How to use

Yarn

yarn add epoch-days

NPM

npm install --save epoch-days

API

toEpochDate(millis)

Returns number of a day

date: number

const TIMEZONE = 'Etc/GMT-0'
const DATE = moment.tz('2019-07-07', TIMEZONE).endOf('day')
const DATE_IN_MS = DATE.clone().tz(TIMEZONE).valueOf()
const EPOCH_DAY = 18084

describe('toEpochDate', () => {
  it('should return valid epoch day', () => {
    expect(toEpochDate(DATE_IN_MS)).toEqual(EPOCH_DAY)
  })

  it('should return valid epoch day for moment object', () => {
    const epoch = toEpochDate(DATE.clone().tz(TIMEZONE))
    expect(epoch > 0).toBe(true)
  })

  it('should return NaN for string', () => {
    expect(toEpochDate(DATE.clone().tz(TIMEZONE).toString())).toBe(NaN)
  })
})

toEpochDate(dayNumber)

Returns milliseconds of the beginning of the day equal to midnight in your time zone. Convert the time to the correct time zone for a more accurate calculation.

dayNumber: number

const TIMEZONE = 'Etc/GMT-0'
const DATE = moment.tz('2019-07-07', TIMEZONE).endOf('day')
const EPOCH_DAY = 18084
const DATE_IN_MS = DATE.clone().tz(TIMEZONE).valueOf()

describe('toEpochDate', () => {
  it('should return valid epoch day', () => {
    expect(toEpochDate(DATE_IN_MS)).toEqual(EPOCH_DAY)
  })

  it('should return valid epoch day for moment object', () => {
    const epoch = toEpochDate(DATE.clone().tz(TIMEZONE))
    expect(epoch > 0).toBe(true)
  })

  it('should return NaN for string', () => {
    expect(toEpochDate(DATE.clone().tz(TIMEZONE).toString())).toBe(NaN)
  })
})

getPreviousWorkday(date)

The function returns the previous working day of the week, adjusted for the weekend.

date: number (optional) - Date.now by default

it('should returns friday if today is monday', () => {
  const prev = getPreviousWorkday('2019-08-05').toISOString()
  expect(prev).toEqual('2019-08-02T00:00:00.000Z')
})

it('should returns friday if today is sunday', () => {
  const prev = getPreviousWorkday('2019-08-04').toISOString()
  expect(prev).toEqual('2019-08-02T00:00:00.000Z')
})

it('should returns friday if today is saturday', () => {
  const prev = getPreviousWorkday('2019-08-03').toISOString()
  expect(prev).toEqual('2019-08-02T00:00:00.000Z')
})

it('should returns monday if today is tuesday', () => {
  const prev = getPreviousWorkday('2019-08-06').toISOString()
  expect(prev).toEqual('2019-08-05T00:00:00.000Z')
})