Moment.js Cheatsheet - Date & Time

This reference is for JavaScript developers doing everyday date work — formatting a timestamp for display, adding days to an expiry, comparing two dates, or showing "3 days ago". It walks creation from strings, timestamps, and object literals (mind the zero-based month), formatting tokens, add/subtract and startOf/endOf snapping, comparison helpers, relative time, and timezone handling with moment-timezone. Note that moment is in maintenance mode; prefer native Date or Day.js for new code. After reading you should be able to parse, format, shift, and compare dates, and render friendly relative strings.

Languages·39 commands·Last updated 2026-07-21

Creating Dates 5

moment()

Current time

moment("2024-01-15")

Parse from a string

moment("2024-01-15", "YYYY-MM-DD")

Parse with an explicit format

moment(Date.now())

Create from a timestamp

moment({ year: 2024, month: 0, day: 15 })

Create from an object

Formatting 5

moment().format("YYYY-MM-DD")

2024-01-15

moment().format("HH:mm:ss")

14:30:00

moment().format("dddd, MMMM Do YYYY")

Monday, January 15th 2024

moment().format("LLL")

Localized long format

moment().toISOString()

ISO 8601 format

Manipulating Dates 5

moment().add(7, "days")

Add 7 days

moment().subtract(1, "month")

Subtract 1 month

moment().startOf("day")

Set to start of day (00:00:00)

moment().endOf("month")

Set to end of month (23:59:59)

moment().year(2025).month(0)

Set year and month

Queries & Comparison 8

moment().isBefore(other)

Whether before another

moment().isAfter(other)

Whether after another

moment().isSame(other, "day")

Whether on the same day

moment().isBetween(start, end)

Whether within a range

moment().isSameOrBefore(other)

Same or before

moment().isSameOrAfter(other)

Same or after

moment().diff(other, "days")

Compute the difference (in a unit)

moment().isValid()

Whether a valid date

Relative Time 6

moment().fromNow()

3 days ago

moment().fromNow(true)

3 days (no 'ago')

moment().toNow()

in 3 days

moment().calendar()

Today 14:30 / Yesterday 09:00

moment().from(other)

Offset relative to another moment

moment().to(other)

Offset to another moment

Timezones & Localization 5

moment().utc()

Convert to UTC

moment().local()

Convert to local time

moment.locale("zh-cn")

Set Chinese locale

moment.tz("2024-01-15", "America/New_York")

Specify a timezone (needs moment-timezone)

moment().utcOffset(480)

Set a UTC offset (minutes)

Duration 5

moment.duration(100, "minutes")

Create a duration from minutes

moment.duration({ hours: 2, minutes: 30 })

Create a duration from an object

duration.asHours()

Convert to total hours

duration.humanize()

Human-friendly display (e.g. '2 hours')

duration.add(1, "hour")

Add to a duration

Tips

Moment.js is in maintenance mode; new projects should prefer dayjs (compatible API, smaller size).
Months are zero-indexed: 0 = January, 11 = December.
Format tokens: YYYY=year, MM=month, DD=day, HH=hour, mm=minute, ss=second.
Date operations return a new moment object; the original is immutable.
fromNow/toNow auto-pick a unit (seconds, minutes, hours, days, months, years).
diff returns milliseconds by default; pass a second arg for the unit (days/months/years).
Duration measures a length of time, not a point in time; humanize outputs friendly text.

Official References

Each command links to its official documentation below, so you can verify the latest usage and read deeper.

MDN JavaScript Docs

Maintained by LaoHand

Publicly updated on Jul 21, 2026, continuously proofread against official docs.

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