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95 Workday - tidy up time calculation to make it more readable

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This commit is contained in:
Steve Bosman
2022-01-31 00:14:03 +00:00
parent a28a0adafa
commit cd35451992
1 changed files with 72 additions and 73 deletions
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143
95_Weekday/javascript/weekday.js
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@@ -3,51 +3,40 @@
// Converted from BASIC to Javascript by Oscar Toledo G. (nanochess) // Converted from BASIC to Javascript by Oscar Toledo G. (nanochess)
// //
function print(str) function print(str) {
{
document.getElementById("output").appendChild(document.createTextNode(str)); document.getElementById("output").appendChild(document.createTextNode(str));
} }
function input() function input() {
{
return new Promise(function (resolve) { return new Promise(function (resolve) {
const input_element = document.createElement("INPUT"); const input_element = document.createElement("INPUT");
print("? "); print("? ");
input_element.setAttribute("type", "text"); input_element.setAttribute("type", "text");
input_element.setAttribute("length", "50"); input_element.setAttribute("length", "50");
document.getElementById("output").appendChild(input_element); document.getElementById("output").appendChild(input_element);
input_element.focus(); input_element.focus();
input_element.addEventListener("keydown", function (event) { input_element.addEventListener("keydown", function (event) {
if (event.keyCode === 13) { if (event.keyCode === 13) {
const input_str = input_element.value; const input_str = input_element.value;
document.getElementById("output").removeChild(input_element); document.getElementById("output").removeChild(input_element);
print(input_str); print(input_str);
print("\n"); print("\n");
resolve(input_str); resolve(input_str);
} }
}); });
}); });
} }
function tab(space) function tab(space) {
{
let str = ""; let str = "";
while (space-- > 0) while (space-- > 0)
str += " "; str += " ";
return str; return str;
} }
function fna(arg) {
return Math.floor(arg / 4);
}
function fnb(arg) {
return Math.floor(arg / 7);
}
// in a non-leap year the day of the week for the first of each month moves by the following amounts. // in a non-leap year the day of the week for the first of each month moves by the following amounts.
const MONTHLY_DAY_OF_WEEK_OFFSETS = [0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5]; const COMMON_YEAR_MONTH_OFFSET = [0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5];
/** /**
* Reads a date, and extracts the date information. * Reads a date, and extracts the date information.
@@ -67,11 +56,11 @@ async function readDateElements() {
* Returns a US formatted date, i.e. Month/Day/Year. * Returns a US formatted date, i.e. Month/Day/Year.
* @param year * @param year
* @param month * @param month
* @param dayOfMonth * @param day
* @returns {string} * @returns {string}
*/ */
function getFormattedDate(year, month, dayOfMonth) { function getFormattedDate(year, month, day) {
return month + "/" + dayOfMonth + "/" + year; return month + "/" + day + "/" + year;
} }
/** /**
@@ -81,8 +70,7 @@ function getFormattedDate(year, month, dayOfMonth) {
* @param dayCount * @param dayCount
* @returns {{years: number, months: number, days: number}} * @returns {{years: number, months: number, days: number}}
*/ */
function time_spent(factor, dayCount) function time_spent(factor, dayCount) {
{
let totalDays = Math.floor(factor * dayCount); let totalDays = Math.floor(factor * dayCount);
const years = Math.floor(totalDays / 365); const years = Math.floor(totalDays / 365);
totalDays -= years * 365; totalDays -= years * 365;
@@ -120,30 +108,30 @@ function adjustUnaccountedTime(unaccountedTime, timeToRemove) {
} }
} }
function getDayOfWeek(dobYear, dobMonth, dobDayOfMonth) { function isLeapYear(year) {
const i1 = Math.floor((dobYear - 1500) / 100); if ((year % 4) !== 0) {
let a = i1 * 5 + (i1 + 3) / 4; return false;
const i2 = Math.floor(a - fnb(a) * 7); } else if ((year % 100) !== 0) {
const y2 = Math.floor(dobYear / 100); return true;
const y3 = Math.floor(dobYear - y2 * 100); } else if ((year % 400) !== 0) {
a = y3 / 4 + y3 + dobDayOfMonth + MONTHLY_DAY_OF_WEEK_OFFSETS[dobMonth-1] + i2; return false;
let dayOfWeek = Math.floor(a - fnb(a) * 7) + 1;
if (dobMonth <= 2) {
if (y3 !== 0) {
t1 = Math.floor(dobYear - fna(dobYear) * 4);
} else {
a = i1 - 1;
t1 = Math.floor(a - fna(a) * 4);
}
if (t1 === 0) {
if (dayOfWeek === 0) {
dayOfWeek = 6;
}
dayOfWeek--;
}
} }
if (dayOfWeek === 0) { return true;
dayOfWeek = 7; }
function getDayOfWeek(year, month, day) {
const centuriesSince1500 = Math.floor((year - 1500) / 100);
let centuryOffset = centuriesSince1500 * 5 + (centuriesSince1500 + 3) / 4;
centuryOffset = Math.floor(centuryOffset % 7);
// January 1st moves forward by approximately 1.25 days per year
const yearInCentury = year % 100;
const yearInCenturyOffsets = yearInCentury / 4 + yearInCentury;
const a = yearInCenturyOffsets + day + COMMON_YEAR_MONTH_OFFSET[month-1] + centuryOffset;
let dayOfWeek = Math.floor(a % 7) + 1;
if (month <= 2 && isLeapYear(year)) {
dayOfWeek--;
} }
return dayOfWeek; return dayOfWeek;
} }
@@ -151,18 +139,17 @@ function getDayOfWeek(dobYear, dobMonth, dobDayOfMonth) {
/** /**
* The following performs a special hash on the day parts which guarantees * The following performs a special hash on the day parts which guarantees
* that different days will return different numbers, and the numbers returned are in ordered. * that different days will return different numbers, and the numbers returned are in ordered.
* @param todayYear * @param year
* @param todayMonth * @param month
* @param todayDayOfMonth * @param day
* @returns {*} * @returns {*}
*/ */
function getNormalisedDay(todayYear, todayMonth, todayDayOfMonth) { function getNormalisedDay(year, month, day) {
return (todayYear * 12 + todayMonth) * 31 + todayDayOfMonth; return (year * 12 + month) * 31 + day;
} }
// Main control section // Main control section
async function main() async function main() {
{
print(tab(32) + "WEEKDAY\n"); print(tab(32) + "WEEKDAY\n");
print(tab(15) + "CREATIVE COMPUTING MORRISTOWN, NEW JERSEY\n"); print(tab(15) + "CREATIVE COMPUTING MORRISTOWN, NEW JERSEY\n");
print("\n"); print("\n");
@@ -197,11 +184,21 @@ async function main()
print(getFormattedDate(dobYear, dobMonth, dobDayOfMonth) + " WAS A "); print(getFormattedDate(dobYear, dobMonth, dobDayOfMonth) + " WAS A ");
} }
switch (dayOfWeek) { switch (dayOfWeek) {
case 1: print("SUNDAY.\n"); break; case 1:
case 2: print("MONDAY.\n"); break; print("SUNDAY.\n");
case 3: print("TUESDAY.\n"); break; break;
case 4: print("WEDNESDAY.\n"); break; case 2:
case 5: print("THURSDAY.\n"); break; print("MONDAY.\n");
break;
case 3:
print("TUESDAY.\n");
break;
case 4:
print("WEDNESDAY.\n");
break;
case 5:
print("THURSDAY.\n");
break;
case 6: case 6:
if (dobDayOfMonth === 13) { if (dobDayOfMonth === 13) {
print("FRIDAY THE THIRTEENTH---BEWARE!\n"); print("FRIDAY THE THIRTEENTH---BEWARE!\n");
@@ -209,7 +206,9 @@ async function main()
print("FRIDAY.\n"); print("FRIDAY.\n");
} }
break; break;
case 7: print("SATURDAY.\n"); break; case 7:
print("SATURDAY.\n");
break;
} }
if (normalisedToday !== normalisedDob) { if (normalisedToday !== normalisedDob) {
let yearsBetweenDates = todayYear - dobYear; let yearsBetweenDates = todayYear - dobYear;