Cron Expression Parser — Schedule Explanation

Unix crontab and many schedulers use minute granularity five fields. Sixth second field systems like Spring or Quartz differ — this parser targets classic five-field pattern shown in helper text.

Asterisk any value, comma list, hyphen range, slash step — parser description translates these into human phrases like every six hours.

Upcoming times help verify midnight UTC jobs do not accidentally fire during business hours local time. Cross-check timezone of target scheduler separately — parser uses local browser time unless documented otherwise in library.

Day-of-month and day-of-week both specified create AND semantics in some engines OR semantics in others — verify target platform docs when both non-star.

Paste cron into runbooks with generated English description so on-call engineers understand schedule without decoding stars mentally.

Internal job names in comments not supported — expression only — but no server leak of schedule patterns.

Typo in minute field causing every minute instead of every hour caught when next runs list hundreds of immediate timestamps.

Does not execute jobs or edit crontab files. No timezone conversion UI — know whether production cron runs UTC or local.

Convert next run ISO strings to Unix timestamps for correlation with log entries.

Students experiment with slash step syntax seeing description change immediately — builds intuition faster than man crontab alone.