Roll20 uses dates and times in various places, but they all are in the US format, meaning e.g. month-day-year hour:minutes AM/PM, which is a chore to understand for anybody from outside. Add an option to use some standard and European date and time formats, or totally custom ones. Examples: - ISO-8601/RFC-3339 date: YYYY-MM-DD e.g. 2015-08-20 - RFC-2822 date: shortweekday, DD shortmonth YYYY, e.g. Thu, 20 Aug 2015 (can be without weekday) - 24h time: e.g. 14:00 - time zone abbreviations: CET instead of UTC+1 (list: <a href="https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations" rel="nofollow">https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations</a> )