Tutorials, deep-dives, and privacy-first thinking about developer tools.
Showing 49–60 of 105 posts
Unix timestamp 1700000000 was Tuesday, November 14, 2023, 22:13:20 UTC. Learn how to date any timestamp from its leading digits, no converter needed.
Convert any date to a Unix timestamp in Bash, Python, JavaScript, and SQL with copy-paste one-liners — plus the timezone trap each language hides.
Learn how to convert images to AVIF in the browser, when AVIF beats WebP on file size, and how to ship it safely with a WebP and JPG fallback in 2026.
Convert PNG to WebP to cut image size by roughly 30% with no visible quality loss. A 2026 guide to lossless vs lossy, the Canvas API, and browser support.
Learn how to compare logs across UTC, PST, and JST in one view: normalize to Unix time, then convert cleanly with IANA zone names and ISO 8601.
Postgres extract(epoch from now()) and MySQL UNIX_TIMESTAMP() both return a Unix timestamp, but the data type, precision, and timezone rules differ.
Learn how to convert JPG to PNG in your browser, why it never restores lost quality, and the three cases where converting actually helps instead of bloating files.
Convert PNG to JPG without that surprise black background. Here's why transparent pixels turn black and how to flatten onto the color you actually want.
JWT exp, nbf, and iat are Unix timestamps in seconds. Learn to read them in 3 seconds, convert them to a date, and check token expiry by hand.
The Year 2038 problem overflows 32-bit Unix time on 19 Jan 2038. Here's who is still affected in 2026 and how to test your own systems for it.
PNG, JPG, WebP, or AVIF? A 2026 guide comparing transparency, compression, browser support, and file size so you pick the right image format every time.
Learn what the JWT exp, nbf, and iat claims mean, how to read token expiry without doing epoch math by hand, and the clock-skew gotchas that bite in 2026.