diff --git a/CHANGES.md b/CHANGES.md
index a471a58..123d6fc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,7 @@ Changes in PDFio
 v1.5.0 - YYYY-MM-DD
 -------------------
 
+- Added `pdfioFileGetModDate()` API (Issue #88)
 - Added support for using libpng to embed PNG images in PDF output (Issue #90)
 - Updated the pdf2txt example to support font encodings.
 
diff --git a/doc/pdfio.3 b/doc/pdfio.3
index 1c823a1..837f56c 100644
--- a/doc/pdfio.3
+++ b/doc/pdfio.3
@@ -1,4 +1,4 @@
-.TH pdfio 3 "pdf read/write library" "2025-01-24" "pdf read/write library"
+.TH pdfio 3 "pdf read/write library" "2025-02-13" "pdf read/write library"
 .SH NAME
 pdfio \- pdf read/write library
 .SH Introduction
@@ -3880,6 +3880,14 @@ const char * pdfioFileGetKeywords (
     pdfio_file_t *pdf
 );
 .fi
+.SS pdfioFileGetModificationDate
+Get the most recent modification date for a PDF file.
+.PP
+.nf
+time_t  pdfioFileGetModificationDate (
+    pdfio_file_t *pdf
+);
+.fi
 .SS pdfioFileGetName
 Get a PDF's filename.
 .PP
@@ -4027,6 +4035,15 @@ void pdfioFileSetKeywords (
     const char *value
 );
 .fi
+.SS pdfioFileSetModificationDate
+Set the modification date for a PDF file.
+.PP
+.nf
+void pdfioFileSetModificationDate (
+    pdfio_file_t *pdf,
+    time_t value
+);
+.fi
 .SS pdfioFileSetPermissions
 Set the PDF permissions, encryption mode, and passwords.
 .PP
diff --git a/doc/pdfio.html b/doc/pdfio.html
index d80f62c..c3bc4c4 100644
--- a/doc/pdfio.html
+++ b/doc/pdfio.html
@@ -1,13 +1,13 @@
 <!DOCTYPE html>
 <html lang="en-US">
 <head>
-<title>PDFio Programming Manual v1.4.1</title>
+<title>PDFio Programming Manual v1.5.0</title>
 <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
 <meta name="generator" content="codedoc v3.8">
 <meta name="author" content="Michael R Sweet">
 <meta name="language" content="en-US">
 <meta name="copyright" content="Copyright © 2021-2025 by Michael R Sweet">
-<meta name="version" content="1.4.1">
+<meta name="version" content="1.5.0">
 <style type="text/css"><!--
 body {
   background: white;
@@ -251,7 +251,7 @@ span.string {
 <body>
 <div class="header">
 <p><img class="title" src="pdfio-512.png"></p>
-<h1 class="title">PDFio Programming Manual v1.4.1</h1>
+<h1 class="title">PDFio Programming Manual v1.5.0</h1>
 <p>Michael R Sweet</p>
 <p>Copyright © 2021-2025 by Michael R Sweet</p>
 </div>
@@ -417,6 +417,7 @@ span.string {
 <li><a href="#pdfioFileGetCreator">pdfioFileGetCreator</a></li>
 <li><a href="#pdfioFileGetID">pdfioFileGetID</a></li>
 <li><a href="#pdfioFileGetKeywords">pdfioFileGetKeywords</a></li>
+<li><a href="#pdfioFileGetModificationDate">pdfioFileGetModificationDate</a></li>
 <li><a href="#pdfioFileGetName">pdfioFileGetName</a></li>
 <li><a href="#pdfioFileGetNumObjs">pdfioFileGetNumObjs</a></li>
 <li><a href="#pdfioFileGetNumPages">pdfioFileGetNumPages</a></li>
@@ -432,6 +433,7 @@ span.string {
 <li><a href="#pdfioFileSetCreationDate">pdfioFileSetCreationDate</a></li>
 <li><a href="#pdfioFileSetCreator">pdfioFileSetCreator</a></li>
 <li><a href="#pdfioFileSetKeywords">pdfioFileSetKeywords</a></li>
+<li><a href="#pdfioFileSetModificationDate">pdfioFileSetModificationDate</a></li>
 <li><a href="#pdfioFileSetPermissions">pdfioFileSetPermissions</a></li>
 <li><a href="#pdfioFileSetSubject">pdfioFileSetSubject</a></li>
 <li><a href="#pdfioFileSetTitle">pdfioFileSetTitle</a></li>
@@ -4223,6 +4225,17 @@ time_t pdfioFileGetCreationDate(<a href="#pdfio_file_t">pdfio_file_t</a> *pdf);<
 </tbody></table>
 <h4 class="returnvalue">Return Value</h4>
 <p class="description">Keywords string or <code>NULL</code> for none</p>
+<h3 class="function"><a id="pdfioFileGetModificationDate">pdfioFileGetModificationDate</a></h3>
+<p class="description">Get the most recent modification date for a PDF file.</p>
+<p class="code">
+time_t pdfioFileGetModificationDate(<a href="#pdfio_file_t">pdfio_file_t</a> *pdf);</p>
+<h4 class="parameters">Parameters</h4>
+<table class="list"><tbody>
+<tr><th>pdf</th>
+<td class="description">PDF file</td></tr>
+</tbody></table>
+<h4 class="returnvalue">Return Value</h4>
+<p class="description">Modification date or <code>0</code> for none</p>
 <h3 class="function"><a id="pdfioFileGetName">pdfioFileGetName</a></h3>
 <p class="description">Get a PDF's filename.</p>
 <p class="code">
@@ -4418,6 +4431,17 @@ writes error messages to <code>stderr</code>.</p>
 <tr><th>value</th>
 <td class="description">Value</td></tr>
 </tbody></table>
+<h3 class="function"><a id="pdfioFileSetModificationDate">pdfioFileSetModificationDate</a></h3>
+<p class="description">Set the modification date for a PDF file.</p>
+<p class="code">
+<span class="reserved">void</span> pdfioFileSetModificationDate(<a href="#pdfio_file_t">pdfio_file_t</a> *pdf, time_t value);</p>
+<h4 class="parameters">Parameters</h4>
+<table class="list"><tbody>
+<tr><th>pdf</th>
+<td class="description">PDF file</td></tr>
+<tr><th>value</th>
+<td class="description">Value</td></tr>
+</tbody></table>
 <h3 class="function"><a id="pdfioFileSetPermissions">pdfioFileSetPermissions</a></h3>
 <p class="description">Set the PDF permissions, encryption mode, and passwords.</p>
 <p class="code">
diff --git a/pdfio-file.c b/pdfio-file.c
index 9d8fe0d..c0fcf06 100644
--- a/pdfio-file.c
+++ b/pdfio-file.c
@@ -802,11 +802,11 @@ pdfioFileGetKeywords(pdfio_file_t *pdf)	// I - PDF file
 
 
 //
-// 'pdfioFileGetModDate()' - Get the most recent modification date for a PDF file.
+// 'pdfioFileGetModificationDate()' - Get the most recent modification date for a PDF file.
 //
 
 time_t					// O - Modification date or `0` for none
-pdfioFileGetModDate(
+pdfioFileGetModificationDate(
     pdfio_file_t *pdf)			// I - PDF file
 {
   return (pdf && pdf->info_obj ? pdfioDictGetDate(pdfioObjGetDict(pdf->info_obj), "ModDate") : 0);
@@ -1138,6 +1138,20 @@ pdfioFileSetKeywords(
 }
 
 
+//
+// 'pdfioFileSetModificationDate()' - Set the modification date for a PDF file.
+//
+
+void
+pdfioFileSetModificationDate(
+    pdfio_file_t *pdf,			// I - PDF file
+    time_t       value)			// I - Value
+{
+  if (pdf && pdf->info_obj)
+    pdfioDictSetDate(pdf->info_obj->value.value.dict, "ModDate", value);
+}
+
+
 //
 // 'pdfioFileSetPermissions()' - Set the PDF permissions, encryption mode, and passwords.
 //
diff --git a/pdfio.h b/pdfio.h
index b48c5e9..7cb7287 100644
--- a/pdfio.h
+++ b/pdfio.h
@@ -201,7 +201,7 @@ extern time_t		pdfioFileGetCreationDate(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern const char	*pdfioFileGetCreator(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern pdfio_array_t	*pdfioFileGetID(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern const char	*pdfioFileGetKeywords(pdfio_file_t *pdf) _PDFIO_PUBLIC;
-extern time_t		pdfioFileGetModDate(pdfio_file_t *pdf) _PDFIO_PUBLIC;
+extern time_t		pdfioFileGetModificationDate(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern const char	*pdfioFileGetName(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern size_t		pdfioFileGetNumObjs(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern size_t		pdfioFileGetNumPages(pdfio_file_t *pdf) _PDFIO_PUBLIC;
@@ -217,6 +217,7 @@ extern void		pdfioFileSetAuthor(pdfio_file_t *pdf, const char *value) _PDFIO_PUB
 extern void		pdfioFileSetCreationDate(pdfio_file_t *pdf, time_t value) _PDFIO_PUBLIC;
 extern void		pdfioFileSetCreator(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
 extern void		pdfioFileSetKeywords(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
+extern void		pdfioFileSetModificationDate(pdfio_file_t *pdf, time_t value) _PDFIO_PUBLIC;
 extern bool		pdfioFileSetPermissions(pdfio_file_t *pdf, pdfio_permission_t permissions, pdfio_encryption_t encryption, const char *owner_password, const char *user_password) _PDFIO_PUBLIC;
 extern void		pdfioFileSetSubject(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
 extern void		pdfioFileSetTitle(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
diff --git a/pdfio1.def b/pdfio1.def
index b8864dc..6636250 100644
--- a/pdfio1.def
+++ b/pdfio1.def
@@ -1,73 +1,19 @@
 LIBRARY pdfio1
-VERSION 1.4
+VERSION 1.5
 EXPORTS
-_pdfioArrayDebug
-_pdfioArrayDecrypt
-_pdfioArrayDelete
-_pdfioArrayGetValue
-_pdfioArrayRead
-_pdfioArrayWrite
 _pdfioCryptoAESDecrypt
 _pdfioCryptoAESEncrypt
 _pdfioCryptoAESInit
-_pdfioCryptoLock
 _pdfioCryptoMD5Append
 _pdfioCryptoMD5Finish
 _pdfioCryptoMD5Init
-_pdfioCryptoMakeRandom
-_pdfioCryptoMakeReader
-_pdfioCryptoMakeWriter
 _pdfioCryptoRC4Crypt
 _pdfioCryptoRC4Init
 _pdfioCryptoSHA256Append
 _pdfioCryptoSHA256Finish
 _pdfioCryptoSHA256Init
-_pdfioCryptoUnlock
-_pdfioDictDebug
-_pdfioDictDecrypt
-_pdfioDictDelete
-_pdfioDictGetValue
-_pdfioDictRead
-_pdfioDictSetValue
-_pdfioDictWrite
-_pdfioFileAddMappedObj
-_pdfioFileAddPage
-_pdfioFileConsume
-_pdfioFileCreateObj
-_pdfioFileDefaultError
-_pdfioFileError
-_pdfioFileFindMappedObj
-_pdfioFileFlush
-_pdfioFileGetChar
-_pdfioFileGets
-_pdfioFilePeek
-_pdfioFilePrintf
-_pdfioFilePuts
-_pdfioFileRead
-_pdfioFileSeek
-_pdfioFileTell
-_pdfioFileWrite
-_pdfioObjDelete
-_pdfioObjGetExtension
-_pdfioObjLoad
-_pdfioObjSetExtension
-_pdfioStreamCreate
-_pdfioStreamOpen
-_pdfioStringIsAllocated
-_pdfioTokenClear
-_pdfioTokenFlush
-_pdfioTokenGet
-_pdfioTokenInit
-_pdfioTokenPush
-_pdfioTokenRead
-_pdfioValueCopy
 _pdfioValueDebug
-_pdfioValueDecrypt
-_pdfioValueDelete
 _pdfioValueRead
-_pdfioValueWrite
-_pdfio_strtod
-_pdfio_vsnprintf
 pdfioArrayAppendArray
 pdfioArrayAppendBinary
 pdfioArrayAppendBoolean
@@ -204,7 +150,7 @@ pdfioFileGetCreationDate
 pdfioFileGetCreator
 pdfioFileGetID
 pdfioFileGetKeywords
-pdfioFileGetModDate
+pdfioFileGetModificationDate
 pdfioFileGetName
 pdfioFileGetNumObjs
 pdfioFileGetNumPages
@@ -220,6 +166,7 @@ pdfioFileSetAuthor
 pdfioFileSetCreationDate
 pdfioFileSetCreator
 pdfioFileSetKeywords
+pdfioFileSetModificationDate
 pdfioFileSetPermissions
 pdfioFileSetSubject
 pdfioFileSetTitle
