At the moment, dates change at sunset, not at midnight. While this may be consistent with lore, it is confusing as heck. The portal calendar doesn't reflect this, and most people don't think that "dates change around sunset", because the standard real-world calendar has dates changing at midnight.
Can we please make this more intuitive so we can more easily use in-game dates for things instead of having to cagily refer to OOC time?