As in parts of the world have different time zones, you can send a message to that person via social media in which the time stamp says 21:30 at night from your perspective, but when they receive it their clock says 04:30 in the morning -17h in the past despite hanging out via discord chat. They haven’t responded yet until 09:00 (CDT) on Fri which is 02:00 (JST) on Sat, by then you are already ZZZ so the conversation already ended before it started.