is-dst

Checks if local clocks are currently adjusted for daylight saving time. ☀️

Install

Install with yarn:

$ yarn add is-dst

Or with npm:

$ npm install --save is-dst

Usage

const isDST = require('is-dst')
 
/*
 * Examples invoked on February 5th, 2017 in US/Eastern timezone
 */
 
isDST(new Date('January 1, 2017'))
//=> false
 
isDST(new Date('July 1, 2017'))
//=> true
 
isDST()
//=> false

API

isDST([,date])

date

Type: Date
Default: new Date()

The date to check for DST.

Assumptions

• Returns false for time zones that do not observe DST.

• Assumes that January 1st and July 1st will never both be DST or not DST in a given year. This is currently true for all time zones that observe DST.

License

MIT © Brandon Smith