[Feature request] Add ability to use "Time From Now" instead of just fixed time

[Afasso]

Currently the only way to add operations is using the "Day, Hour, Min" format. Fixed date. Ie: May 12th, 14:00 eve time

The problem is, structures in eve don't give you the time their timer is going to finish in that format. If you are on grid with an enemy structure it will say something like: "2d, 3h, 39m remaining"

This means FC's then need to use a third party site https://www.timeanddate.com/date/timeadd.html for example, to calculate what this actually is in a fixed date format, and if they are not in UTC themselves, also need to make sure to fill in the correct date and time for eve as well. This site also then gives the result in an AM/PM format for US clients, Leading to a fairly long, clunky, and mistake-prone process.

If the calendar could have an option to add a timer using the "time from now" format, that would be awesome <3
Similar to allianceauth's "Structure Timers" feature

Or at least, a calculator tool that would pop up next to the "Create operation" window that would take a "2d, 13h, 10m" format input, and add that duration to the current UTC time, so that the FC can easily then enter the result into the calendar.

Is this doable?

[olanguedoc]

This is a great idea