[1] Discord Developer Portal — Documentation — Reference, 2023-05-31T22:18:22.000Z, 2023-06-01T06:28:39.619Z https://discord.com/developers/docs/reference#message-formatting

Discord utilizes a subset of markdown for rendering message content on its clients, while also adding some custom functionality to enable things like mentioning users and channels. This functionality uses the following formats:

[2] Unix time, 日時形式パターン