UTC-4[GMC/UTC] time zone. 

The time you read this is: 

It is therefore the same time in Guadeloupe and Martinique

From Europe

If you are in France while you are lunching at noon the french caribbean will barely be awake. Be mindful of this when you want to make phone calls you may wake someone. 

From Quebec 

Flights to Guadeloupe and Martinique