Halo Wars 2

Daily Challenges are reset at 8pm PST, 11pm EST, or 7am GMT (depending on your time zone). Along with Weekly Challenges, they can be accessed via the Main Menu by opening the "Challenges" tab.

Generally, Daily Challenges are much simpler compared to their Weekly counterpart; they usually consist of winning one match-made game of Deathmatch or Domination, or finishing two match-made games as a specific leader (Cutter, Anders, Shipmaster, etc.). Upon completing a Daily Challenge, re-opening the "Challenges" tab will show that specific one crossed off and replaced by a countdown timer as to when the next Challenge will become available.

Again, these Challenges are fairly easy and shouldn't take longer than an hour to complete considering they only ask to complete matches under certain constraints, not win them.