EOMONTH() and EDATE() Functions should round date value before evaluation

[MarkBaker]

This is:

- [X] a bug report
- [ ] a feature request
- [ ] **not** a usage question (ask them on https://stackoverflow.com/questions/tagged/phpspreadsheet or https://gitter.im/PHPOffice/PhpSpreadsheet)

What is the expected behavior?

The Excel EOMONTH() and EDATE() functions should always return a float with the date, but with the time truncated to 0.

e.g.

EOMONTH(22269.75, 3) should result in float 22371.0
EDATE(22269.75, 2) should result in float 22331.0

What is the current behavior?

If the dateValue argument to EOMONTH() includes a time, then the result also includes that time.

EOMONTH(22269.75, 3) results in float 22371.75
EDATE(22269.75, 2) results in float 22331.75

What are the steps to reproduce?

Please provide a Minimal, Complete, and Verifiable example of code that exhibits the issue without relying on an external Excel file or a web server:

<?php

require __DIR__ . '/vendor/autoload.php';

use PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel\Month;

$dateValue = 22269.75;
$adjustment = 3;
$result = Month::lastDay($dateValue, $adjustment);
var_dump($result); // Should be (float) 22371.0 but is (float) 22371.75

$dateValue = 22269.75;
$adjustment = 2;
$result = Month::adjust($dateValue, $adjustment);
var_dump($result); // Should be (float) 22331.0 but is (float) 22331.75

If this is an issue with reading a specific spreadsheet file, then it may be appropriate to provide a sample file that demonstrates the problem; but please keep it as small as possible, and sanitize any confidential information before uploading.

What features do you think are causing the issue

• Reader
• Writer
• Styles
• Data Validations
• Formula Calculations
• Charts
• AutoFilter
• Form Elements

Does an issue affect all spreadsheet file formats? If not, which formats are affected?

N/A

Which versions of PhpSpreadsheet and PHP are affected?

All