@funboxteam/chronos
v5.0.3
Published
One library to rule the time
Downloads
89
Keywords
Readme
Features
- Immutable & pure function per file. Every function does not have side effects, nor mutates the params. If you use a function, only this function is added to your bundle, not the whole lib.
- ESM & CommonJS. Works in Node.js and browser. Setup the target browsers for transpiling ES6 by your own in your bundler.
- TypeScript. Every function is typed and the typings are bundled with the package.
- Native API. Uses
Date
andIntl
under the hood. - Russian locale only. And it has docs in Russian.
Rationale
When we started to develop our projects, we picked the most popular date library that existed back then. We had used only two methods it provided, but got all the bundled ones, with all the possible locales.
OK, we set up our bundler configs to remove those locales, but still that library was the biggest that we used, but the profit wasn't so huge. We decided to look around for the date library that we need, but all of them had a lot of features that we didn't want to use.
So we replaced it with small and lightweight functions that just worked. Step by step those functions have evolved into Chronos—simple yet useful date manipulation library that works in every our project.
Table of Contents
- Getting Started
- Types
- Functions
- addMinutes
- addHours
- addDays
- addMonths
- addCalendarMonths
- addYears
- subtractMinutes
- subtractHours
- subtractDays
- subtractMonths
- subtractCalendarMonths
- subtractYears
- formatDate
- formatTimeString
- getMinutes
- getHours
- getDay
- getMonth
- getYear
- getWeekdayName
- getMonthName
- getDuration
- isSameMinute
- isSameHour
- isSameDay
- isSameMonth
- isSameYear
- getDiffInMinutes
- getDiffInHours
- getDiffInDays
- getDiffInCalendarDays
- getDiffInMonths
- getDiffInCalendarMonths
- getDiffInYears
- getDiffInCalendarYears
- getStartOfMinutes
- getStartOfHours
- getStartOfDay
- getStartOfWeek
- getStartOfMonth
- getStartOfYear
- getStartOfDecade
- getEndOfMinutes
- getEndOfHours
- getEndOfDay
- getEndOfWeek
- getEndOfMonth
- getEndOfYear
- getEndOfDecade
- getRelativeDate
- getUtcOffset
- getUnixTimestamp
- getTimezoneName
- isTimeValid
- parseDate
- Credits
Getting Started
Add the package into deps:
npm install --save @funboxteam/chronos
Import functions:
import { addYears } from '@funboxteam/chronos';
Types
The library exports several types that may be used elsewhere, but the most important that they used inside the lib to guarantee type safety.
ChronosDate
declare type ChronosDate = Date | number | string;
Every function that accepts date as a first param expects to get an instance of Date
, or a timestamp as number or string.
The timestamp may be present as seconds or milliseconds (e.g. 1596803254000
and 1596803254
is the same value).
Duration
declare type Duration = {
days: number;
hours: number;
minutes: number;
seconds: number;
};
Type describing return value of functions that work with time intervals.
Functions
Every function is immutable and those which accept Date
instances and return Date
instance always return
new Date
instance and do not mutate the passed one.
addMinutes, addHours, addDays, addMonths, addCalendarMonths, addYears
(value: ChronosDate, quantity: number) => Date;
Params
value
, date value;quantity
, number of units to add.
Example
addDays(new Date('2020-01-01T00:00:00.000Z'), 1); // 2020-01-02T00:00:00.000Z
// 1577836800 is 2020-01-01T00:00:00.000Z
addYears(1577836800, 1); // 2021-01-01T00:00:00.000Z
addMonths(new Date(2020, 0, 1), 1); // == new Date(2020, 1, 1);
addMonths(new Date(2020, 0, 31), 1); // == new Date(2020, 2, 2);
addCalendarMonths(new Date(2020, 0, 1), 1); // == new Date(2020, 1, 1);
addCalendarMonths(new Date(2020, 0, 31), 1); // == new Date(2020, 1, 29);
subtractMinutes, subtractHours, subtractDays, subtractMonths, subtractCalendarMonths, subtractYears
(value: ChronosDate, quantity: number) => Date;
Params
value
, date value;quantity
, number of units to subtract.
Example
subtractDays(new Date('2020-01-01T00:00:00.000Z'), 1); // 2019-12-31T00:00:00.000Z
// 1577836800 is 2020-01-01T00:00:00.000Z
subtractYears(1577836800, 1); // 2019-01-01T00:00:00.000Z
subtractMonths(new Date(2020, 0, 1), 1); // == new Date(2019, 11, 1);
subtractMonths(new Date(2020, 2, 31), 1); // == new Date(2020, 2, 2);
subtractCalendarMonths(new Date(2020, 0, 1), 1); // == new Date(2019, 11, 1);
subtractCalendarMonths(new Date(2020, 2, 31), 1); // == new Date(2020, 1, 29);
formatDate
(value: ChronosDate, format: string) => string;
Params
value
, date value;format
, desired format.
Available format tokens
| Type | Token | Value |
|:----------------|:-------|:------------------------------------------------|
| Second | ss
| 00, 01, 02, ..., 57, 58, 59 |
| Minute | mm
| 00, 01, 02, ..., 57, 58, 59 |
| Hour | HH
| 00, 01, 02, ..., 21, 22, 23 |
| Day of Week | dddd
| понедельник, вторник, ..., суббота, воскресенье |
| Day of Month | DD
| 01, 02, 03, ..., 29, 30, 31 |
| | D
| 1, 2, 3, ..., 29, 30, 31 |
| Month | MMMM
| январь, февраль, ..., ноябрь, декабрь |
| | MMM
| янв, фев, ..., ноя, дек |
| | MM
| 01, 02, 03, ..., 10, 11, 12 |
| Year | YYYY
| Full year, e.g.: 1885, 1955, 1985, 2015 |
| | YY
| 00, 01, 02, ..., 97, 98, 99 |
| UTC time offset | ZZ
| -1200, -1100, ..., +1300, +1400 |
| | Z
| -12:00, -11:00, ..., +13:00, +14:00 |
Example
formatDate(new Date(2020, 0, 1), 'YYYY-MM-DDTHH:mm:ssZ'); // '2020-01-01T00:00:00+03:00' (for GMT+3)
// 1577836800 is 2020-01-01T00:00:00.000Z
formatDate(1577836800, 'HH:mm:ss'); // '03:00:00' (for GMT+3)
Important notes
Only Russian locale is supported for now!
formatTimeString
(value: string, valueFormat: string, format: string) => string;
Params
value
, time string;valueFormat
, template describingvalue
format;format
, desired format.
Available format tokens
| Type | Token | Value |
|:-------|:------|:----------------------------|
| Second | ss
| 00, 01, 02, ..., 57, 58, 59 |
| Minute | mm
| 00, 01, 02, ..., 57, 58, 59 |
| Hour | HH
| 00, 01, 02, ..., 21, 22, 23 |
| | H
| 0, 1, 2, ..., 21, 22, 23 |
Example
formatTimeString('22:00', 'HH:mm', 'HH:mm:ss'); // '22:00:00'
getMinutes, getHours, getDay, getMonth, getYear
(value: ChronosDate) => number;
Params
value
, date value.
Example
getDay(new Date(2020, 0, 1)); // 1;
// 1577836800 is 2020-01-01T00:00:00.000Z
getYear(1577836800); // 2020
getWeekdayName, getMonthName
(value: ChronosDate, format?: string) => string;
Params
value
, date value;format
, format of the returned string.'long'
(by default) or'short'
.
Example
getWeekdayName(new Date(2020, 11, 30)); // 'среда' (11th month in JS is December)
getWeekdayName(new Date(2020, 11, 30), 'short'); // 'ср'
getMonthName(new Date(2020, 0, 1)); // 'январь'
getMonthName(new Date(2020, 0, 1), 'short'); // 'янв'
getDuration
(seconds: number) => Duration;
Params
seconds
, interval value in seconds.
Example
getDuration(1000000); // { days: 11, hours: 13, minutes: 46, seconds: 40 }
isSameMinute, isSameHour, isSameDay, isSameMonth, isSameYear
(firstValue: ChronosDate, secondValue: ChronosDate) => boolean;
Params
firstValue
, date value;secondValue
, date value.
Example
// 1577750400 is 2019-12-31T00:00:00.000Z
// 1577836800 is 2020-01-01T00:00:00.000Z
isSameYear(1577750400, 1577836800); // false
getDiffInMinutes, getDiffInHours, getDiffInDays, getDiffInCalendarDays, getDiffInMonths, getDiffInCalendarMonths, getDiffInYears, getDiffInCalendarYears
(firstValue: ChronosDate, secondValue: ChronosDate) => number;
Params
firstValue
, date value;secondValue
, date value.
Example
// 1577750400 is 2019-12-31T00:00:00.000Z
// 1577836800 is 2020-01-01T00:00:00.000Z
getDiffInDays(1577750400, 1577836800); // -1
getStartOfMinutes, getStartOfHours, getStartOfDay, getStartOfWeek, getStartOfMonth, getStartOfYear, getStartOfDecade
(value: ChronosDate, diff?: number) => Date;
Params
value
, date value;diff
, number of units to add to the result date.0
by default.
Example
// 1577836800 is 2020-01-01T00:00:00.000Z
getStartOfDay(1577836800); // 2019-12-31T21:00:00.000Z (for GMT+3)
getStartOfDay(1577836800, 1); // 2020-01-01T21:00:00.000Z (for GMT+3)
getStartOfDay(1577836800, -1); // 2019-12-30T21:00:00.000Z (for GMT+3)
getEndOfMinutes, getEndOfHours, getEndOfDay, getEndOfWeek, getEndOfMonth, getEndOfYear, getEndOfDecade
(value: ChronosDate, diff?: number) => Date;
Params
value
, date value;diff
, number of units to add to the result date.0
by default.
Example
// 1577836800 is 2020-01-01T00:00:00.000Z
getEndOfDay(1577836800); // 2020-01-01T20:59:59.999Z (for GMT+3)
getEndOfDay(1577836800, 1); // 2020-01-02T20:59:59.999Z (for GMT+3)
getEndOfDay(1577836800, -1); // 2019-12-31T20:59:59.999Z (for GMT+3)
getRelativeDate
(value: ChronosDate) => string;
Params
value
, date value.
Example
getRelativeDate(1577081613); // '2 месяца' (for 07.02.2020)
getRelativeDate(new Date()); // 'меньше минуты'
getUtcOffset
(value: ChronosDate) => number;
Params
value
, date value.
Example
getUtcOffset(new Date(2020, 0, 1)); // 3 (for GMT+3)
getUnixTimestamp
(date?: Date) => number;
Params
date
, Date instance.new Date()
by default.
Example
// now is 2020-02-07T08:26:59.422Z
getUnixTimestamp(); // 1581064019 (unix timestamp for new Date())
getUnixTimestamp(new Date(2020, 0, 1)); // 1577826000 (for GMT+3)
getTimezoneName
() => string;
Example
getTimezoneName(); // 'Europe/Moscow' (for any GMT+3 timezone in IE11 and for MSK in modern browsers)
Important notes
In case of lack of Intl API support returns nearest to the user timezone which has integer hours offset.
isTimeValid
(value: string, format: string) => boolean;
Params
value
, time string;format
, format string that should be used for validation.
Example
isTimeValid('22:30', 'HH:mm'); // true
parseDate
(value: string, format: string) => Date;
Params
value
, date string;format
, format string that should be used for parsing.
Available format tokens
| Type | Token | Recognized values |
|:-------------|:-------|:----------------------------------------|
| Day of Month | DD
| 01, 02, 03, ..., 29, 30, 31 |
| | D
| 1, 2, 3, ..., 29, 30, 31 |
| Month | MM
| 01, 02, 03, ..., 10, 11, 12 |
| Year | YYYY
| Full year, e.g.: 1885, 1955, 1985, 2015 |
| | YY
| 00, 01, 02, ..., 97, 98, 99 |
Example
parseDate('2000-01-21', 'YYYY-MM-DD'); // == new Date(2000, 0, 21)
parseDate('2020-01-01T00:00:00+03:00'); // == new Date(2020, 0, 1) (for GMT+3)
Important notes
If format
is not passed it tries to parse value
using native
Date.parse
. It should support ISO 8601 and RFC 2822. Other formats
are not recommended to parse without explicit format
set.
Credits
Project's pictures were made by Igor Garybaldi.