diff --git a/src/Makefile.am b/src/Makefile.am
index aff3db8..45cba3c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,12 +4,13 @@ AM_CPPFLAGS = \
 	-DPACKAGE_LOCALE_DIR=\""$(localedir)"\" \
 	-DPACKAGE_SRC_DIR=\""$(srcdir)"\" \
 	-DPACKAGE_DATA_DIR=\""$(pkgdatadir)"\" \
-	-DCNFPATH=\""$(prefix)/etc"\"
+	-DCNFPATH=\""$(prefix)/etc"\" \
+	-I $(srcdir)
 
 AM_CFLAGS = -Wall -g
 
 bin_PROGRAMS = exifdate
 
-exifdate_SOURCES = exifdate.c
+exifdate_SOURCES = dtex.c exifdate.c
 
 exifdate_LDADD = $(LIBS) $(LIBEXIF_LIBS)
diff --git a/src/dtex.c b/src/dtex.c
new file mode 100644
index 0000000..b7226c8
--- /dev/null
+++ b/src/dtex.c
@@ -0,0 +1,81 @@
+/*
+ * EXIF date tool
+ *
+ * (c) Alexander Vdolainen 2023 <alex@vapaa.xyz>
+ *
+ * this is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * this is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <string.h>
+#include <time.h>
+#include <utime.h>
+
+time_t exifdt_tm(const char *dtbuf)
+{
+  struct tm tddt;
+  char buf[5], *b = (char *)dtbuf;
+
+  if(!dtbuf) return (time_t) -1;
+  if(strlen(dtbuf) < 18) return (time_t) -1;
+
+  memset(&tddt, 0, sizeof(struct tm));
+  /* year */
+  memset(buf, 0, 5);
+  strncpy(buf, dtbuf, 4);
+  tddt.tm_year = atoi(buf) - 1900;
+  /* month */
+  memset(buf, 0, 5);
+  b = strchr(b, ':');
+  if(!b) return (time_t) -1;
+  else b++;
+  strncpy(buf, b, 2);
+  tddt.tm_mon = atoi(buf) - 1;
+  /* day */
+  memset(buf, 0, 5);
+  b = strchr(b, ':');
+  if(!b) return (time_t) -1;
+  else b++;
+  strncpy(buf, b, 2);
+  tddt.tm_mday = atoi(buf);
+  /* hour */
+  memset(buf, 0, 5);
+  b = strchr(b, ' ');
+  if(!b) return (time_t) -1;
+  else b++;
+  strncpy(buf, b, 2);
+  tddt.tm_hour = atoi(buf);
+  /* minute */
+  memset(buf, 0, 5);
+  b = strchr(b, ':');
+  if(!b) return (time_t) -1;
+  else b++;
+  strncpy(buf, b, 2);
+  tddt.tm_min = atoi(buf);
+  /* second */
+  memset(buf, 0, 5);
+  b = strchr(b, ':');
+  if(!b) return (time_t) -1;
+  else b++;
+  strncpy(buf, b, 2);
+  tddt.tm_sec = atoi(buf);
+
+  return mktime(&tddt);
+}
diff --git a/src/exifdate.c b/src/exifdate.c
index cdf5518..b5f0990 100644
--- a/src/exifdate.c
+++ b/src/exifdate.c
@@ -30,7 +30,7 @@
 
 #include <libexif/exif-data.h>
 
-#include "../config.h"
+#include <config.h>
 
 #ifndef TOOL_FULLNAME
 #define TOOL_FULLNAME  "Jpeg EXIF data date tool"
@@ -61,57 +61,7 @@ static void display_help(FILE *o, const char *exec_name)
   return;
 }
 
-static time_t exifdt_tm(const char *dtbuf)
-{
-  struct tm tddt;
-  char buf[5], *b = (char *)dtbuf;
-
-  if(!dtbuf) return (time_t) -1;
-  if(strlen(dtbuf) < 18) return (time_t) -1;
-
-  memset(&tddt, 0, sizeof(struct tm));
-  /* year */
-  memset(buf, 0, 5);
-  strncpy(buf, dtbuf, 4);
-  tddt.tm_year = atoi(buf) - 1900;
-  /* month */
-  memset(buf, 0, 5);
-  b = strchr(b, ':');
-  if(!b) return (time_t) -1;
-  else b++;
-  strncpy(buf, b, 2);
-  tddt.tm_mon = atoi(buf) - 1;
-  /* day */
-  memset(buf, 0, 5);
-  b = strchr(b, ':');
-  if(!b) return (time_t) -1;
-  else b++;
-  strncpy(buf, b, 2);
-  tddt.tm_mday = atoi(buf);
-  /* hour */
-  memset(buf, 0, 5);
-  b = strchr(b, ' ');
-  if(!b) return (time_t) -1;
-  else b++;
-  strncpy(buf, b, 2);
-  tddt.tm_hour = atoi(buf);
-  /* minute */
-  memset(buf, 0, 5);
-  b = strchr(b, ':');
-  if(!b) return (time_t) -1;
-  else b++;
-  strncpy(buf, b, 2);
-  tddt.tm_min = atoi(buf);
-  /* second */
-  memset(buf, 0, 5);
-  b = strchr(b, ':');
-  if(!b) return (time_t) -1;
-  else b++;
-  strncpy(buf, b, 2);
-  tddt.tm_sec = atoi(buf);
-
-  return mktime(&tddt);
-}
+extern time_t exifdt_tm(const char *);
 
 int main(int argc, char **argv)
 {