Reminders are automatically adjusted to the time zone specified in the current user profile:
When creating a reminder for 7 PM, the app will assume that it is 7 PM in the user's time zone.
When browsing the list of reminders, the user will see the reminder dispatch time according to their current time zone.
Given the importance of understanding the reminder dispatch time within the context of the user's time zone, the app displays this information prominently. Simply click on the provided link to navigate to your time zone settings.
Case 1. Anna lives in New York (UTC -4 in her profile) and creates a reminder for Peter to 9 AM. Peter lives in London (UTC is in his profile) so Anna's 9 AM is Peter’s 1 PM. They will see the same reminder dispatch time differently.
Case 2. Anna creates a reminder to herself to 9 AM. She goes on a business trip and her new time zone is -1h to the NY time. She changes the time zone in her profile – then she will see her reminder planned for 8 AM.
Note that changing your timezone will not affect other users or the existing reminders dispatch time, it will only affect how the date-time information is being displayed for you in the Jira interface.