Date-Day Calendar

At one time I had a DOS program which enabled me to find the day of the week for any date from year 1800 or so onwards (and indeed into the future). Can anyone suggest a similar Windows program available nowadays?

Yeah :p double click on the clock in your taskbar

D=prompt('Date as MM/DD/YYYY','');
D1=D.split('/');
DayNames=new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
Now=new Date(D1[2],D1[0]-1,D1[1]);
Now_D=Now.getDay();
alert(DayNames[Now_D]);

Originally posted by Nightfire
Yeah :p double click on the clock in your taskbar

This only starts from 1980. I need to go back to 1800.

ahh, so it does :)

Originally posted by jalarie
D=prompt('Date as MM/DD/YYYY','');
D1=D.split('/');
DayNames=new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
Now=new Date(D1[2],D1[0]-1,D1[1]);
Now_D=Now.getDay();
alert(DayNames[Now_D]);

Does this work for the 19th century taking account of leap years etc?

Thanks, Jalerie. Much obliged.

First tests suggests that this works fine even for 19th century.

<script LANGUAGE="JavaScript">
<!-- Begin
var D = "0";
var M = "0";
var Y = "0";
var C = "0";
var B = "0";
var A = "0";
var Day = "0";
var Ending = "0";
var Dayow = new Array();
Dayow[-6] = "Monday";
Dayow[-5] = "Tuesday";
Dayow[-4] = "Wednesday";
Dayow[-3] = "Thursday";
Dayow[-2] = "Friday";
Dayow[-1] = "Saturday";
Dayow[0] = "Sunday";
Dayow[1] = "Monday";
Dayow[2] = "Tuesday";
Dayow[3] = "Wednesday";
Dayow[4] = "Thursday";
Dayow[5] = "Friday";
Dayow[6] = "Saturday";
var mnth = new Array();
mnth[0] = "January";
mnth[1] = "February";
mnth[2] = "March";
mnth[3] = "April";
mnth[4] = "May";
mnth[5] = "June";
mnth[6] = "July";
mnth[7] = "August";
mnth[8] = "September";
mnth[9] = "October";
mnth[10] = "November";
mnth[11] = "December";
function calcul() {
if (document.calculate.mnth.options.value == 0 || document.calculate.day.options.value == 0 || document.calculate.year.value.length == 0) {
alert('Please complete all options');
}
else if (document.calculate.mnth.options.value == 2 && document.calculate.day.options.value == 30 || document.calculate.mnth.options.value == 2 && document.calculate.day.options.value == 31) {
alert('That Month does not have '+ document.calculate.day.options.value +' days');
}
else if (document.calculate.mnth.options.value == 4 && document.calculate.day.options.value == 31) {
alert('That month does not have '+ document.calculate.day.options.value +' days');
}
else if (document.calculate.mnth.options.value == 6 && document.calculate.day.options.value == 31) {
alert('That month does not have '+ document.calculate.day.options.value +' days');
}
else if (document.calculate.mnth.options.value == 9 && document.calculate.day.options.value == 31) {
alert('That month does not have '+ document.calculate.day.options.value +' days');
}
else if (document.calculate.mnth.options.value == 11 && document.calculate.day.options.value == 31) {
alert('That month does not have '+ document.calculate.day.options.value +' days');
}
else {
calcul2();
}
}
function calcul2() {
D = document.calculate.day.options.value;
M = document.calculate.mnth.options.value;
Y = document.calculate.year.value;
if (M < 3) {
M = ((M / 1) + 12);
Y = (Y - 1);
date2();
}
else {
date2();
}
}
function date2() {
C = (parseInt(Y / 100));
B = (Y - (100 * C));
A = ((parseInt((2.6 * M) - 5.39)) + (parseInt(B / 4)) + (parseInt(C / 4)) + (D / 1) + B - (2 * C));
Day = (A - (7 * (parseInt(A / 7))));
Leap = ((Y / 4) - (parseInt(Y / 4)));
if (Leap != 0 && M >= 3 && A < 0) {
Day =- -Day;
daycalcu();
}
else if (Leap == 0 && M < 3 && A < 0) {
Day = (Day - 2);
daycalcu();
}
else {
daycalcu();
}
}
function daycalcu() {
if (document.calculate.mnth.options.value == 2 && document.calculate.day.options.value == 29 && Leap == 0) {
alert('February does not have '+ document.calculate.day.options.value +' days in '+ document.calculate.year.value +'');
}
else {
appear();
}
}
function appear() {
if (document.calculate.day.options.value == 1 || document.calculate.day.options.value == 21 || document.calculate.day.options.value == 31) {
Ending = "st";
appear2();
}
else if (document.calculate.day.options.value == 2 || document.calculate.day.options.value == 22) {
Ending = "nd";
appear2();
}
else if (document.calculate.day.options.value == 3 || document.calculate.day.options.value == 23) {
Ending = "rd";
appear2();
}
else {
Ending ="th";
appear2();
}
}
function appear2() {
test = new Date();
gdate = test.getDate();
gyear = test.getFullYear();
gmonth = test.getMonth();
E = (gmonth + 1);
D = document.calculate.day.options.value;
M = document.calculate.mnth.options.value;
Y = document.calculate.year.value;
F = (M - 1);
if (gyear == Y && gdate == D && E == M) {
alert('The '+ document.calculate.day.options.value + Ending +' of '+ mnth[F] +' '+ document.calculate.year.value +' is a '+ Dayow[Day] +'');
}
else if (gyear < Y || gyear == Y && E < M || gyear == Y && E == M && gdate < D) {
alert('The '+ document.calculate.day.options.value + Ending +' of '+ mnth[F] +' '+ document.calculate.year.value +' will be a '+ Dayow[Day] +'');
}
else if (gyear > Y || gyear == Y && E > M || gyear == Y && E == M && gdate > D) {
alert('The '+ document.calculate.day.options.value + Ending +' of '+ mnth[F] +' '+ document.calculate.year.value +' was a '+ Dayow[Day] +'');
}
else {
alert('The '+ document.calculate.day.options.value + Ending +' of '+ mnth[F] +' '+ document.calculate.year.value +' was a '+ Dayow[Day] +'');
}
}
// End -->
</script>


<form name="calculate">
<p><select name="day" size="1">
<option>Choose Date </option>
<option value="1">1st </option>
<option value="2">2nd </option>
<option value="3">3rd </option>
<option value="4">4th </option>
<option value="5">5th </option>
<option value="6">6th </option>
<option value="7">7th </option>
<option value="8">8th </option>
<option value="9">9th </option>
<option value="10">10th </option>
<option value="11">11th </option>
<option value="12">12th </option>
<option value="13">13th </option>
<option value="14">14th </option>
<option value="15">15th </option>
<option value="16">16th </option>
<option value="17">17th </option>
<option value="18">18th </option>
<option value="19">19th </option>
<option value="20">20th </option>
<option value="21">21st </option>
<option value="22">22nd </option>
<option value="23">23rd </option>
<option value="24">24th </option>
<option value="25">25th </option>
<option value="26">26th </option>
<option value="27">27th </option>
<option value="28">28th </option>
<option value="29">29th </option>
<option value="30">30th </option>
<option value="31">31st </option>
</select> <select name="mnth" size="1">
<option>Choose Month </option>
<option value="1">January </option>
<option value="2">February </option>
<option value="3">March </option>
<option value="4">April </option>
<option value="5">May </option>
<option value="6">June </option>
<option value="7">July </option>
<option value="8">August </option>
<option value="9">September </option>
<option value="10">October </option>
<option value="11">November </option>
<option value="12">December </option>
</select> <input type="text" name="year" size="4" maxlength="4"> Year <br>
<input type="button" value="Calculate" onclick="calcul()"> </p>
</form>

Rather cool.