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time flies
time flies (when you're having fun)
Fig. time passes very quickly. (From the Latin tempus fugit.) I didn't really think it was so late when the party ended. Doesn't time fly? Time simply flew while the old friends exchanged news.
time flies
(spoken) a certain period has passed surprisingly quickly I can't believe your daughter is old enough to be in college already! How time flies!
Etymology: based on the saying time flies when you are having fun
Time flies.
also How time flies! something that you say which means that time passes very quickly, often so quickly that you are surprised I can't believe your son is at university already. How time flies! I never seem to manage to finish my work. The time just flies.
time flies
Time passes quickly, as in It's midnight already? Time flies when you're having fun, or I guess it's ten years since I last saw you-how time flies. This idiom was first recorded about 1800 but Shakespeare used a similar phrase, "the swiftest hours, as they flew," as did Alexander Pope, "swift fly the years."