All tools · 📐 Format / Inspect
⏰ Cron Expression Builder
Cron expressions are powerful but cryptic. Build one visually field by field, get an English explanation, and preview the next 5 execution times. Supports standard 5-field cron.
Examples
*/5 * * * *Every 5 minutes0 9 * * 1-5At 09:00 Monday through Friday0 0 1 * *At 00:00 on day 1 of the monthFrequently asked questions
What are the 5 fields?
minute (0-59), hour (0-23), day of month (1-31), month (1-12), day of week (0-6, 0=Sun). Older systems sometimes add a 6th field for seconds.
What does the slash mean?
"step" — */5 means every 5 (starting from 0). 10-30/5 means every 5 within the 10-30 range.
Linux cron vs systemd timers?
Cron is older and universal. systemd timers are more flexible (calendar expressions, dependencies) but Linux-only. For portability, prefer cron.
Why is my cron job not running?
Common: PATH not set in cron context, working directory wrong, output going to /dev/null silently. Add MAILTO at top of crontab or redirect stderr to a logfile.
About this tool
Cron Expression Builder runs entirely in your browser using standard Web APIs. No data is sent to any server. The source for this tool is in our public GitHub repository.
Related tools
- 📅 Working Days Calculator — Count business days between two dates, excluding weekends and optional holidays.
- 🔄 Timestamp Converter — Convert between Unix timestamp, ISO 8601, and human-readable date formats.
- 🌐 Time Zone Converter — Convert any time to major world time zones (US, EU, Asia).
Why this tool
vs typical free web-tool sites
| 1vw | Typical free site | |
|---|---|---|
| Price | Free | Free |
| Signup required | No | Often (for premium features) |
| Ads inside the tool | No | Yes (banner + video) |
| Data sent to server | No (browser-only) | Yes (inputs analyzed for ads) |
| Total tools | 96 | Often <20 or scattered across sites |
| Bookmarkable URL per tool | Yes | Mixed |
| Loads in under 1s | Yes (static) | Often slow (ad tracking) |
| Multilingual | EN / ES / PT / FR / DE | Usually EN only |
| Open source | Yes | No |