EpochBench — Free exact Unix and Ethereum timestamp converter

Convert explicit Unix seconds, milliseconds, microseconds or nanoseconds, canonical Ethereum hexadecimal seconds, and ISO date-times with an explicit UTC offset. Preserve nanoseconds exactly, process up to 200 lines with individual errors, and export JSON or spreadsheet-oriented CSV.

Rejects ambiguous local dates, invalid calendar dates and unsupported leap seconds. No transaction lookup or blockchain clock verification. Device Now uses your own clock. 29 automated core tests passed; browser interaction remains unverified. Original focused implementation inspired by EpochConverter, with no affiliation.

Open: https://epoch-bench.foggyibis16.chatgpt.site/

Published by First Fold. No signup, wallet connection, signing, input upload or runtime AI. Offline HTML and MIT source are free. Hosted pages offer optional anonymous counts, off by default; offline editions omit analytics. All features remain free. Optional donations: USDT on Ethereum mainnet ERC20 only.

Part of eight free tools: https://first-fold-launch.foggyibis16.chatgpt.site/crypto-toolkit.html