The problem with this approach is that the friendship pair will not be able to register progress for that day, so this is not a solution I would recommend.
According to a thread in SliphRoad reddit, it is better to either battle together or raid together. Before doing that, remember not to open up gifts for that day. Open up gifts after the battle or raid.
The Asia-Pacific region: 12:00 p.m. to 3:00 p.m. JST (GMT +9)
Europe, the Middle East, Africa, and India: 9:00 a.m.to 12:00 p.m. UTC (GMT +0)
The Americas and Greenland: 11:00 a.m. to 2:00 p.m. PT (GMT -8)
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