Cron Builder

Compose 5-field cron schedules (minute/hour/day/month/weekday) and immediately preview upcoming executions.

Preset

Minute Hour

Day of month Month

Day of week

Generated cron expression

Summary

Next runs (Local/UTC)

Reference time (local)

Status

Runs in your browser. No input is sent to a server.

How to use

Apply a preset or fill five fields manually, then click Generate. Verify upcoming runs before production rollout.

Input a cron 5-field expression (minute/hour/day/month/weekday) or start from presets, then validate and preview next run times.

Useful for avoiding schedule syntax mistakes and checking run timing during operations handoff.

This tool targets common 5-field cron. It is not directly compatible with Quartz-style expressions that include seconds.
When both day-of-month and day-of-week are restricted, matching follows common cron OR semantics.
Final execution timing depends on server timezone and DST settings.

How are weekday `0` and `7` handled?

Both are treated as Sunday, aligned with common cron behavior.

Why do next runs differ from my expectation?

Main factors are day/day-of-week OR semantics, server timezone, and DST transitions.

These links are generated from site_map rules in recommended diagnostic order.

Unix Time Converter — Convert Unix seconds/milliseconds and date-time both ways
Mahjong Point Calculator — Calculate point movement on win from han/fu, honba, and kyotaku
Mahjong All-Last Calculator — Compute ron/tsumo conditions needed to reach target rank from current scores
Text Counter — Count characters including newline and full/half-width views
Regex Tester — Test regex matching, extraction, and replacement
Regex Cheat Generator — Generate regex patterns from practical templates
SQL WHERE Builder — Build WHERE clauses and bind params from condition rows
SQL UPSERT Builder — Generate dialect-specific UPSERT SQL and bind values

One-screen calculators for commonly forgotten quick math

Mahjong Point Calculator — Calculate point movement on win from han/fu, honba, and kyotaku
Mahjong All-Last Calculator — Compute ron/tsumo conditions needed to reach target rank from current scores
Unix Time Converter — Convert Unix seconds/milliseconds and date-time both ways
Text Counter — Count characters including newline and full/half-width views
Regex Tester — Test regex matching, extraction, and replacement
Regex Cheat Generator — Generate regex patterns from practical templates
SQL WHERE Builder — Build WHERE clauses and bind params from condition rows
SQL UPSERT Builder — Generate dialect-specific UPSERT SQL and bind values
Random Token Generator — Generate random tokens with selectable byte size and encoding