Does the time difference between Manila and Nairobi change during the year?

No. The gap stays at 5h all year.

When is the best time to call Nairobi from Manila?

Between 14:00 and 17:00 in Manila, which is 09:00 to 12:00 in Nairobi.

Manila is 5h ahead of Nairobi. This gap is the same all year — neither city shifts its clocks relative to the other.

Manila

Philippines

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Nairobi

Kenya

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A 9-to-5 day in each city overlaps for 3h. That is 14:00–17:00 in Manila, which is 09:00–12:00 in Nairobi.

City	Time zone	UTC offset
Manila · Philippines	Asia/Manila	UTC+8
Nairobi · Kenya	Africa/Nairobi	UTC+3

What is the time difference between Manila and Nairobi?: Manila is 5h ahead of Nairobi. This gap is the same all year — neither city shifts its clocks relative to the other.
Does the time difference between Manila and Nairobi change during the year?: No. The gap stays at 5h all year.
When is the best time to call Nairobi from Manila?: Between 14:00 and 17:00 in Manila, which is 09:00 to 12:00 in Nairobi.