Today I spent multiple hours trying to debug a timezone issue in a codebase. The timezone I was testing with was Etc/GMT+4, which I had assumed was four hours ahead of GMT. Turns out, it’s actually 4 hours behind GMT 🤦‍♂️

Worth noting is that what counts as an “active user” has changed between now and then. During the Reddit API exodus, an “active user” was a user who had posted or commented in the past month. Now, it includes users who have voted. If the 54k MAU record was set using the first algorithm, it is likely that the MAU using the new algorithm (which includes voting) would have been much higher.