How to query excel system time format in php

Recently I encountered a problem that has troubled me for a long time, that is, when using PHP to query Excel tables, the system time format will appear incorrectly. This is a very common problem, but it can be troublesome to solve. After a lot of torture I finally found the solution. In this article, I will share with you my experience and solution.

First, let’s take a look at the specific manifestations of this problem. When using PHP to query Excel tables, system time format errors often occur. This is usually because dates and times in Excel tables are saved in text format rather than time format. When we use PHP to read these dates and times, the system parses them into strings instead of time format. This leads to problems such as not being able to correctly calculate the time difference between dates when doing data analysis and processing.

There are many ways to solve this problem, but the simplest and most effective way is to use the PHPExcel library. PHPExcel is a free PHP library that can be used to read and write Excel files. It has very powerful features, is able to handle various Excel formats, and is able to parse date and time formats correctly.

The following is a basic sample code using the PHPExcel library to read an Excel table and parse the date and time format:

require_once 'PHPExcel.php';

$reader = PHPExcel_IOFactory::createReader('Excel2007');

$reader->setReadDataOnly(true);

$excel = PHPExcel_IOFactory::load('test.xlsx');

$worksheet = $excel->getActiveSheet();

foreach ($worksheet->getRowIterator() as $row) {

    foreach ($row->getCellIterator() as $cell) {

        if ($cell->getDataType() == PHPExcel_Cell_DataType::TYPE_NUMERIC && PHPExcel_Shared_Date::isDateTime($cell)) {

            $value = $cell->getFormattedValue();

            $date = date('Y-m-d H:i:s', PHPExcel_Shared_Date::ExcelToPHP($value));

            echo $date;

        } else {

            echo $cell->getValue();

        }

        echo " ";

    }

    echo "\n";

}

This code uses the PHPExcel_IOFactory, PHPExcel_Shared_Date and PHPExcel_Cell_DataType classes in the PHPExcel library to Read data from Excel tables. First, we use the createReader() method in the PHPExcel_IOFactory class to create an Excel reader. Then, we set the reader's setReadDataOnly() method to true to read only the data in the Excel table without reading the format. Next, we use the load() method to load the Excel table. Finally, we use the getRowIterator() and getCellIterator() methods to iterate through the rows and columns in the Excel table. If the data type of the cell is number and it is in date and time format then use isDateTime() method in PHPExcel_Shared_Date class to validate it. If the validation passes, use the getFormattedValue() and ExcelToPHP() methods to parse the date and time format into the standard date and time format in PHP.

The key to this code is to use the PHPExcel_Shared_Date class to parse the date and time format in Excel. PHPExcel_Shared_Date is a special class in the PHPExcel library that provides some methods to help us parse date and time formats correctly, including the ExcelToPHP() and PHPToExcel() methods. The ExcelToPHP() method converts the date and time format in Excel to the standard date and time format in PHP, while the PHPToExcel() method converts the date and time format in PHP to the date and time format in Excel. These methods are very useful and essential when dealing with dates and times in Excel tables.

To summarize, when using PHP to query Excel tables, system time format errors often occur. The simplest and most efficient way to solve this problem is to use the PHPExcel library. Using PHPExcel library, we can correctly parse date and time formats in Excel tables and convert them to standard date and time formats in PHP. In this way, we can correctly calculate the time difference between dates and perform data analysis and processing. Hope this article can help you solve similar problems.

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