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Handle DATE() parameters the same as excel does. #52

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Handle DATE() parameters the same as excel does. #52

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4 changes: 3 additions & 1 deletion lib/date-time.js
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Original file line number Diff line number Diff line change
Expand Up @@ -70,9 +70,11 @@ exports.DATE = function(year, month, day) {
if (utils.anyIsError(year, month, day)) {
return error.value;
}
if (year < 0 || month < 0 || day < 0) {
if (year < 0 || year > 9999) {
return error.num;
}
if (year < 1900)
year += 1900;
var date = new Date(year, month - 1, day);
return date;
};
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42 changes: 34 additions & 8 deletions test/date-time.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,14 +4,40 @@ var dateTime = require('../lib/date-time');
require('should');

suite('Date & Time', function() {
test('DATE', function() {
var date = dateTime.DATE(1900, 1, 1);
date.getFullYear().should.equal(1900);
date.getMonth().should.equal(1 - 1);
date.getDay().should.equal(1);

dateTime.DATE(1900, 1, -1).should.equal(error.num);
dateTime.DATE('invalid').should.equal(error.value);
suite('DATE', function (){
test('returns Date for year, month, day', function(){
var date = dateTime.DATE(1900, 1, 1);
date.getFullYear().should.equal(1900);
date.getMonth().should.equal(1 - 1);
date.getDay().should.equal(1);
});
test('uses year as is for 1900 to 9999', function() {
dateTime.DATE(1900, 2, 2).getFullYear().should.equal(1900);
dateTime.DATE(9999, 2, 2).getFullYear().should.equal(9999);
});
test('adds 1900 to year for 0 to 1899', function() {
dateTime.DATE(0, 2, 2).getFullYear().should.equal(1900);
dateTime.DATE(1899, 2, 2).getFullYear().should.equal(3799);
});
test('returns num error for year <0 or >9999', function() {
dateTime.DATE(-1, 2, 2).should.equal(error.num);
dateTime.DATE(10000, 2, 2).should.equal(error.num);
});
test('adds months >12', function() {
dateTime.DATE(2008, 14, 2).should.eql(new Date(2009, 1, 2));
});
test('subtracts months <0', function() {
dateTime.DATE(2008, -3, 2).should.eql(new Date(2007, 8, 2));
});
test('adds days > month has', function() {
dateTime.DATE(2008, 1, 35).should.eql(new Date(2008, 1, 4));
});
test('subtracts days <0', function() {
dateTime.DATE(2008, 1, -15).should.eql(new Date(2007, 11, 16));
});
test('returns value error for string', function(){
dateTime.DATE('invalid').should.equal(error.value);
});
});

test('DATEVALUE', function() {
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