Updated historic delta-T values from http://astro.ukho.gov.uk/nao/lvm/ (

#11) * Updated historic delta-T values from http://astro.ukho.gov.uk/nao/lvm/ (replacing data from maia.usno.navy.mil and https://stjarnhimlen.se/comp/time.html). * Added predicted delta-T for start of 2022. * Updated rough predictive future delta-T calculations.
kshetline · Apr 28, 2021 · f24f7ec · f24f7ec
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diff --git a/README.md b/README.md
@@ -931,7 +931,7 @@ Note that this only works for defined leap seconds. `new DateTime('2021-04-15 23
 * From TAI, Julian date, or modified Julian date values. For example:<br>
 `new DateTime('1972-07-01T00:00:10 TAI', 'UTC').toString()` →
 `"DateTime<1972-06-30T23:59:60.000 +00:00>"`<br>
-`new DateTime({ jde: 2450630.500724913 }, 'UTC').toIsoString(19)` →
+`new DateTime({ jde: 2450630.5007242477 }, 'UTC').toIsoString(19)` →
 `"1997-06-30T23:59:60"`<br><br>
 * By add/subtract operations using TAI quantities:
 `new DateTime('2016-12-31 18:59:59 EST').add('seconds_tai', 1).toString()` →
@@ -1286,6 +1286,7 @@ addDaysToDate(deltaDays: number, yearOrDate: YearOrDate, month?: number, day?: n
 
 ```typescript
   static OS_ZONE: Timezone; // Local timezone as derived from analyzing values returned by JavaScript `Date`.
+  static TAI_ZONE: Timezone; // International Atomic Time (TAI).
   static UT_ZONE: Timezone; // Universal Coordinated Time (AKA UTC, UCT, GMT, Zulu Time, etc.)
   static ZONELESS: Timezone; // A pseudo timezone for abstract date/time instances.
   static DATELESS: Timezone; // A pseudo timezone for abstract dateless, time-only `DateTime` instances.

diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@tubular/time",
-  "version": "2.6.2",
-  "description": "Date/time, IANA timezones, calendar with settable Julian/Gregorian switchover",
+  "version": "2.6.4",
+  "description": "Date/time, IANA timezones, leap seconds, TAI/UTC conversions, calendar with settable Julian/Gregorian switchover",
   "browser": "dist/web/index.js",
   "browser-es5": "dist/web5/index.js",
   "main": "dist/es6/index.js",
@@ -19,6 +19,7 @@
     "document": "typedoc --name \"ks-date-time-zone\" --module commonjs --exclude \"**/*+(e2e|spec|index).ts\" --excludePrivate --excludeProtected --readme README.md --target ES5 --out docs src"
   },
   "keywords": [
+    "astronomy",
     "calendar",
     "date",
     "gregorian",
@@ -27,6 +28,7 @@
     "leap second",
     "moment",
     "olson",
+    "tdt",
     "tai",
     "time",
     "time zone",
@@ -44,9 +46,9 @@
     "@babel/core": "^7.13.16",
     "@babel/preset-env": "^7.13.15",
     "@babel/register": "^7.13.16",
-    "@types/chai": "^4.2.16",
+    "@types/chai": "^4.2.17",
     "@types/mocha": "^8.2.2",
-    "@types/node": "^14.14.41",
+    "@types/node": "^14.14.43",
     "@typescript-eslint/eslint-plugin": "^4.22.0",
     "@typescript-eslint/parser": "^4.22.0",
     "babel-loader": "^8.2.2",
@@ -65,7 +67,7 @@
     "terser-webpack-plugin": "^4.2.3",
     "ts-node": "^9.1.1",
     "typescript": "^4.2.4",
-    "webpack": "^5.35.1",
+    "webpack": "^5.36.0",
     "webpack-cli": "^4.6.0",
     "webpack-node-externals": "^2.5.2"
   },

diff --git a/src/date-time.spec.ts b/src/date-time.spec.ts
@@ -542,8 +542,8 @@ describe('DateTime', () => {
     expect(new DateTime('1995-12-31 23:59:60Z').compare(new DateTime('1995-12-31 23:59:59Z'))).to.be.greaterThan(0);
     expect(new DateTime('1996-12-31 23:59:60Z').toString()).to.equal('DateTime<1997-01-01T00:00:00.000 +00:00>');
     expect(new DateTime('1972-06-30 23:59:60Z', 'TAI').toString()).to.equal('DateTime<1972-07-01T00:00:10.000 TAI>');
-    expect(new DateTime('1997-06-30 23:59:60Z').wallTime.jde).to.be.closeTo(2450630.500724913, 1E-9);
-    expect(new DateTime({ jde: 2450630.500724913 }, 'utc').toIsoString(19)).to.equal('1997-06-30T23:59:60');
+    expect(new DateTime('1997-06-30 23:59:60Z').wallTime.jde).to.be.closeTo(2450630.5007242477, 1E-9);
+    expect(new DateTime({ jde: 2450630.5007242477 }, 'utc').toIsoString(19)).to.equal('1997-06-30T23:59:60');
 
     expect(ttime.sort([new DateTime('1995-12-31 23:59:60Z'), new DateTime('1995-12-31 23:59:59Z')])
       .map(dt => dt.format(ttime.DATETIME_LOCAL_SECONDS)).join()).to.equal('1995-12-31T23:59:59,1995-12-31T23:59:60');
@@ -581,7 +581,7 @@ describe('DateTime', () => {
   });
 
   it('should correctly handle TDT/UT/TAI conversions', () => {
-    expect(new DateTime('1945-05-08Z').deltaTaiMillis).to.be.closeTo(-5249, 2);
+    expect(new DateTime('1945-05-08Z').deltaTaiMillis).to.be.closeTo(-4965, 2);
 
     expect(new DateTime('1995-12-31 23:59:59Z').add('second_tai', 1).toString()).to.equal('DateTime<1995-12-31T23:59:60.000 +00:00>');
     expect(new DateTime('1995-12-31 23:59:00Z').add(DateTimeField.MINUTE_TAI, 1).toString()).to.equal('DateTime<1995-12-31T23:59:60.000 +00:00>');

diff --git a/src/timezone-large-alt.ts b/src/timezone-large-alt.ts
@@ -3,7 +3,7 @@
 const timezoneLargeAlt = /* trim-file-start */{ // tz database version: 2021a, years 1800-2088, rounded to nearest minute, filtered, calendar rollbacks eliminated
   version: '2021a',
   years: '1800-2088',
-  deltaTs: '69.36 69.36',
+  deltaTs: '69.36 69.36 69.45',
   leapSeconds: '912 1096 1461 1826 2191 2557 2922 3287 3652 4199 4564 4929 5660 6574 7305 7670 8217 8582 8947 9496 10043 10592 13149 14245 15522 16617 17167',
   'Africa/Abidjan': '-0016 +0000 0;-g/0/LMT 0/0/GMT;1;-2ldXI;;48e5;BFCIGMGNMLMRSHSLSNTG',
   'Africa/Accra': '-0001 +0000 0;-1/0/LMT 0/0/GMT k/k u/0 u/u;1212121212121212121212121212121212121212121212131414141414141;-2bRzX 9RbX fdE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE Mok 1BXE M0k 1BXE fak 9vbu bjCu MLu 1Bcu MLu 1BAu MLu 1Bcu MLu 1Bcu MLu 1Bcu MLu;;41e5;GH',

diff --git a/src/timezone-large.ts b/src/timezone-large.ts
@@ -3,7 +3,7 @@
 const timezoneLarge = /* trim-file-start */{ // tz database version: 2021a, years 1800-2088
   version: '2021a',
   years: '1800-2088',
-  deltaTs: '69.36 69.36',
+  deltaTs: '69.36 69.36 69.45',
   leapSeconds: '912 1096 1461 1826 2191 2557 2922 3287 3652 4199 4564 4929 5660 6574 7305 7670 8217 8582 8947 9496 10043 10592 13149 14245 15522 16617 17167',
   'Africa/Abidjan': '-001608 +0000 0;-g.8/0/LMT 0/0/GMT;1;-2ldXH.Q;;48e5;BFCIGMGNMLMRSHSLSNTG',
   'Africa/Accra': '-000052 +0000 0;-0.Q/0/LMT 0/0/GMT k/k u/0 u/u;1212121212121212121212121212121212121212121212131414141414141;-2bRzX.8 9RbX.8 fdE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE 1BAk MLE 1Bck MLE 1Bck MLE 1Bck MLE Mok 1BXE M0k 1BXE fak 9vbu bjCu MLu 1Bcu MLu 1BAu MLu 1Bcu MLu 1Bcu MLu 1Bcu MLu;;41e5;GH',

diff --git a/src/timezone-small.ts b/src/timezone-small.ts
@@ -3,7 +3,7 @@
 const timezoneSmall = /* trim-file-start */{ // tz database version: 2021a, years 2016-2026
   version: '2021a',
   years: '2016-2026',
-  deltaTs: '69.36 69.36',
+  deltaTs: '69.36 69.36 69.45',
   leapSeconds: '912 1096 1461 1826 2191 2557 2922 3287 3652 4199 4564 4929 5660 6574 7305 7670 8217 8582 8947 9496 10043 10592 13149 14245 15522 16617 17167',
   'Africa/Abidjan': '+0000 +0000 0;0/0/GMT;;;;48e5;BFCIGMGNMLMRSHSLSNTG',
   'Africa/Algiers': '+0100 +0100 0;10/0/CET;;;;26e5;DZ',

diff --git a/src/ut-converter.spec.ts b/src/ut-converter.spec.ts
@@ -7,16 +7,17 @@ import { round } from '@tubular/math';
 
 const SIX_MONTHS_DAYS = 180;
 const TEST_DTS = [
-  22.51, 23.01, 23.46, 23.63, 23.95, 24.39, 24.34, 24.1, 24.02, 23.98,
-  23.89, 23.93, 23.88, 23.91, 23.76, 23.91, 23.96, 24.04, 24.35, 24.82,
-  25.3, 25.77, 26.27, 26.76, 27.27, 27.77, 28.25, 28.7, 29.15, 29.57,
-  29.97, 30.36, 30.72, 31.07, 31.35, 31.68, 32.17, 32.67, 33.15, 33.58,
-  33.99, 34.47, 35.03, 35.74, 36.55, 37.43, 38.29, 39.2, 40.18, 41.17,
-  42.23, 43.37, 44.48, 45.48, 46.46, 47.52, 48.53, 49.59, 50.54, 51.38,
-  52.17, 52.96, 53.79, 54.34, 54.87, 55.32, 55.82, 56.3, 56.86, 57.57,
-  58.31, 59.12, 59.98, 60.79, 61.63, 62.3, 62.97, 63.47, 63.83, 64.09,
-  64.3, 64.47, 64.57, 64.69, 64.85, 65.15, 65.46, 65.78, 66.07, 66.32,
-  66.6, 66.91, 67.28, 67.64, 68.1, 68.59, 68.97, 69.22, 69.36, 69.36
+  22.69, 23.12, 23.49, 23.79, 24.02, 24.20, 24.32, 24.39, 24.42, 24.41,
+  24.38, 24.32, 24.25, 24.16, 24.08, 24.04, 24.06, 24.17, 24.43, 24.83,
+  25.35, 25.92, 26.51, 27.05, 27.51, 27.89, 28.24, 28.58, 28.93, 29.32,
+  29.70, 30.00, 30.20, 30.41, 30.76, 31.34, 32.03, 32.65, 33.07, 33.36,
+  33.62, 33.96, 34.44, 35.09, 35.95, 36.93, 37.96, 38.95, 39.93, 40.95,
+  42.04, 43.15, 44.24, 45.28, 46.28, 47.29, 48.33, 49.37, 50.36, 51.28,
+  52.13, 52.94, 53.70, 54.39, 54.98, 55.46, 55.89, 56.37, 56.99, 57.70,
+  58.45, 59.19, 59.92, 60.68, 61.46, 62.23, 62.90, 63.42, 63.81, 64.08,
+  64.27, 64.41, 64.55, 64.73, 64.95, 65.20, 65.48, 65.77, 66.06, 66.33,
+  66.61, 66.92, 67.28, 67.69, 68.11, 68.53, 68.92, 69.24, 69.36, 69.36,
+  69.45
 ];
 
 describe('UT/TDT Converter', () => {
@@ -32,7 +33,7 @@ describe('UT/TDT Converter', () => {
       expect(taiToUtMillis(utToTaiMillis(millis, true), true)).to.equal(millis);
     }
 
-    for (let y = 1922; y <= 2021; ++y) {
+    for (let y = 1922; y <= 2022; ++y) {
       const now = new DateTime([y], 'UTC');
       const epochMillis = now.epochMillis;
       const deltaTai = round(now.wallTime.deltaTai * 1000);