From a site TEd sent me, the etymology of "procrastinate" which I did not know before.

Crastin

The day after, especially after a feast-day or holiday. Used in the sixteenth and seventeenth centuries via Old French,from Latin crastinum, tomorrow. Hence the rare verb crastinate, to put off till tomorrow, which never found favor in English. (Joseph Shipley's Dictionary of Early English 1955)

My motto is never put off till tomorrow what you can put off till next week.