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

No. Both cities keep the same local time all year.

When is the best time to call Manila from Beijing?

Between 09:00 and 17:00 in Beijing, which is 09:00 to 17:00 in Manila.

Beijing and Manila are on the same local time. This gap is the same all year — neither city shifts its clocks relative to the other.

Beijing

China

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Manila

Philippines

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A 9-to-5 day in each city overlaps for 8h. That is 09:00–17:00 in Beijing, which is 09:00–17:00 in Manila.

City	Time zone	UTC offset
Beijing · China	Asia/Shanghai	UTC+8
Manila · Philippines	Asia/Manila	UTC+8

What is the time difference between Beijing and Manila?: Beijing and Manila are on the same local time. This gap is the same all year — neither city shifts its clocks relative to the other.
Does the time difference between Beijing and Manila change during the year?: No. Both cities keep the same local time all year.
When is the best time to call Manila from Beijing?: Between 09:00 and 17:00 in Beijing, which is 09:00 to 17:00 in Manila.