
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: https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations )