To know when your subscription renews, remember that it happens exactly on the same day and time each month as when you first subscribed.
For those on a yearly plan, your plan hours refresh monthly on the same day. For instance, if you subscribed to a yearly plan on August 8, your plan hours will refresh on the 8th of each month.
To easily find your renewal date, you can either use the info command in Discord or visit your Manage Subscription page on midjourney.com.
Your renewal time may vary up to an hour from what's shown in Discord due to Daylight Saving Time/Summer Time.
Remember, all Midjourney subscription plans automatically renew unless you set your plan to cancel.