Does Set Due Date... contradict FSRS?

Anki FSRS
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I did a pretty serious search here and on GitHub on the subject of Set Due Date when FSRS is enabled. I couldn’t figure out what the conclusion was - does it not matter/is it forbidden/not recommended, but is it possible to use this option?

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My answer is based on prior discussions[1][2][3], though I’m also not 100% sure.

@L.M.Sherlock said:

It allows user to grade the card and set the next interval in the same time. It’s very important for FSRS to know that the user reviews the card when they use Set due date. Otherwise, FSRS cannot deal with this case correctly in theory.

And @dae said:

[…] FSRS would prefer every rescheduling have a grade associated with it.

In other words: Set Due Date, in theory, should be avoided if you use FSRS. Instead, the Grade Now feature should be used.

If I understand it correctly, then:

  • It is not forbidden, you can use Set Due Date with FSRS.
  • It is not recommended, though. Grade Now is prefered.

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Are you asking about using Set Due Date on a New card, or on a Review card? You can still use it, but different things will happen, depending on which it is.

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I’m asking mainly to know about Review but I’m also interested in knowing about new.
Thank you very much.

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You can use Set Due Date on Review cards – it will simply change the due date. There’s no need to change the current interval (by using !), because FSRS doesn’t use the current interval for anything in future scheduling.

You can also use Set Due Date on New cards, but it isn’t a great idea. The first reason is the same as with SM-2 – it skips the Learn state and converts the card to Review. But with FSRS, because FSRS doesn’t use the current interval, when you study that card next time, FSRS will treat it like a completely fresh card that just graduated to Review. There’s no way to use Set Due Date to jump a card to a longer interval.

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Regarding the review card - do you mean - the next time I review the card - the schedule will continue as if I pressed the “GOOD” button without taking into account the new interval? If so, that’s pretty bad because - either I’m just wasting time on repetition or I’m moving the card too far away and forgetting. Actually, this can only be useful for really extreme cases.

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No, the next time you study that Review card, FSRS will schedule it according to the exact same rules as if you never used Set Due Date – taking into account the grade you give the card, its memory state, and how long it has actually been since you last studied it. The value stored in “current interval” isn’t a part of the formula.

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