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<?php
namespace PhpOffice\PhpSpreadsheet\Shared;
use DateTime;
use DateTimeInterface;
use DateTimeZone;
use PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Cell\Cell;
use PhpOffice\PhpSpreadsheet\Exception;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDate;
use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
class Date
{
/** constants */
const CALENDAR_WINDOWS_1900 = 1900; // Base date of 1st Jan 1900 = 1.0
const CALENDAR_MAC_1904 = 1904; // Base date of 2nd Jan 1904 = 1.0
/**
* Names of the months of the year, indexed by shortname
* Planned usage for locale settings.
*
* @var string[]
*/
public static array $monthNames = [
'Jan' => 'January',
'Feb' => 'February',
'Mar' => 'March',
'Apr' => 'April',
'May' => 'May',
'Jun' => 'June',
'Jul' => 'July',
'Aug' => 'August',
'Sep' => 'September',
'Oct' => 'October',
'Nov' => 'November',
'Dec' => 'December',
];
/**
* @var string[]
*/
public static array $numberSuffixes = [
'st',
'nd',
'rd',
'th',
];
/**
* Base calendar year to use for calculations
* Value is either CALENDAR_WINDOWS_1900 (1900) or CALENDAR_MAC_1904 (1904).
*/
protected static int $excelCalendar = self::CALENDAR_WINDOWS_1900;
/**
* Default timezone to use for DateTime objects.
*/
protected static ?DateTimeZone $defaultTimeZone = null;
/**
* Set the Excel calendar (Windows 1900 or Mac 1904).
*
* @param int $baseYear Excel base date (1900 or 1904)
*
* @return bool Success or failure
*/
public static function setExcelCalendar(int $baseYear): bool
{
if (
($baseYear == self::CALENDAR_WINDOWS_1900)
|| ($baseYear == self::CALENDAR_MAC_1904)
) {
self::$excelCalendar = $baseYear;
return true;
}
return false;
}
/**
* Return the Excel calendar (Windows 1900 or Mac 1904).
*
* @return int Excel base date (1900 or 1904)
*/
public static function getExcelCalendar(): int
{
return self::$excelCalendar;
}
/**
* Set the Default timezone to use for dates.
*
* @param null|DateTimeZone|string $timeZone The timezone to set for all Excel datetimestamp to PHP DateTime Object conversions
*
* @return bool Success or failure
*/
public static function setDefaultTimezone($timeZone): bool
{
try {
$timeZone = self::validateTimeZone($timeZone);
self::$defaultTimeZone = $timeZone;
$retval = true;
} catch (PhpSpreadsheetException) {
$retval = false;
}
return $retval;
}
/**
* Return the Default timezone, or UTC if default not set.
*/
public static function getDefaultTimezone(): DateTimeZone
{
return self::$defaultTimeZone ?? new DateTimeZone('UTC');
}
/**
* Return the Default timezone, or local timezone if default is not set.
*/
public static function getDefaultOrLocalTimezone(): DateTimeZone
{
return self::$defaultTimeZone ?? new DateTimeZone(date_default_timezone_get());
}
/**
* Return the Default timezone even if null.
*/
public static function getDefaultTimezoneOrNull(): ?DateTimeZone
{
return self::$defaultTimeZone;
}
/**
* Validate a timezone.
*
* @param null|DateTimeZone|string $timeZone The timezone to validate, either as a timezone string or object
*
* @return ?DateTimeZone The timezone as a timezone object
*/
private static function validateTimeZone($timeZone): ?DateTimeZone
{
if ($timeZone instanceof DateTimeZone || $timeZone === null) {
return $timeZone;
}
if (in_array($timeZone, DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC))) {
return new DateTimeZone($timeZone);
}
throw new PhpSpreadsheetException('Invalid timezone');
}
/**
* @param mixed $value Converts a date/time in ISO-8601 standard format date string to an Excel
* serialized timestamp.
* See https://en.wikipedia.org/wiki/ISO_8601 for details of the ISO-8601 standard format.
*/
public static function convertIsoDate(mixed $value): float|int
{
if (!is_string($value)) {
throw new Exception('Non-string value supplied for Iso Date conversion');
}
$date = new DateTime($value);
$dateErrors = DateTime::getLastErrors();
if (is_array($dateErrors) && ($dateErrors['warning_count'] > 0 || $dateErrors['error_count'] > 0)) {
throw new Exception("Invalid string $value supplied for datatype Date");
}
$newValue = SharedDate::PHPToExcel($date);
if ($newValue === false) {
throw new Exception("Invalid string $value supplied for datatype Date");
}
if (preg_match('/^\\s*\\d?\\d:\\d\\d(:\\d\\d([.]\\d+)?)?\\s*(am|pm)?\\s*$/i', $value) == 1) {
$newValue = fmod($newValue, 1.0);
}
return $newValue;
}
/**
* Convert a MS serialized datetime value from Excel to a PHP Date/Time object.
*
* @param float|int $excelTimestamp MS Excel serialized date/time value
* @param null|DateTimeZone|string $timeZone The timezone to assume for the Excel timestamp,
* if you don't want to treat it as a UTC value
* Use the default (UTC) unless you absolutely need a conversion
*
* @return DateTime PHP date/time object
*/
public static function excelToDateTimeObject(float|int $excelTimestamp, null|DateTimeZone|string $timeZone = null): DateTime
{
$timeZone = ($timeZone === null) ? self::getDefaultTimezone() : self::validateTimeZone($timeZone);
if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_EXCEL) {
if ($excelTimestamp < 1 && self::$excelCalendar === self::CALENDAR_WINDOWS_1900) {
// Unix timestamp base date
$baseDate = new DateTime('1970-01-01', $timeZone);
} else {
// MS Excel calendar base dates
if (self::$excelCalendar == self::CALENDAR_WINDOWS_1900) {
// Allow adjustment for 1900 Leap Year in MS Excel
$baseDate = ($excelTimestamp < 60) ? new DateTime('1899-12-31', $timeZone) : new DateTime('1899-12-30', $timeZone);
} else {
$baseDate = new DateTime('1904-01-01', $timeZone);
}
}
} else {
$baseDate = new DateTime('1899-12-30', $timeZone);
}
$days = floor($excelTimestamp);
$partDay = $excelTimestamp - $days;
$hms = 86400 * $partDay;
$microseconds = (int) round(fmod($hms, 1) * 1000000);
$hms = (int) floor($hms);
$hours = intdiv($hms, 3600);
$hms -= $hours * 3600;
$minutes = intdiv($hms, 60);
$seconds = $hms % 60;
if ($days >= 0) {
$days = '+' . $days;
}
$interval = $days . ' days';
return $baseDate->modify($interval)
->setTime($hours, $minutes, $seconds, $microseconds);
}
/**
* Convert a MS serialized datetime value from Excel to a unix timestamp.
* The use of Unix timestamps, and therefore this function, is discouraged.
* They are not Y2038-safe on a 32-bit system, and have no timezone info.
*
* @param float|int $excelTimestamp MS Excel serialized date/time value
* @param null|DateTimeZone|string $timeZone The timezone to assume for the Excel timestamp,
* if you don't want to treat it as a UTC value
* Use the default (UTC) unless you absolutely need a conversion
*
* @return int Unix timetamp for this date/time
*/
public static function excelToTimestamp($excelTimestamp, $timeZone = null): int
{
$dto = self::excelToDateTimeObject($excelTimestamp, $timeZone);
self::roundMicroseconds($dto);
return (int) $dto->format('U');
}
/**
* Convert a date from PHP to an MS Excel serialized date/time value.
*
* @param mixed $dateValue PHP DateTime object or a string - Unix timestamp is also permitted, but discouraged;
* not Y2038-safe on a 32-bit system, and no timezone info
*
* @return false|float Excel date/time value
* or boolean FALSE on failure
*/
public static function PHPToExcel(mixed $dateValue)
{
if ((is_object($dateValue)) && ($dateValue instanceof DateTimeInterface)) {
return self::dateTimeToExcel($dateValue);
} elseif (is_numeric($dateValue)) {
return self::timestampToExcel($dateValue);
} elseif (is_string($dateValue)) {
return self::stringToExcel($dateValue);
}
return false;
}
/**
* Convert a PHP DateTime object to an MS Excel serialized date/time value.
*
* @param DateTimeInterface $dateValue PHP DateTime object
*
* @return float MS Excel serialized date/time value
*/
public static function dateTimeToExcel(DateTimeInterface $dateValue): float
{
$seconds = (float) sprintf('%d.%06d', $dateValue->format('s'), $dateValue->format('u'));
return self::formattedPHPToExcel(
(int) $dateValue->format('Y'),
(int) $dateValue->format('m'),
(int) $dateValue->format('d'),
(int) $dateValue->format('H'),
(int) $dateValue->format('i'),
$seconds
);
}
/**
* Convert a Unix timestamp to an MS Excel serialized date/time value.
* The use of Unix timestamps, and therefore this function, is discouraged.
* They are not Y2038-safe on a 32-bit system, and have no timezone info.
*
* @param float|int|string $unixTimestamp Unix Timestamp
*
* @return false|float MS Excel serialized date/time value
*/
public static function timestampToExcel($unixTimestamp): bool|float
{
if (!is_numeric($unixTimestamp)) {
return false;
}
return self::dateTimeToExcel(new DateTime('@' . $unixTimestamp));
}
/**
* formattedPHPToExcel.
*
* @return float Excel date/time value
*/
public static function formattedPHPToExcel(int $year, int $month, int $day, int $hours = 0, int $minutes = 0, float|int $seconds = 0): float
{
if (self::$excelCalendar == self::CALENDAR_WINDOWS_1900) {
//
// Fudge factor for the erroneous fact that the year 1900 is treated as a Leap Year in MS Excel
// This affects every date following 28th February 1900
//
$excel1900isLeapYear = true;
if (($year == 1900) && ($month <= 2)) {
$excel1900isLeapYear = false;
}
$myexcelBaseDate = 2415020;
} else {
$myexcelBaseDate = 2416481;
$excel1900isLeapYear = false;
}
// Julian base date Adjustment
if ($month > 2) {
$month -= 3;
} else {
$month += 9;
--$year;
}
// Calculate the Julian Date, then subtract the Excel base date (JD 2415020 = 31-Dec-1899 Giving Excel Date of 0)
$century = (int) substr((string) $year, 0, 2);
$decade = (int) substr((string) $year, 2, 2);
$excelDate = floor((146097 * $century) / 4) + floor((1461 * $decade) / 4) + floor((153 * $month + 2) / 5) + $day + 1721119 - $myexcelBaseDate + $excel1900isLeapYear;
$excelTime = (($hours * 3600) + ($minutes * 60) + $seconds) / 86400;
return (float) $excelDate + $excelTime;
}
/**
* Is a given cell a date/time?
*/
public static function isDateTime(Cell $cell, mixed $value = null, bool $dateWithoutTimeOkay = true): bool
{
$result = false;
$worksheet = $cell->getWorksheetOrNull();
$spreadsheet = ($worksheet === null) ? null : $worksheet->getParent();
if ($worksheet !== null && $spreadsheet !== null) {
$index = $spreadsheet->getActiveSheetIndex();
$selected = $worksheet->getSelectedCells();
try {
$result = is_numeric($value ?? $cell->getCalculatedValue())
&& self::isDateTimeFormat(
$worksheet->getStyle(
$cell->getCoordinate()
)->getNumberFormat(),
$dateWithoutTimeOkay
);
} catch (Exception) {
// Result is already false, so no need to actually do anything here
}
$worksheet->setSelectedCells($selected);
$spreadsheet->setActiveSheetIndex($index);
}
return $result;
}
/**
* Is a given NumberFormat code a date/time format code?
*/
public static function isDateTimeFormat(NumberFormat $excelFormatCode, bool $dateWithoutTimeOkay = true): bool
{
return self::isDateTimeFormatCode((string) $excelFormatCode->getFormatCode(), $dateWithoutTimeOkay);
}
private const POSSIBLE_DATETIME_FORMAT_CHARACTERS = 'eymdHs';
private const POSSIBLE_TIME_FORMAT_CHARACTERS = 'Hs'; // note - no 'm' due to ambiguity
/**
* Is a given number format code a date/time?
*/
public static function isDateTimeFormatCode(string $excelFormatCode, bool $dateWithoutTimeOkay = true): bool
{
if (strtolower($excelFormatCode) === strtolower(NumberFormat::FORMAT_GENERAL)) {
// "General" contains an epoch letter 'e', so we trap for it explicitly here (case-insensitive check)
return false;
}
if (preg_match('/[0#]E[+-]0/i', $excelFormatCode)) {
// Scientific format
return false;
}
// Switch on formatcode
$excelFormatCode = (string) NumberFormat::convertSystemFormats($excelFormatCode);
if (in_array($excelFormatCode, NumberFormat::DATE_TIME_OR_DATETIME_ARRAY, true)) {
return $dateWithoutTimeOkay || in_array($excelFormatCode, NumberFormat::TIME_OR_DATETIME_ARRAY);
}
// Typically number, currency or accounting (or occasionally fraction) formats
if ((str_starts_with($excelFormatCode, '_')) || (str_starts_with($excelFormatCode, '0 '))) {
return false;
}
// Some "special formats" provided in German Excel versions were detected as date time value,
// so filter them out here - "\C\H\-00000" (Switzerland) and "\D-00000" (Germany).
if (str_contains($excelFormatCode, '-00000')) {
return false;
}
$possibleFormatCharacters = $dateWithoutTimeOkay ? self::POSSIBLE_DATETIME_FORMAT_CHARACTERS : self::POSSIBLE_TIME_FORMAT_CHARACTERS;
// Try checking for any of the date formatting characters that don't appear within square braces
if (preg_match('/(^|\])[^\[]*[' . $possibleFormatCharacters . ']/i', $excelFormatCode)) {
// We might also have a format mask containing quoted strings...
// we don't want to test for any of our characters within the quoted blocks
if (str_contains($excelFormatCode, '"')) {
$segMatcher = false;
foreach (explode('"', $excelFormatCode) as $subVal) {
// Only test in alternate array entries (the non-quoted blocks)
$segMatcher = $segMatcher === false;
if (
$segMatcher
&& (preg_match('/(^|\])[^\[]*[' . $possibleFormatCharacters . ']/i', $subVal))
) {
return true;
}
}
return false;
}
return true;
}
// No date...
return false;
}
/**
* Convert a date/time string to Excel time.
*
* @param string $dateValue Examples: '2009-12-31', '2009-12-31 15:59', '2009-12-31 15:59:10'
*
* @return false|float Excel date/time serial value
*/
public static function stringToExcel(string $dateValue): bool|float
{
if (strlen($dateValue) < 2) {
return false;
}
if (!preg_match('/^(\d{1,4}[ \.\/\-][A-Z]{3,9}([ \.\/\-]\d{1,4})?|[A-Z]{3,9}[ \.\/\-]\d{1,4}([ \.\/\-]\d{1,4})?|\d{1,4}[ \.\/\-]\d{1,4}([ \.\/\-]\d{1,4})?)( \d{1,2}:\d{1,2}(:\d{1,2})?)?$/iu', $dateValue)) {
return false;
}
$dateValueNew = DateTimeExcel\DateValue::fromString($dateValue);
if (!is_float($dateValueNew)) {
return false;
}
if (str_contains($dateValue, ':')) {
$timeValue = DateTimeExcel\TimeValue::fromString($dateValue);
if (!is_float($timeValue)) {
return false;
}
$dateValueNew += $timeValue;
}
return $dateValueNew;
}
/**
* Converts a month name (either a long or a short name) to a month number.
*
* @param string $monthName Month name or abbreviation
*
* @return int|string Month number (1 - 12), or the original string argument if it isn't a valid month name
*/
public static function monthStringToNumber(string $monthName)
{
$monthIndex = 1;
foreach (self::$monthNames as $shortMonthName => $longMonthName) {
if (($monthName === $longMonthName) || ($monthName === $shortMonthName)) {
return $monthIndex;
}
++$monthIndex;
}
return $monthName;
}
/**
* Strips an ordinal from a numeric value.
*
* @param string $day Day number with an ordinal
*
* @return int|string The integer value with any ordinal stripped, or the original string argument if it isn't a valid numeric
*/
public static function dayStringToNumber(string $day)
{
$strippedDayValue = (str_replace(self::$numberSuffixes, '', $day));
if (is_numeric($strippedDayValue)) {
return (int) $strippedDayValue;
}
return $day;
}
public static function dateTimeFromTimestamp(string $date, ?DateTimeZone $timeZone = null): DateTime
{
$dtobj = DateTime::createFromFormat('U', $date) ?: new DateTime();
$dtobj->setTimeZone($timeZone ?? self::getDefaultOrLocalTimezone());
return $dtobj;
}
public static function formattedDateTimeFromTimestamp(string $date, string $format, ?DateTimeZone $timeZone = null): string
{
$dtobj = self::dateTimeFromTimestamp($date, $timeZone);
return $dtobj->format($format);
}
public static function roundMicroseconds(DateTime $dti): void
{
$microseconds = (int) $dti->format('u');
if ($microseconds >= 500000) {
$dti->modify('+1 second');
}
}
}
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