Developer utility for explaining numeric five-field cron schedules and calculating upcoming runs after an explicit reference timestamp in an IANA timezone. See the matched values for each field, local times, UTC offsets, UTC instants, and a downloadable JSON report. Edit the schedule or try quarter-hour and weekday presets. Supports numeric wildcards, lists, ascending ranges, and steps. Sunday is 0 or 7. Day-of-month and day-of-week use Vixie cron semantics: if either field begins with *, both must match; otherwise either may match. This includes star-prefixed step expressions. The simulation skips nonexistent local times and returns both instances of repeated local times, making daylight-saving transitions visible. Scheduler dialects and runtime policies may differ. Limits: five numeric fields only, reference years 1970–2095, at most 20 occurrences, search horizon of 1,830 days. Partial results do not mean a schedule can never run. No month or weekday names, macros, seconds, years, ?, L, W, #, commands, job installation, execution, or monitoring.
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