diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2aa5101eb..5544f84722 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com)
 and this project adheres to [Semantic Versioning](https://semver.org).
 
+# TBD - 2.1.10
+
+### Fixed
+
+- TEXT and TIMEVALUE functions. [Issue #4249](https://github.com/PHPOffice/PhpSpreadsheet/issues/4249) [PR #4353](https://github.com/PHPOffice/PhpSpreadsheet/pull/4353)
+
 # 2025-02-07 - 2.1.9
 
 ### Fixed
diff --git a/src/PhpSpreadsheet/Calculation/DateTimeExcel/TimeValue.php b/src/PhpSpreadsheet/Calculation/DateTimeExcel/TimeValue.php
index f744e30694..b00aba7b6a 100644
--- a/src/PhpSpreadsheet/Calculation/DateTimeExcel/TimeValue.php
+++ b/src/PhpSpreadsheet/Calculation/DateTimeExcel/TimeValue.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
 
+use Composer\Pcre\Preg;
 use Datetime;
 use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
@@ -12,6 +13,19 @@ class TimeValue
 {
     use ArrayEnabled;
 
+    private const EXTRACT_TIME = '/\b'
+        . '(\d+)' // match[1] - hour
+        . '(:' // start of match[2] (rest of string) - colon
+        . '(\d+' // start of match[3] - minute
+        . '(:\d+' // start of match[4] - colon and seconds
+        . '([.]\d+)?' // match[5] - optional decimal point followed by fractional seconds
+        . ')?' // end of match[4], which is optional
+        . ')' // end of match 3
+        // Excel does not require 'm' to trail 'a' or 'p'; Php does
+        . '(\s*(a|p))?' // match[6] optional whitespace followed by optional match[7] a or p
+        . ')' // end of match[2]
+        . '/i';
+
     /**
      * TIMEVALUE.
      *
@@ -43,17 +57,20 @@ public static function fromString(null|array|string|int|bool|float $timeValue):
         }
 
         // try to parse as time iff there is at least one digit
-        if (is_string($timeValue) && preg_match('/\\d/', $timeValue) !== 1) {
+        if (is_string($timeValue) && !Preg::isMatch('/\d/', $timeValue)) {
             return ExcelError::VALUE();
         }
 
         $timeValue = trim((string) $timeValue, '"');
-        $timeValue = str_replace(['/', '.'], '-', $timeValue);
-
-        $arraySplit = preg_split('/[\/:\-\s]/', $timeValue) ?: [];
-        if ((count($arraySplit) == 2 || count($arraySplit) == 3) && $arraySplit[0] > 24) {
-            $arraySplit[0] = ($arraySplit[0] % 24); // @phpstan-ignore-line
-            $timeValue = implode(':', $arraySplit);
+        if (Preg::isMatch(self::EXTRACT_TIME, $timeValue, $matches)) {
+            if (empty($matches[6])) { // am/pm
+                $hour = (int) $matches[1];
+                $timeValue = ($hour % 24) . $matches[2];
+            } elseif ($matches[6] === $matches[7]) { // Excel wants space before am/pm
+                return ExcelError::VALUE();
+            } else {
+                $timeValue = $matches[0] . 'm';
+            }
         }
 
         $PHPDateArray = Helpers::dateParse($timeValue);
diff --git a/src/PhpSpreadsheet/Calculation/TextData/Format.php b/src/PhpSpreadsheet/Calculation/TextData/Format.php
index 40335ced73..0f2d69f5f6 100644
--- a/src/PhpSpreadsheet/Calculation/TextData/Format.php
+++ b/src/PhpSpreadsheet/Calculation/TextData/Format.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\TextData;
 
+use Composer\Pcre\Preg;
 use DateTimeInterface;
 use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
@@ -127,11 +128,11 @@ public static function TEXTFORMAT(mixed $value, mixed $format): array|string
         $format = Helpers::extractString($format);
         $format = (string) NumberFormat::convertSystemFormats($format);
 
-        if (!is_numeric($value) && Date::isDateTimeFormatCode($format)) {
+        if (!is_numeric($value) && Date::isDateTimeFormatCode($format) && !Preg::isMatch('/^\s*\d+(\s+\d+)+\s*$/', $value)) {
             $value1 = DateTimeExcel\DateValue::fromString($value);
             $value2 = DateTimeExcel\TimeValue::fromString($value);
             /** @var float|int|string */
-            $value = (is_numeric($value1) && is_numeric($value2)) ? ($value1 + $value2) : (is_numeric($value1) ? $value2 : $value1);
+            $value = (is_numeric($value1) && is_numeric($value2)) ? ($value1 + $value2) : (is_numeric($value1) ? $value1 : (is_numeric($value2) ? $value2 : $value));
         }
 
         return (string) NumberFormat::toFormattedString($value, $format);
@@ -284,7 +285,7 @@ public static function NUMBERVALUE(mixed $value = '', mixed $decimalSeparator =
         }
 
         if (!is_numeric($value)) {
-            $decimalPositions = preg_match_all('/' . preg_quote($decimalSeparator, '/') . '/', $value, $matches, PREG_OFFSET_CAPTURE);
+            $decimalPositions = Preg::matchAllWithOffsets('/' . preg_quote($decimalSeparator, '/') . '/', $value, $matches);
             if ($decimalPositions > 1) {
                 return ExcelError::VALUE();
             }
diff --git a/tests/data/Calculation/TextData/TEXT.php b/tests/data/Calculation/TextData/TEXT.php
index bf6474a281..1eee828144 100644
--- a/tests/data/Calculation/TextData/TEXT.php
+++ b/tests/data/Calculation/TextData/TEXT.php
@@ -73,6 +73,56 @@
         '2014-02-15 16:17',
         'dd-mmm-yyyy HH:MM:SS AM/PM',
     ],
+    'datetime integer' => [
+        '1900-01-06 00:00',
+        6,
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime integer as string' => [
+        '1900-01-06 00:00',
+        '6',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime 2 integers without date delimiters' => [
+        '5 6',
+        '5 6',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime 2 integers separated by hyphen' => [
+        (new DateTimeImmutable())->format('Y') . '-05-13 00:00',
+        '5-13',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime string date only' => [
+        '1951-01-23 00:00',
+        'January 23, 1951',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime string time followed by date' => [
+        '1952-05-02 03:54',
+        '3:54 May 2, 1952',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime string date followed by time pm' => [
+        '1952-05-02 15:54',
+        'May 2, 1952 3:54 pm',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime string date followed by time p' => [
+        '1952-05-02 15:54',
+        'May 2, 1952 3:54 p',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime decimal string interpreted as time' => [
+        '1900-01-02 12:00',
+        '2.5',
+        'yyyy-mm-dd hh:mm',
+    ],
+    'datetime unparseable string' => [
+        'xyz',
+        'xyz',
+        'yyyy-mm-dd hh:mm',
+    ],
     [
         '1 3/4',
         1.75,