DATA, ADS & AFFILIATES

Clear about every calculation
and commercial relationship.

See how results are produced, how commercial content is separated, and what personal information is—and is not—handled.

TRANSPARENCY STANDARDCore calculations stay independent.

Answer firstNo ad between input and the primary result.
Sources shownTime and rate sources are disclosed.
Affiliates labelledCommission-earning links are clearly marked.

01 · DATA SOURCES

What sits behind each result

We distinguish external data from internal rules and state when a result is not a live transaction or operating schedule.

TIME CALCULATIONS

IANA Time Zone Database

STANDARD

City calculations use IANA identifiers and the rules bundled with browser and server runtimes, including daylight-saving and regional changes.

Coversoffset · date · DSTNoteurgent rule changes may take time to propagate

View IANA time-zone data

EXCHANGE RATES

Coinbase Exchange Rates API

UP TO 5 MIN CACHE

We obtain one-unit conversion values and may cache them for up to five minutes. Displayed rates are informational only.

Transactionsbank, card and remittance rates may differNot includedspreads · provider fees

Coinbase exchange-rate API

CALL PLANNING

Preference-based rules

RULE-BASED

We compare local time in each city with the availability windows selected by the user. Lifestyle labels are based on general time-of-day ranges.

Useslocal time · selected availabilityNotedoes not know personal calendars or sleep patterns

Recommendations are guidance and cannot guarantee another person’s actual situation.

ARRIVAL ESTIMATES

Route and distance estimate

ESTIMATE

We add an estimated city-pair flight duration to the departure time, then convert it into the destination time zone. Live airline schedules and delays are not used.

Includesestimated duration · date change · local arrivalNot includedflight number · weather · delays · actual connections

Always verify important travel plans with the airline’s official schedule.

02 · COMMERCIAL RELATIONSHIPS

How ads and affiliates work

Monetization never changes the independence of the calculation.

Result-first placement

Ads are never placed between inputs and the primary result, or where they interrupt use.

Clear affiliate labels

Some links may earn us a commission after a purchase. Those relationships are clearly labelled.

Independent results

Advertisers and partners cannot alter time or exchange-rate results or recommendation order.

How Google advertising cookies work Manage ad personalization

03 · PRIVACY

No account, only what is needed

No member account is created. Language, hour format, and a device fallback for favorite cities may be stored in your browser.

To provide favorite cities, we may aggregate city pairs, usage counts, and the last-used time under an anonymous browser key.
IP addresses are not used for identification. A random browser ID is converted into a non-reversible server-side key, and the original ID is not stored in Google Sheets.
Clearing site data, using private browsing, or changing browsers creates a new anonymous ID and favorites history.
If ads are enabled, third parties may use cookies for delivery and measurement.
A consent interface is provided where legally required.

Google AdSense disclosure requirements

04 · OPEN SOURCE

Open-source assets

Flags and interface icons come from established open-source projects. Copyright and trademark rights remain with their owners.

flag-icons 7.5.0MIT LicenseGitHub Lucide React 1.24.0ISC · MITWebsite