removing day-js dependency

Signed-off-by: Cédric Foellmi <cedric@onekiloparsec.dev>

Author: onekiloparsec

README.md

@@ -3,9 +3,11 @@ aa-js
 
 ![build and test](https://github.com/onekiloparsec/aa-js/actions/workflows/nodejs.yml/badge.svg?branch=master) [![codecov](https://codecov.io/gh/onekiloparsec/aa-js/graph/badge.svg?token=EfRJpZ4OTu)](https://codecov.io/gh/onekiloparsec/aa-js)
 
-A fairly comprehensive collection of accurate astronomical algorithms (AA) in JavaScript (TypeScript). 
+A fairly comprehensive collection of accurate astronomical algorithms (AA) in JavaScript (TypeScript).
 It started as an implementation of AA, but it is not yet complete.
 
+`aa-js` has **zero runtime dependencies**.
+
 At the beginning, `aa-js` is the port in javascript of the C++ implementation of Astronomical
 Algorithms by J.P. Naughter, called [AA+](http://www.naughter.com/aa.html),
 based on the reference text book by Jean Meeus. It is written in TypeScript, and

package-lock.json

@@ -54,9 +54,6 @@
     "url": "https://github.com/onekiloparsec/aa-js/issues"
   },
   "homepage": "https://github.com/onekiloparsec/aa-js#readme",
-  "dependencies": {
-    "dayjs": "^1.11.19"
-  },
   "devDependencies": {
     "@vitest/coverage-v8": "^4.0.18",
     "chokidar-cli": "^3.0.0",

package.json

@@ -3,7 +3,6 @@
  *
  * @module Julian Days
  */
-import dayjs from 'dayjs'
 import { DAYMS, DEG2H, DEG2RAD, J1970, J2000, MJD_START } from './constants'
 import { ArcSecond, Degree, Hour, JulianCentury, JulianDay, JulianMillenium, Radian } from './types'
 import { transformUTC2TT } from '@/times'
@@ -35,7 +34,7 @@ export function getJulianDay (...args: any[]): JulianDay {
       return value.valueOf() / DAYMS - 0.5 + J1970
     } else if (value instanceof String || typeof value === 'string') {
       // @ts-ignore
-      return dayjs(value).toDate().valueOf() / DAYMS - 0.5 + J1970
+      return new Date(value).valueOf() / DAYMS - 0.5 + J1970
     } else if (isNumber(value)) {
       const year = Math.floor(value)
       const month = Math.floor((value - year) * 12) // the month is 0-indexed

src/juliandays.ts

@@ -1,16 +1,12 @@
 import { Hour, JulianDay } from '@/types'
-import dayjs from 'dayjs'
 import { getDate, getJulianDay } from '@/juliandays'
 import { getSexagesimalValue } from '@/sexagesimal'
 
 export function getJDatUTC (jd: JulianDay, utc: Hour): JulianDay {
-  const utcMoment = dayjs.utc(getDate(jd))
+  const d = getDate(jd)
   const sexa = getSexagesimalValue(utc)
-  return getJulianDay(
-    utcMoment
-      .hour(sexa.radix)
-      .minute(sexa.minutes)
-      .second(sexa.seconds)
-      .toDate()
-  )!
+  return getJulianDay(new Date(Date.UTC(
+    d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate(),
+    sexa.radix, sexa.minutes, sexa.seconds
+  )))!
 }

src/risetransitset/utils.ts

@@ -2,12 +2,8 @@
  * @module Utils
  */
 
-import dayjs from 'dayjs'
-import utc from 'dayjs/plugin/utc'
 import { Degree, Hour } from '@/types'
 
-dayjs.extend(utc)
-
 export function isNumber (v: any): boolean {
   return !isNaN(parseFloat(v)) && isFinite(v)
 }

src/utils.ts

@@ -34,7 +34,6 @@ export default defineConfig({
     dedupe: [
       'vue',
       'lodash',
-      'dayjs',
     ],
   },
   test: {