The timezone GFT in French Guiana

Only 1 nationwide time zone

UTC	-3
Standard time:	French Guiana Time (GFT)
Daylight saving time:	none

French Guiana has an east-west extension of 2.6 degrees of longitude. Given the country's location in South America, this corresponds to about 290 kilometers. With such a small extent the course of the sun at different positions in the country hardly matters. The position of the sun in the west of the country deviates from that in the east only about 10 minutes. This means the sun rises and sets 10 minutes later in the west than in the east.

No daylight saving time in French Guiana

Due to the sun's orbit around the equator, the days are longer in summer (June to September in the northern hemisphere). Countries that switch to daylight saving time in the summer months align the daylight phase with the human rhythm. Unused bright morning hours are thus shifted into the evening (more information on daylight saving time here).

Due to its proximity to the equator, the impact in French Guiana would not be particularly large. Cayenne is located just 550 km from the equator. A day in midsummer would then not last from 06:18 to 18:44, but from 07:18 to 19:44. The effect would be quite noticeable in the evening, but the sun rising later in the morning falls at a time when many people are already awake. Thus, daylight saving time was never introduced in French Guiana.