hesternal

Hes·ter·nal , a.

[L. hesternus; akin to heri yesterday.]
Pertaining to yesterday. [Obs.] See Yester, a. Ld. Lytton.

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(he-STER-nuhl)

adjective
Of yesterday.

Etymology
From Latin hesternus (of yesterday)

There's an equivalent term for "today": hodiernal.

Usage
"I passed up a side-street, one of those deserted ways ... dim places, fusty with hesternal excitements and the thrills of yesteryear." — Rupert Brooke; Letters From America; Sidgwick & Jackson; 1971.

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[fr. hesternus, of yesterday]  pertaining to yesterday