yesterday, previous
昨 centers on time that has just passed: yesterday or the immediate previous period. The idea of "previous" is a natural extension of the day before today.
昨 combines 日 (day) with 乍, which likely contributes the sound and the idea of something recent or just past. The exact historical role of 乍 is uncertain, but the compound expresses a day that has just gone by.
The sun 日 on the left and the shape 乍 on the right look like a sun setting behind a fence. Picture yesterday's sun disappearing behind that fence, marking the previous day.
For サク, imagine a sack of memories from yesterday: sack -> サク, and you open the sack to recall the previous day.
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yesterday
last year
last night; yesterday evening
last night; yesterday evening
these days; nowadays; recently; lately
day before yesterday
last night
year before last
last (year); yesterday
yesterday and today
previous year (fiscal, academic, etc.)
last season (e.g. in sports); equivalent season last year
last summer; summer of last year
autumn of last year; fall of last year
one previous
two nights before last
two years before last (year); three years back (ago)
night before last
three (days, years, etc.) ago; two ... before last
two days before yesterday; three days back (ago)