Date and Time
~~~~~~~~~~~~~

We format date and time conforming to ISO-8601, that is: YYYY-MM-DD and
HH:MM:SS (24h clock).

For more information about that, see: https://xkcd.com/1179/

Unless otherwise noted, we display local date and time.
Internally, we store and process date and time as UTC.


.. rubric:: TIMESPAN

Some options accept a TIMESPAN parameter, which can be given as a
number of days (e.g. ``7d``) or months (e.g. ``12m``).