I think this syntax is incredibly unintuitive to combine with "ago" as in the example.. what do you mean "5 yesteryears ago" that is bullshit. it means "5 years ago"? THEN FUCKING SAY 5 YEARS AGO. why include the YESTER prefix when doing that. you can't say "5 yesteryears ago" it has to be "yesteryesteryesteryesteryesteryear" to compose yester and this also shows why for longer periods than like two it's inefficient and you should just say "N years ago" but WHY WOULD YOU SAY "YESTERYEARS AGO"

e621 wiki table, here's the relevant stuff formatted better for a screen reader:

Yester syntax and what it does:

yesterweek: Posts from last week
yestermonth: Posts from last month
yesteryear: Posts from last year
5_yesteryears_ago: Posts from 5 years ago
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