I had troubleshooting with times. I completed my activities by 11:40pm, but I lost my streak. :((((
Does duolingo make a 24hours policy or 12am deadline to maintain streaks? I slightly confused/disappointed.
You have to complete a lesson and earn enough XP to reach your target before midnight in the timezone you were in when you registered for Duolingo. If you have changed time zones or you are using daylight saving time then this could be the the reason for loosing your streak.
It is not always midnight. For me, it is at 9 a.m., local time, even though I'd registered here. @sunskrupt, does not Duo tell you how many hours there are left for you to complete today's goal?