What are the time-related functions in nodejs?

Time functions in nodejs: 1. moment(); 2. format(); 3. diff(); 4. startOf(); 5. endOf(); 6. add(); 7. subtract(); 8. dayjs(); 9. year(); 10. toDate() and so on.

The operating environment of this tutorial: windows7 system, nodejs version 12.19.0, DELL G3 computer.

moment time function application

// 格式化时间
moment('2017-09-01').format('YYYYMMDD')
// 当前时间 
moment().format('YYYY-MM-DD HH:mm:ss');
// 当前时间
now = moment();
// 格式化结束时间
endMoment = moment(endDate, 'YYYYMM');
// 结束时间距离当前时间的间隔
now.diff(endMoment, 'months')

// 前1周
startDate = moment(now.join(''), 'YYYYw').startOf('week').add(1, 'day').format('YYYY-MM-DD 00:00:00');
endDate = moment(now.join(''), 'YYYYw').endOf('week').add(1, 'day').format('YYYY-MM-DD 23:59:59');
// 前2周
lastStartDate = moment(now.join(''), 'YYYYw').subtract(1, 'week').startOf('week').add(1, 'day').format('YYYY-MM-DD 00:00:00');
lastEndDate = moment(now.join(''), 'YYYYw').subtract(1, 'week').endOf('week').add(1, 'day').format('YYYY-MM-DD 23:59:59');
// 前1月
startDate = moment(now.join(''), 'YYYYMM').startOf('month').format('YYYY-MM-DD 00:00:00');
endDate = moment(now.join(''), 'YYYYMM').endOf('month').format('YYYY-MM-DD 23:59:59');
// 前2月
lastStartDate = moment(now.join(''), 'YYYYMM').subtract(1, 'month').startOf('month').format('YYYY-MM-DD 00:00:00');
lastEndDate = moment(now.join(''), 'YYYYMM').subtract(1, 'month').endOf('month').format('YYYY-MM-DD 23:59:59');


// 一年的开始日期
const startYear = dayjs().startOf('year');
// 一年的结束日期
const endYear = dayjs().endOf('year');

// 当前时间
const current = dayjs().startOf('day');
// 一年已经过去了多少天 不连今天
const yearStartDay = current.diff(dayjs().startOf('year'), "day");
// 一年还剩余多少天
const yearEndDay = dayjs().endOf('year').diff(current, "day");

dayjs time function application

current time

const current = dayjs();
// 当前年
return dayjs().year();

format() returns formatted according to the passed placeholder date.

dayjs('2019-01-25').format('DD/MM/YYYY') // '25/01/2019'
dayjs('2019-01-25').format('YYYY-MM-DD HH:mm:ss') // '2019-01-25 00:00:00'

##YY 18Year, two digitsYYYY2018Year, four digitsM1-12Month, starting from 1MM01-12month, two digitsMMMJan-Decmonth, English abbreviationD1-31日DD01-31Day, two digitsH0-2324 hours HH00-2324 hours, two digitsh1-12 12 hours##hhmmmsssSSSSSSZZZAaDostartOf() sets a time Start, endOf() sets the end of a time

Identification	Example	Description
01-12	12 hours, two digits
0-59	Minutes
00-59	Minutes, two digits
0-59	seconds
00-59	Seconds, two digits
0-9 milliseconds	(hundreds), one digit
00-99	Milliseconds (tens), two digits
000-999	Milliseconds, three digits
-05:00	UTC offset
-0500	UTC offset, two digits
AM / PM	morning/afternoon, uppercase
am / pm	morning/afternoon, lowercase
1st… 31st	The date and serial number of the month

// 设置一个时间的开始
dayjs().startOf('year');
// 设置一个时间的末尾
dayjs().endOf('month')

UnityearquartermonthweekisoWeekdate##dayd 00:00 of the dayhourhCurrent time, 0 minutes, 0 seconds, 0 millisecondsminutemCurrent time, 0 seconds, 0 millisecondss

// 增加七天
dayjs().add(7, 'day')
// 减去
dayjs().subtract(7, 'year')

subtract()decrease time

dayjs().subtract(1, 'day');

Abbreviation	Details
y	January 1st of this year at 00:00 am
Q	00:00 am on the 1st day of the first month of this quarter (depends on the QuarterOfYear plug-in)
M	00:00 am on the 1st of this month
w	00:00 am on the first day of the week
	The first day of the week at 00:00 am (according to ISO 8601) (depends on IsoWeek plug-in)
D	00:00 on that day
		##second
Current time, 0 milliseconds		##Add()increase time

toDate() return native The time object

dayjs().toDate();

For more node-related knowledge, please visit:

nodejs tutorial

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