From 04fc7c4bea9b4efa38a7398b6db56a8fe5273bfb Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Mon, 30 May 2022 09:00:36 -0400
Subject: Add conversions to ISO-8601 date format

---
 libqpdf/QUtil.cc | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'libqpdf')

diff --git a/libqpdf/QUtil.cc b/libqpdf/QUtil.cc
index 3e68d95e..7a5d3caf 100644
--- a/libqpdf/QUtil.cc
+++ b/libqpdf/QUtil.cc
@@ -984,6 +984,32 @@ QUtil::qpdf_time_to_pdf_time(QPDFTime const& qtm)
         QUtil::int_to_string(qtm.second, 2) + tz_offset);
 }
 
+std::string
+QUtil::qpdf_time_to_iso8601(QPDFTime const& qtm)
+{
+    std::string tz_offset;
+    int t = qtm.tz_delta;
+    if (t == 0) {
+        tz_offset = "Z";
+    } else {
+        if (t < 0) {
+            t = -t;
+            tz_offset += "+";
+        } else {
+            tz_offset += "-";
+        }
+        tz_offset += QUtil::int_to_string(t / 60, 2) + ":" +
+            QUtil::int_to_string(t % 60, 2);
+    }
+    return (
+        QUtil::int_to_string(qtm.year, 4) + "-" +
+        QUtil::int_to_string(qtm.month, 2) + "-" +
+        QUtil::int_to_string(qtm.day, 2) + "T" +
+        QUtil::int_to_string(qtm.hour, 2) + ":" +
+        QUtil::int_to_string(qtm.minute, 2) + ":" +
+        QUtil::int_to_string(qtm.second, 2) + tz_offset);
+}
+
 bool
 QUtil::pdf_time_to_qpdf_time(std::string const& str, QPDFTime* qtm)
 {
@@ -1018,6 +1044,17 @@ QUtil::pdf_time_to_qpdf_time(std::string const& str, QPDFTime* qtm)
     return true;
 }
 
+bool
+QUtil::pdf_time_to_iso8601(std::string const& pdf_time, std::string& iso8601)
+{
+    QPDFTime qtm;
+    if (pdf_time_to_qpdf_time(pdf_time, &qtm)) {
+        iso8601 = qpdf_time_to_iso8601(qtm);
+        return true;
+    }
+    return false;
+}
+
 std::string
 QUtil::toUTF8(unsigned long uval)
 {
-- 
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