Japanese by Example
Learning through examples in manga

Decision made during the day yesterday with 〜うちに

Manga panel from 恋に恋するユカリちゃん showing example of Decision made during the day yesterday with 〜うちに.
恋に恋するユカリちゃん » Volume 5 » Page 4

Yukari and her friends have a miscommunication on whether they’ll change from their summer uniforms to their winter uniforms yet. The decision is finalized just in time, as the following day is even colder.

ユカリ:
昨日(きょう)うちに衣替(ころもが)えしておいて()かった。」
“I'm glad we (took the opportunity and) settled our uniform change (during) yesterday.”