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Discover LudwigThe phrase "by which day" is correct and usable in written English
It can be used when asking for a specific deadline or date by which something should be completed. Example: "Please let me know by which day you need the report submitted."
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According to research by Which?, Tuesday is the cheapest day of the week to fly from the UK.
Another legal hurdle for Rodriguez: As a member of the Major League Baseball Players Assn., he agreed to the process by which Saturday's decision was rendered.
Many (especially corporate) laboratories have a formal process by which each day's lab notebook pages are signed and witnessed.
The late afternoon point by which only Jason Day could defeat himself was the most dangerous.
Future studies should address physiologic mechanisms by which upper trunk SAT is metabolically deleterious and leg SAT is protective.
South Bay-ers and valley girls should head to their nearest Lazy Dog location for the epicenter of dude-ness, by which we mean Monday Night Football.
The "mail" dates refer to the day by which an application must be postmarked.
Back in the day (by which I mean from 1733-1867), Alaska was a Russian colonial possession.
To investigate differences between healers these analyses were supplemented by ANOVAs, which included day (=healer) and interactions with day as systematic effects.
The bidding runs until Wednesday, by which time his teammates may stop ribbing him.
Chelsea next play at Leicester on Monday, by which time they could be in the Premier League's relegation zone.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com