Guides
In-depth, practical guides on time zones, focus techniques, date math, and more — each one links directly to the free tools that put it into practice.
How to Convert Time Zones Without Getting Confused
A plain-English guide to converting between time zones correctly, including the daylight saving time trap that catches almost everyone at least once.
The Pomodoro Technique: A Complete Guide
What the Pomodoro Technique actually is, where the name comes from, and how to use focused work intervals to get more done without burning out.
How to Calculate Your Exact Age (and Why It's Trickier Than It Looks)
Why calculating an exact age in years, months, and days is harder than simple subtraction, and how to get it right every time.
Unix Timestamps Explained: A Plain-English Guide
What a Unix timestamp actually is, why computers use it, and how to convert one into a human-readable date.
How to Schedule Meetings Across Time Zones Without the Headache
A practical guide to finding meeting times that work across multiple time zones, without converting each person's time by hand.
Daylight Saving Time, Explained
Why clocks change twice a year, which places don't observe it, and how to keep track of when the next transition happens.
A Guide to Interval Training and the Timers Behind It
Why structured work-and-rest intervals outperform continuous effort, and which timer fits which kind of interval training.
How to Calculate Business Days and Deadlines Correctly
The most common mistakes people make counting business days, and how to calculate delivery dates and deadlines accurately.
Cron Jobs Explained: A Plain-English Guide to Cron Syntax
How cron's five-field scheduling syntax actually works, why it's genuinely hard to read at a glance, and how to translate it into plain English.
Moon Phases Explained: The Science Behind the Cycle
What actually causes the moon's phases, how long the cycle takes, and how to find the phase for any date.