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Dev Utilities
Dev Utilities Pro · Bedrocka Tools

Developer utilities without the SaaS paywall.

Cron expressions, Unix timestamps, number base conversion — the tools every developer reaches for multiple times a week. Most online versions are thin wrappers with no spec citations, no algorithm transparency, and no human accountability. This site is the opposite: every formula cites the primary standard, every calculator is reviewed quarterly by a named engineer.

Primary-source citations
Reviewed by Byron Malone
3calculators live
2explainer articles
4cron dialects documented
100%primary-source cited
Try the Cron Expression Builder →How this site is built

Calculators

Pick the tool you actually need.

Scheduling

Time & Date

Number Systems

Learn

Concepts behind the utilities.

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What makes this different

Three things every Bedrocka Tools site does that the incumbents don't.

Principle I

Open-source math

Every calculator's formula is published as TypeScript with Vitest tests in a public repo. Click "View source" in any math accordion to see the actual implementation. Crontab.guru and EpochConverter hide their logic. We publish it.
Browse the math →
Principle II

Primary-source citations only

Every field range, epoch definition, and encoding rule links to the original document — IEEE Std 1003.1, RFC 3339, RFC 4648, IANA timezone database, Knuth TAOCP, Intel SDM. No "according to industry sources" hedging. The citation is the proof.
Read the methodology →
Principle III

Named engineer, real bio

Reviewed and signed by Byron Malone— a decade of working at the intersection of software systems and operational reality. Not a content mill.
Read Byron's bio →

Part of Bedrocka Tools

Dev Utilities Pro is Site #15 in the Bedrocka Tools portfolio — a family of source-cited calculator sites built on the same open-source formula library. Every site shares the same methodology, the same primary-source discipline, and the same named reviewer.

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