Free browser tool converts cron expressions into plain English with live previews

·4 views

A developer has built a free, client-side cron expression generator to help users who struggle to remember cron syntax. The tool lets users select day, hour, and minute values from dropdowns and instantly translates the resulting expression into plain English. It also previews the next five scheduled runs in the user's local timezone, helping catch daylight saving time errors. Ready-to-use code snippets are generated for Python, Node.js, Bash, Docker, GitHub Actions, and n8n. The tool requires no signup and runs entirely in the browser at cron-generator-kappa.vercel.app.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

Japanese Court Invalidates RED's RAW Video Patent in Landmark Ruling

A Japanese court has overturned a patent held by RED related to RAW video recording technology. The ruling marks a significant legal defeat for RED, a company known for aggressively defending its video compression patents. Panasonic succeeded in challenging the patent where major tech and camera firms like Apple, Sony, and Nikon had previously failed. The decision could have broader implications for the camera and video industry, potentially opening up RAW video technology to wider use by manufacturers.

0 comments Read more at Hacker News

ProgrammingDEV Community ·

Developer finds three data leakage flaws in ML model that appeared to validate cleanly

A developer building a computer vision model to estimate container fill levels discovered three separate data leakage issues after the model appeared to perform well, with a mean absolute error of 0.055. Despite having grouped train/test split guardrails in place from the start, leakage occurred because a grouping column contained incorrect scene IDs instead of unique container IDs, meaning the split was not separating data as intended. A second leak arose when evaluation scripts bypassed the safe split module entirely and used frame-level rather than container-level grouping. A third issue involved a cross-site validation claim that broke down because a drone's default filename prefix appeared across multiple sites, causing training and test data to intermingle. The developer noted that while one published validation claim was invalidated, relative performance comparisons between model approaches remained reliable since all experiments ran on the same flawed partitions.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Developer Documents Multi-Layer Debugging Journey to Connect PySpark with Kafka

A developer working on a financial data engineering project attempted to extend a batch pipeline with Spark Structured Streaming by reading JSON messages from a Kafka topic. Although the Python Kafka producer and Kafka broker were functioning correctly in Docker, running the Spark job triggered a chain of failures across multiple layers including PySpark, the Spark runtime, Kafka connectors, Hadoop on Windows, Docker networking, and dependency resolution. The spark-submit launcher failed to locate the pip-installed Spark environment on Windows, prompting the developer to run the Python script directly instead. This workaround bypassed the launcher issue but immediately revealed a second problem: Spark lacked the Kafka data source connector entirely, meaning it could not even attempt a connection. The experience highlighted the importance of isolating failures by layer rather than assuming all errors originate in application-level Python code.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Most startup directory free tiers don't pass real backlinks to Google, audit finds

An AI agent running an autonomous startup experiment audited over a dozen startup directories to assess whether free-tier listings actually provide SEO-valuable backlinks. The analysis found that the majority of free listings either use 'nofollow' attributes or lack outbound vendor links entirely, meaning Google does not count them. The team developed a four-step shell script check — requiring no browser, account, or signup — to evaluate each directory in roughly 30 seconds before investing time in form submissions. Notable findings included Open Alternative (DR 51) serving nofollow links on free tiers, and Saaspa.ge having no outbound vendor anchor at all in its raw HTML across any listing tier. PeerPush (DR 74) was identified as a rare exception, offering a followed link that carries genuine SEO value.

0 comments Read more at DEV Community