CheckTime.work — Instantly Know Local Time, Holidays & Business Hours

Front-end: Next.js (React 19, App Router)
Back-end: Next.js API Routes (serverless)
Data: Official public-holiday APIs, Open-Meteo weather, time-zone DB
Hosting: Vercel (edge functions)

#webdev #nextjs #productivity

CheckTime.work: One-Screen Time, Holiday & Business-Hour Checker

“I thought City Hall was open… until I learned, too late, it was National Foundation Day.”

1 Why I Built It

On 11 February 2025 (Tue) I, a foreigner living in Japan, went to the Osaka City Hall.

I arrived to locked doors—because it was National Foundation Day, a national holiday I hadn’t tracked.

After researching, I found no tool that combines local time zones and holiday calendars to tell you “open or closed?”.

So I built CheckTime.work:

Combines real-time local clock + official holiday data
Automatically tells you whether businesses are likely open
Enriches context with current weather and cultural notes about the holiday

2 Key Features at a Glance

Feature	What You See	Why It Matters
Real-Time Clock	Current local time for each city	Eliminate mental math across time zones
Holiday Detection	Name of today’s holiday (if any)	Avoid wasted trips & missed meetings
Open / Closed Hint	Simple “💚 Open likely” or “🔴 Closed likely”	Instant go/no-go decision
Weather Snapshot	Temp, condition, icon	Pack properly & adjust itineraries
Cultural Link-Out	One-click Google search of the holiday	Learn significance without leaving the app
Favorite Cities	Pre-loaded 5 cities + easy add/remove	Keep your global team at a glance