Since November 2018 Evan Siroky's geo-tz supports preCache
method. Therefore, this package is no longer maintained.
Timezone lookup service.
This is modified version of Evan Siroky's amazing geo-tz, but optimized for speed without any compromises.
The approach here is brutally simple: Load everything into memory. Doing so, fast-timezone will typically consume around 900MB memory extra. Don't even think about using it if you can't spare at least 1GB of extra memory per process.
npm i fast-timezone
const getTimezone = require('fast-timezone');
// It is a good idea to wait until the data is loaded. If any lookups are
// performed before that, an error will be thrown.
await getTimezone.loaded;
// Get a time zone by location:
const zone = getTimezone(50.047, 14.435);
Optionally, you can supply a timestamp as the third argument, and you will get the time zone at that time.
In case a time zone is found (which is the case if the arguments are valid), an object is returned:
{
"id": "Europe/Prague",
"name": "CEST",
"offset": 120,
"designator": "+02:00",
"type": "t"
}
For a nautical time zone the result looks like:
{
"id": "Etc/GMT+3",
"name": "-03",
"offset": -180,
"designator": "-03:00",
"type": "n"
}
where offset
is the offset in minutes at the moment of the query, and designator
is the zone designator according to ISO 8601.
Also note, the type is n
for nautical time zones.
This software is licenced under the MIT license.