About this app

Each field in its own card with its valid range printed underneath, expanding ranges, lists and step values, and rejecting anything malformed with the reason. Computes the next ten runs by walking forward a minute at a time — slower than a formula and incapable of getting the edge cases wrong — with the gap between each. Warns about the most common cron bug there is: day-of-month and day-of-week are ORed, not ANDed.