The word for today is…
ephemeral (adjective):
1 : lasting a very short time
2 : lasting one day only
Source : Merriam -Webster
Etymology : In its aquatic immature stages, the mayfly (order Ephemeroptera) has all the time in the world—or not quite: among the approximately 2,500 species of mayflies, some have as much as two years, but a year is more common. But in its adult phase, the typical mayfly hatches, takes wing for the first time, mates, and dies within the span of a few short hours. This briefest of heydays makes the insect a potent symbol of life’s ephemeral nature. When ephemeral (from the Greek word ephemeros, meaning “lasting a day”) first appeared in print in English in the late 16th century, it was a scientific term applied to short-term fevers, and later, to organisms (such as insects and flowers) with very short life spans. Soon after that, it acquired an extended sense referring to anything fleeting and short-lived, as in “ephemeral pleasures.”
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