Class Dayjs

Returns a cloned Day.js object with a specified amount of time added.

dayjs().add(7, 'day')// => Dayjs

Units are case insensitive, and support plural and short forms.

Docs: https://day.js.org/docs/en/manipulate/add

All Day.js objects are immutable. Still, dayjs#clone can create a clone of the current object if you need one.

dayjs().clone()// => Dayjs
dayjs(dayjs('2019-01-25')) // passing a Dayjs object to a constructor will also clone it

Docs: https://day.js.org/docs/en/parse/dayjs-clone

Get the date of the month.

dayjs().date()// => 1-31

Docs: https://day.js.org/docs/en/get-set/date

Set the date of the month.

Accepts numbers from 1 to 31. If the range is exceeded, it will bubble up to the next months.

dayjs().date(1)// => Dayjs

Docs: https://day.js.org/docs/en/get-set/date

Get the day of the week.

Returns numbers from 0 (Sunday) to 6 (Saturday).

dayjs().day()// 0-6

Docs: https://day.js.org/docs/en/get-set/day

Set the day of the week.

Accepts numbers from 0 (Sunday) to 6 (Saturday). If the range is exceeded, it will bubble up to next weeks.

dayjs().day(0)// => Dayjs

Docs: https://day.js.org/docs/en/get-set/day

Get the number of days in the current month.

dayjs('2019-01-25').daysInMonth() // 31

Docs: https://day.js.org/docs/en/display/days-in-month

This indicates the difference between two date-time in the specified unit.

To get the difference in milliseconds, use dayjs#diff

const date1 = dayjs('2019-01-25')
const date2 = dayjs('2018-06-05')
date1.diff(date2) // 20214000000 default milliseconds
date1.diff() // milliseconds to current time

To get the difference in another unit of measurement, pass that measurement as the second argument.

const date1 = dayjs('2019-01-25')
date1.diff('2018-06-05', 'month') // 7

Units are case insensitive, and support plural and short forms.

Docs: https://day.js.org/docs/en/display/difference

Returns a cloned Day.js object and set it to the end of a unit of time.

dayjs().endOf('month')// => Dayjs

Units are case insensitive, and support plural and short forms.

Docs: https://day.js.org/docs/en/manipulate/end-of

Get the formatted date according to the string of tokens passed in.

To escape characters, wrap them in square brackets (e.g. [MM]).

dayjs().format()// => current date in ISO8601, without fraction seconds e.g. '2020-04-02T08:02:17-05:00'
dayjs('2019-01-25').format('[YYYYescape] YYYY-MM-DDTHH:mm:ssZ[Z]')// 'YYYYescape 2019-01-25T00:00:00-02:00Z'
dayjs('2019-01-25').format('DD/MM/YYYY') // '25/01/2019'

Docs: https://day.js.org/docs/en/display/format

String getter, returns the corresponding information getting from Day.js object.

In general:

dayjs().get(unit) === dayjs()[unit]()

Units are case insensitive, and support plural and short forms.

dayjs().get('year')
dayjs().get('month') // start 0
dayjs().get('date')

Docs: https://day.js.org/docs/en/get-set/get

Get the hour.

dayjs().hour()// => 0-23

Docs: https://day.js.org/docs/en/get-set/hour

Set the hour.

Accepts numbers from 0 to 23. If the range is exceeded, it will bubble up to the next day.

dayjs().hour(12)// => Dayjs

Docs: https://day.js.org/docs/en/get-set/hour

This indicates whether the Day.js object is after the other supplied date-time.

dayjs().isAfter(dayjs('2011-01-01')) // default milliseconds

If you want to limit the granularity to a unit other than milliseconds, pass it as the second parameter.

dayjs().isAfter('2011-01-01', 'year')// => boolean

Units are case insensitive, and support plural and short forms.

Docs: https://day.js.org/docs/en/query/is-after

This indicates whether the Day.js object is before the other supplied date-time.

dayjs().isBefore(dayjs('2011-01-01')) // default milliseconds

If you want to limit the granularity to a unit other than milliseconds, pass it as the second parameter.

dayjs().isBefore('2011-01-01', 'year')// => boolean

Units are case insensitive, and support plural and short forms.

Docs: https://day.js.org/docs/en/query/is-before

This indicates whether the Day.js object is the same as the other supplied date-time.

dayjs().isSame(dayjs('2011-01-01')) // default milliseconds

If you want to limit the granularity to a unit other than milliseconds, pass it as the second parameter.

dayjs().isSame('2011-01-01', 'year')// => boolean

Docs: https://day.js.org/docs/en/query/is-same

This returns a boolean indicating whether the Day.js object contains a valid date or not.

dayjs().isValid()// => boolean

Docs: https://day.js.org/docs/en/parse/is-valid

Get the milliseconds.

dayjs().millisecond()// => 0-999

Docs: https://day.js.org/docs/en/get-set/millisecond

Set the milliseconds.

Accepts numbers from 0 to 999. If the range is exceeded, it will bubble up to the next seconds.

dayjs().millisecond(1)// => Dayjs

Docs: https://day.js.org/docs/en/get-set/millisecond

Get the minutes.

dayjs().minute()// => 0-59

Docs: https://day.js.org/docs/en/get-set/minute

Set the minutes.

Accepts numbers from 0 to 59. If the range is exceeded, it will bubble up to the next hour.

dayjs().minute(59)// => Dayjs

Docs: https://day.js.org/docs/en/get-set/minute

Get the month.

Months are zero indexed, so January is month 0.

dayjs().month()// => 0-11

Docs: https://day.js.org/docs/en/get-set/month

Set the month.

Months are zero indexed, so January is month 0.

Accepts numbers from 0 to 11. If the range is exceeded, it will bubble up to the next year.

dayjs().month(0)// => Dayjs

Docs: https://day.js.org/docs/en/get-set/month

Get the seconds.

dayjs().second()// => 0-59

Docs: https://day.js.org/docs/en/get-set/second

Set the seconds.

Accepts numbers from 0 to 59. If the range is exceeded, it will bubble up to the next minutes.

dayjs().second(1)// Dayjs

Generic setter, accepting unit as first argument, and value as second, returns a new instance with the applied changes.

In general:

dayjs().set(unit, value) === dayjs()[unit](value)

Units are case insensitive, and support plural and short forms.

dayjs().set('date', 1)
dayjs().set('month', 3) // April
dayjs().set('second', 30)

Docs: https://day.js.org/docs/en/get-set/set

Returns a cloned Day.js object and set it to the start of a unit of time.

dayjs().startOf('year')// => Dayjs

Units are case insensitive, and support plural and short forms.

Docs: https://day.js.org/docs/en/manipulate/start-of

Returns a cloned Day.js object with a specified amount of time subtracted.

dayjs().subtract(7, 'year')// => Dayjs

Units are case insensitive, and support plural and short forms.

Docs: https://day.js.org/docs/en/manipulate/subtract

To get a copy of the native Date object parsed from the Day.js object use dayjs#toDate.

dayjs('2019-01-25').toDate()// => Date

To format as an ISO 8601 string.

dayjs('2019-01-25').toISOString() // '2019-01-25T02:00:00.000Z'

Docs: https://day.js.org/docs/en/display/as-iso-string

To serialize as an ISO 8601 string.

dayjs('2019-01-25').toJSON() // '2019-01-25T02:00:00.000Z'

Docs: https://day.js.org/docs/en/display/as-json

Returns a string representation of the date.

dayjs('2019-01-25').toString() // 'Fri, 25 Jan 2019 02:00:00 GMT'

Docs: https://day.js.org/docs/en/display/as-string

This returns the Unix timestamp (the number of seconds since the Unix Epoch) of the Day.js object.

dayjs('2019-01-25').unix() // 1548381600

This value is floored to the nearest second, and does not include a milliseconds component.

Docs: https://day.js.org/docs/en/display/unix-timestamp

Get the UTC offset in minutes.

dayjs().utcOffset()

Docs: https://day.js.org/docs/en/manipulate/utc-offset

This returns the number of milliseconds since the Unix Epoch of the Day.js object.

dayjs('2019-01-25').valueOf() // 1548381600000
+dayjs(1548381600000) // 1548381600000

To get a Unix timestamp (the number of seconds since the epoch) from a Day.js object, you should use Unix Timestamp dayjs#unix().

Docs: https://day.js.org/docs/en/display/unix-timestamp-milliseconds

Get the year.

dayjs().year()// => 2020

Docs: https://day.js.org/docs/en/get-set/year

Set the year.

dayjs().year(2000)// => Dayjs

Docs: https://day.js.org/docs/en/get-set/year