There's a streak feature on 200wordsaday and other sites. It's a great way to strengthen your skills using nothing but the physics of consistency.
It works. It can give you something to smile about, show off and look forward to breaking.
Unless, you aren't on the right schedule.
If you think you have the whole calendar day, you could be wrong. Maybe the programmer didn't want to have to deal with timezones, and the whole site is on a single 24-hour clock.
The problem arrives when you start your streak writing in the mornings -- then, due to travel, you choose to write in the evening on the next day. More than 24 hours could elapse but you think it's only the next calendar day.
Example: You normally write at six in the morning, so you're catching the streak at whatever time the server is. Then, you suddenly miss the six am slot but write that day at seven pm. Now, the time between your writings is 36 hours.
Technically, the distance between two calendar days can be as much as 47 hours and 59 minutes.
So, the streak algorithm might need to be considered. Else, we'll have people writing every calendar day without being able to rack up a streak.
However, if the goal is to write at least once every twenty for hours, then all is fair.