expression, godan verb (-tsu)
time passes; the days and months go by
A set phrase expressing the passage of time, often with a sense of nostalgia or reflection. Used in both spoken and written Japanese.
月日が経つのは早いものだ。
How quickly the days and months go by.
あれからずいぶん月日が経った。
A lot of time has passed since then.
Standard kanji spelling for this set phrase.
Kana spelling of the verb part; common in everyday writing.
A set phrase combining 月日 (months and days) with 経つ (to pass). The expression is straightforward and its meaning is transparent from its components.