The only way to forget time is to make use of it.

[On ne peut oublier le temps qu’en s’en servant.]

Charles Baudelaire (1821-1867) French poet, essayist, art critic

Journaux Intimes [Intimate Journals], “Mon cœur mis à nu [My Heart Laid Bare],” § 111 (1864–1867; pub. 1887) [tr. Sieburth (2022)]
    (Source)

(Source (French)). Alternate translations:

One can only forget Time by making use of it.
[tr. Isherwood (1930)]

One can only forget about time by making use of it.
[Common, e.g.]