Strong’s Greek
G5504 — chthes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἐχθές
chthes — pronounced khthes
of uncertain derivation; "yesterday"; by extension, in time past or hitherto:--yesterday.
2 occurrences in the KJV.
Acts 7:28
Wilt thou kill me, as thou diddest the Egyptian yesterday?
Hebrews 13:8
Jesus Christ the same yesterday, and to day, and for ever.