diff --git a/configure.ac b/configure.ac
index 8b7ccc8..3f8158d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,8 +42,8 @@ AC_SUBST([LIBPSL_VERSION_MAJOR], [$(echo $VERSION | cut -d'.' -f1)])
 AC_SUBST([LIBPSL_VERSION_MINOR], [$(echo $VERSION | cut -d'.' -f2)])
 AC_SUBST([LIBPSL_VERSION_PATCH], [$(echo $VERSION | cut -d'.' -f3)])
 AC_SUBST([LIBPSL_VERSION_NUMBER], [$(printf '0x%02x%02x%02x' $LIBPSL_VERSION_MAJOR $LIBPSL_VERSION_MINOR $LIBPSL_VERSION_PATCH)])
-AC_SUBST([COPYRIGHT_MONTH], [$(date +%B)])
-AC_SUBST([COPYRIGHT_YEAR], [$(date +%Y)])
+AC_SUBST([COPYRIGHT_MONTH], [m4_esyscmd([LC_ALL=C date -u -d "@$SOURCE_DATE_EPOCH" +%B 2>/dev/null || LC_ALL=C date -u -r "$SOURCE_DATE_EPOCH" +%B 2>/dev/null || LC_ALL=C date -u +%B])])
+AC_SUBST([COPYRIGHT_YEAR], [m4_esyscmd([LC_ALL=Cdate -u -d "@$SOURCE_DATE_EPOCH" +%Y 2>/dev/null || LC_ALL=C date -u -r "$SOURCE_DATE_EPOCH" +%Y 2>/dev/null || LC_ALL=C date -u +%Y])])
 AC_CONFIG_FILES([include/libpsl.h tools/psl.1])
 
 dnl
diff --git a/meson.build b/meson.build
index 1e46d06..06c36c6 100644
--- a/meson.build
+++ b/meson.build
@@ -157,7 +157,16 @@ endif
 # Shared configuration data for copyright date and version
 _cdata = configuration_data()
 _cdata.set('PACKAGE_VERSION', meson.project_version())
-copyright_date = run_command(['date', '+%B %Y'], check: true).stdout().strip()
+date_exe = find_program('date')
+epoch_cmd = run_command('sh', '-c', 'LC_ALL=C echo "${SOURCE_DATE_EPOCH:-$(date +%s)}"', check: true)
+source_date_epoch = epoch_cmd.stdout().strip()
+copyright_cmd = run_command('sh', '-c',
+  'date -u -d "@' + source_date_epoch + '" "+%B %Y" 2>/dev/null || ' +
+  'date -u -r "' + source_date_epoch + '" "+%B %Y" 2>/dev/null || ' +
+  'date -u "+%B %Y"',
+  check: true
+)
+copyright_date = copyright_cmd.stdout().strip()
 _cdata.set('COPYRIGHT_MONTH', copyright_date.split()[0])
 _cdata.set('COPYRIGHT_YEAR', copyright_date.split()[1])