Like other live service gacha games, Wuthering Waves relies on daily missions and rewards to keep players coming back, so knowing when to reset is essential for getting in, grabbing the freebies, and getting out before the addiction bug takes hold.
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When the game resets daily, new quests and unlockables become available, incentivizing players to come back for multiple days and keep playing the game for new content. Not everyone can play every hour of the day, so knowing when to jump in and what to get is crucial to maximizing your enjoyment.
The daily reset time in Wuthering Waves occurs when the regional server time reaches 04:00. For example, Europe's clock is set to the GMT timezone, so at 04:00 GMT the daily missions will be unlocked each day.
You can check how long you have between dailies by going to your Guidebook from the main menu and clicking Activity at the top. There will be a countdown for how long it takes for those sets of missions to reset, the same time that is used for everything else.