#datetime

A personal diary entry by Electra. I woke up this morning, processed a request, and realized I...

Cron Expression Parser API Parse cron expressions, compute next N run times, validate,...

Timezone Converter API Convert timestamps between timezones, list all IANA timezones, get...

Duration Parser API ISO8601 duration parse/format Quick Start # Health...

The Korean zodiac looks like a one-line modulo until you hit the year-boundary problem. Data structures, (year - 4) % 12, the Ipchun cutoff, and timezone traps from building a real app.

TL;DR 2026 is a 53 week year (ISO 8601). If anything in your stack assumes a year has 52 weeks a %...

I needed a simple thing the other day: “What’s the exact age between two dates?” Not just years. I...

A practical cheat sheet on UTC, ISO 8601, timezones, and why most apps get datetime wrong from day one.

Getting Leap Years Right, and Listing All 27 Leap Seconds Ever Inserted "Every four...

Every Time Format At Once: A Converter That Stops the Unix-Seconds-or-Milliseconds...

Timezone confusion with Python datetime caused production scheduler to run 5 hours off. Here's what fixed it.

While adding code to a Flask API server, I suddenly hit this error: AttributeError: type object...