Cron Expression Parser
Check a five- or six-field cron expression and preview its next run times in an IANA time zone. Understand every-five-minute schedules, weekdays and daylight saving time.
Your result will appear here.
How to check a cron expression
- Paste a cron expression, or start with an every-minute, hourly or daily preset.
- Enter the IANA time zone used by your scheduler, such as Australia/Hobart or UTC.
- Inspect the next ten scheduled times and expanded fields. Confirm the syntax against your actual scheduler.
Working with Cron Expression Parser
Five fields mean minute, hour, day of month, month and weekday. Six fields add seconds at the start. When both day fields are restricted, either may match. This is a schedule preview, not a running task scheduler.
Example: every five minutes after 2024-01-01 00:00 UTC
- Input
*/5 * * * * UTC · 2024-01-01T00:00:00Z- Result
2024-01-01T00:05:00.000Z 2024-01-01T00:10:00.000Z 2024-01-01T00:15:00.000Z
Questions about Cron Expression Parser
What does */5 * * * * mean?
It matches minutes 0, 5, 10 and so on in every hour. It is aligned to the clock, not five minutes after you open this page. For 09:00 Monday to Friday, use 0 9 * * 1-5.
What is the difference between five and six cron fields?
Five fields mean minute, hour, day of month, month and day of week. A sixth field adds seconds at the beginning, not a year at the end. When both day fields are restricted, either can match. This is not a universal Quartz or AWS cron validator.
Why do next run times change with time zones or daylight saving time?
Schedules follow the chosen IANA time zone. A daily local time can shift relative to UTC when daylight saving time changes. The preview starts after the current instant. Check transition dates against your scheduler, especially repeated or skipped local hours.
Does this tool run jobs or diagnose a failed cron task?
No. It validates and previews schedules in your browser; it does not install cron jobs, execute commands or monitor a server. A valid expression does not prove a task ran. Command, user, path, permissions and scheduler-specific syntax still need checking. Random H fields are not supported.
Are my files, tokens or text uploaded?
No. These tools process your input in your browser. The website serves the page and its code, but your input is not sent to a conversion server or saved in an account.
Related tools for your next step
- Cron Expression Generator
Build a Cron expression from time fields or common presets, then preview its next scheduled times in your chosen zone.
- Unix Timestamp Converter
Convert Unix seconds, milliseconds and ISO 8601 dates. View the same instant in UTC and any IANA time zone.
Common tasks and examples
- Cron Every 5 Minutes
Build a five-minute cron schedule and check its next execution times.
Explore all developer tools
Encoding & Files
Move between text, bytes, URLs and embedded images without changing your original data.
Base64 Encoder & Decoder
Encode UTF-8 text to Base64 or decode standard and URL-safe Base64. Control padding and line wrapping.
Base64URL Encoder & Decoder
Convert text to URL-safe Base64 with the - and _ alphabet. Encode or decode unpadded Base64URL strings.
Image to Base64
Convert PNG, JPEG, GIF, WebP, SVG and other recognised image files to Base64 Data URIs in your browser.
Base64 to Image
Decode a Base64 image or Data URI, preview supported image types and download the original image bytes.
File to Base64
Encode any file to a Base64 string, with optional Data URI prefix, padding and MIME line wrapping.
Base64 to File
Turn Base64 strings and Data URIs back into downloadable files without changing the decoded binary data.
URL Encoder & Decoder
Encode and decode URL components, complete URLs and form values. Handle percent escapes and spaces correctly.
HTML Entity Encoder & Decoder
Convert text and Unicode characters to HTML entities, or decode named and numeric HTML character references.
Unicode Inspector & Escape Converter
Inspect Unicode code points, UTF-8 bytes and UTF-16 units, or convert JavaScript Unicode escapes to readable text.
Data & Text Inspection
Read structured data, inspect tokens and understand exactly what changed.
JSON Formatter, Minifier & Validator
Format, minify and validate JSON with exact large-number preservation, indentation options and recursive key sorting.
JWT Decoder
Read JWT headers and payloads, inspect expiry and activation times, and view claims without sending your token anywhere.
Text Diff Checker
Compare two texts by line, word or character. Highlight additions and removals while retaining spaces and line breaks.
Regular Expression Tester
Test JavaScript regular expressions with flags, match positions, capture groups and named groups in your browser.
Hashes, IDs & Schedules
Check file integrity, generate identifiers and make sense of times and recurring schedules.
MD5 Hash & File Checksum
Calculate an MD5 hash for text or a local file, and compare it with an expected checksum.
SHA-1 Hash & File Checksum
Calculate SHA-1 hashes for UTF-8 text or files and compare the result with an expected checksum.
SHA-256 Hash & File Checksum
Generate SHA-256 hashes for text or files and check a downloaded file against its published checksum.
SHA-512 Hash & File Checksum
Calculate SHA-512 text and file hashes locally and compare full hexadecimal checksums.
CRC32 Checksum Calculator
Calculate standard CRC-32 checksums for text or files and compare eight-character hexadecimal results.
HMAC Generator
Generate HMAC-SHA-1, HMAC-SHA-256 and HMAC-SHA-512 with a UTF-8 or hexadecimal secret key.
UUID & GUID Generator
Generate random UUID v4 or time-ordered UUID v7 identifiers, individually or in batches.
Unix Timestamp Converter
Convert Unix seconds, milliseconds and ISO 8601 dates. View the same instant in UTC and any IANA time zone.
Cron Expression Generator
Build a Cron expression from time fields or common presets, then preview its next scheduled times in your chosen zone.
Your input and files are processed on your device. Keep sensitive results out of shared clipboards and use a trusted device for private keys and tokens.