〜てからというもの

Pattern
〜てからというもの
Level
N3
Meaning
Ever since (something happened, a permanent change has occurred).
Attaches to
Verb (te-form)
Nuance & register

Literary or formal emphasis on the change.

Example

日本に来てからというもの、毎日がとても楽しい。 Ever since I came to Japan, every day has been very fun.

Easily confused with

〜て以来. Similar, but 〜てからというもの emphasizes the lasting influence/change caused by that event.

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