Summary of Common Usages of Moment.js

Moment.js is a lightweight JavaScript time library, which facilitates the operation of time in daily development and improves the development efficiency.

In daily development, the following operations are usually performed on time: acquiring time, setting time, formatting time, comparing time and so on. Next, I will sort out Doc s in Moment.js according to these operations, so as to facilitate learning and future reference.

Acquisition time

Start of Time
```
moment().startOf(String)
```
- Get today's 0:00, 0 seconds
```
moment().startOf('day')
```
- Get 0:0, 0 seconds on the first day of the week (Sunday)
```
moment().startOf('week')
```
- Get 10:00 p.m. and 0 seconds on Monday this week
```
moment().startOf('isoWeek')
```
- Get 0:0, 0 seconds on the first day of the current month
```
moment().startOf('month')
```
End of Time
```
moment().endOf(String)
```
- Get today at 23:59:59:59
```
moment().endOf('day')
```
- Get 23:59, 59 seconds on the last day of the week (Saturday)
```
moment().endOf('week')
```
- Get 23:59:59 seconds on Sunday this week
```
moment().endOf('isoWeek')
```
- Get 23:59:59 seconds on the last day of the current month
```
moment().endOf('month')
```
Days in Month
```
moment().daysInMonth()
```
- Get the total number of days in the current month
```
moment().daysInMonth() 
```

Timestamp

Get the timestamp (in seconds)

moment().format('X') // Return value is string type
moment().unix() // Return value is numeric

Get the timestamp (in milliseconds)

moment().format('x') // Return value is string type
moment().valueOf() // Return value is numeric

Get Time

Year of acquisition
```
moment().year()
moment().get('year')
```

Get month

moment().month() (0~11, 0: January, 11: December)
moment().get('month')

Get one day in a month
```
moment().date()
moment().get('date')
```

Get a day of the week

moment().day() (0~6, 0: Sunday, 6: Saturday)
moment().weekday() (0~6, 0: Sunday, 6: Saturday)
moment().isoWeekday() (1~7, 1: Monday, 7: Sunday)
moment().get('day')
mment().get('weekday')
moment().get('isoWeekday')

Acquisition hours
```
moment().hours()
moment().get('hours')
```

Get minutes

moment().minutes()
moment().get('minutes')

Get seconds

moment().seconds()
moment().get('seconds')

Get the current year, month, day, time, second

moment().toArray() // [years, months, date, hours, minutes, seconds, milliseconds]
moment().toObject() // {years: xxxx, months: x, date: xx ...}

Setup time

Set Time

moment().year(Number), moment().month(Number)...
moment().set(String, Int)
moment().set(Object)

Set Year

moment().year(2019)
moment().set('year', 2019)
moment().set({year: 2019})

Set month

moment().month(11) (0~11, 0: January, 11: December)
moment().set('month', 11)

Setting up a day in a month

moment().date(15)
moment().set('date', 15)

Setting up a day of the week

moment().weekday(0) // Set the date for the first day of the week (Sunday)
moment().isoWeekday(1) // Set the date for Monday this week
moment().set('weekday', 0)
moment().set('isoWeekday', 1)

Set hours

moment().hours(12)
moment().set('hours', 12)

Set minute

moment().minutes(30)
moment().set('minutes', 30)

Set seconds

moment().seconds(30)
moment().set('seconds', 30)

Add Time

moment().add(Number, String)
moment().add(Object)

Set Year

moment().add(1, 'years')
moment().add({years: 1})

Set month
```
moment().add(1, 'months')
```
Setting date
```
moment().add(1, 'days')
```
Week set up
```
moment().add(1, 'weeks')
```
Set hours
```
moment().add(1, 'hours')
```
Set minute
```
moment().add(1, 'minutes')
```
Set seconds
```
moment().add(1, 'seconds')
```

Subtract Time

moment().subtract(Number, String)
moment().subtract(Object)

Set Year

moment().subtract(1, 'years')
moment().subtract({years: 1})

Set month
```
moment().subtract(1, 'months')
```
Setting date
```
moment().subtract(1, 'days')
```
Week set up
```
moment().subtract(1, 'weeks')
```
Set hours
```
moment().subtract(1, 'hours')
```
Set minute
```
moment().subtract(1, 'minutes')
```
Set seconds
```
moment().subtract(1, 'seconds')
```

Formatting time

Format Time
```
moment().format()
moment().format(String)
```
- Format year, month and day:'xx XX year, XX month, XX day'
```
moment().format('YYYY year MM month DD day')
```
- Formatting year, month and day:'xx xx-xx-xx'
```
moment().format('YYYY-MM-DD')
```
- Format time-seconds (24-hour system):'xx time XX minutes XX seconds'
```
moment().format('HH time mm branch ss second')
```
- Format time-seconds (12-hour system):'xx: xx:xx:xx am/pm'
```
moment().format('hh:mm:ss a')
```
- Format timestamps (in seconds)
```
moment().format('X') // Return value is string type
```
- Formatting timestamps (in milliseconds)
```
moment().format('x') // Return value is string type
```

Comparison time

Difference

moment().diff(Moment|String|Number|Date|Array)

Get the time difference between two dates

let start_date = moment().subtract(1, 'weeks')
let end_date = moment()

end_date.diff(start_date) // Return milliseconds

end_date.diff(start_date, 'months') // 0
end_date.diff(start_date, 'weeks') // 1
end_date.diff(start_date, 'days') // 7
start_date.diff(end_date, 'days') // -7

Convert to JavaScript native Date object

moment().toDate()
new Date(moment())

Converting Moment Time to JavaScript Native Date Object

let m = moment()
let nativeDate1 = m.toDate()
let nativeDate2 = new Date(m)

String(nativeDate1) === String(nativeDate2) // true

actual combat

Get from yesterday 0:0:0 to yesterday 23:59:59, format: [milliseconds, milliseconds]
Get the time range from last Monday to last Sunday in the format: [seconds, seconds]
Get the time range of the first and last day of last month in format: [YYYY-MM-DD, YYYY-MM-DD]

Author: zhouqichao
Links: https://www.jianshu.com/p/9c10543420de
Source: Brief Book
The copyright of the brief book belongs to the author. For any form of reprinting, please contact the author for authorization and indicate the source.

Posted by RynMan on Mon, 06 May 2019 02:00:42 -0700

Programmer Group

Summary of Common Usages of Moment.js