First recorded by The Chambers Brothers (1966).
Hit version by The Chambers Brothers (US #11 1968).
From the wiki: “‘Time Has Come Today’ was first recorded by The Chambers Brothers in 1966 and released as a single with no chart impact. The song was re-recorded in 1967 for the album The Time Has Come. This time, ‘Time Has Come Today’ did have a presence in the Top-40 … and also a significant impact in the counterculture of the time. While the single spent five weeks bubbling under the Top-10 at #11 on the Billboard Hot 100 in the fall of 1968, ‘Time Has Come Today’ is now considered to be one of the landmark Rock songs of the psychedelic era.
“Various effects were employed in its recording and production, including the alternate striking of two cow bells producing a ‘tick-tock’ sound, warped throughout most of the song by reverb, echo and changes in tempo. It also quotes several bars from ‘The Little Drummer Boy’ at ~5:40 in the longer album version.”
The Chambers Brothers, “Time Has Come Today” re-recorded single version (1967):
The Chambers Brothers, “Time Has Come Today” full-length album version (1968):