diff --git a/src/common.c b/src/common.c
index 42cd5c18..c074d50a 100644
--- a/src/common.c
+++ b/src/common.c
@@ -262,3 +262,17 @@ void set_secwest(void)
 #endif
 }
 
+/**
+ * td_ntfs2utc - Convert an NTFS time to Unix time
+ * @time:  An NTFS time in 100ns units since 1601
+ *
+ * NTFS stores times as the number of 100ns intervals since January 1st 1601 at
+ * 00:00 UTC.  This system will not suffer from Y2K problems until ~57000AD.
+ *
+ * Return:  n  A Unix time (number of seconds since 1970)
+ */
+#define NTFS_TIME_OFFSET ((int64_t)(369 * 365 + 89) * 24 * 3600 * 10000000)
+time_t td_ntfs2utc (int64_t ntfstime)
+{
+  return (ntfstime - (NTFS_TIME_OFFSET)) / 10000000;
+}
diff --git a/src/common.h b/src/common.h
index 019c4abe..1de1042c 100644
--- a/src/common.h
+++ b/src/common.h
@@ -432,6 +432,7 @@ void set_part_name_chomp(partition_t *partition, const unsigned char *src, const
 char* strip_dup(char* str);
 int date_dos2unix(const unsigned short f_time,const unsigned short f_date);
 void set_secwest(void);
+time_t td_ntfs2utc (int64_t ntfstime);
 #ifndef BSD_MAXPARTITIONS
 #define	BSD_MAXPARTITIONS	8
 #endif
diff --git a/src/ntfs_dir.c b/src/ntfs_dir.c
index 34d33424..779b6df7 100644
--- a/src/ntfs_dir.c
+++ b/src/ntfs_dir.c
@@ -83,7 +83,6 @@
 #define PATH_SEP      '/'
 #define NTFS_DT_DIR               4
 #define NTFS_DT_REG             8
-#define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000)
 #ifndef FILE_first_user
 #define FILE_first_user 16
 #endif
@@ -102,7 +101,6 @@ extern struct ntfs_device_operations ntfs_device_testdisk_io_ops;
 
 extern int ntfs_readdir(ntfs_inode *dir_ni, s64 *pos,
                 void *dirent, ntfs_filldir_t filldir);
-static time_t td_ntfs2utc (s64 ntfstime);
 static int ntfs_td_list_entry(  struct ntfs_dir_struct *ls, const ntfschar *name, 
 		const int name_len, const int name_type, const s64 pos,
 		const MFT_REF mref, const unsigned dt_type);
@@ -133,20 +131,6 @@ static int index_get_size(ntfs_inode *inode)
 	return iroot->index_block_size;
 }
 
-/**
- * td_ntfs2utc - Convert an NTFS time to Unix time
- * @time:  An NTFS time in 100ns units since 1601
- *
- * NTFS stores times as the number of 100ns intervals since January 1st 1601 at
- * 00:00 UTC.  This system will not suffer from Y2K problems until ~57000AD.
- *
- * Return:  n  A Unix time (number of seconds since 1970)
- */
-static time_t td_ntfs2utc (s64 ntfstime)
-{
-  return (ntfstime - (NTFS_TIME_OFFSET)) / 10000000;
-}
-
 #ifdef HAVE_ICONV
 static int ntfs_ucstoutf8(iconv_t cd, const ntfschar *ins, int ins_len, char **outs, int outs_len)
 {
diff --git a/src/ntfs_udl.c b/src/ntfs_udl.c
index e838c53e..9f3c4ebb 100644
--- a/src/ntfs_udl.c
+++ b/src/ntfs_udl.c
@@ -166,20 +166,6 @@ struct ufile {
 	char		 padding[4];	/* Unused: padding to 64 bit. */
 };
 
-/**
- * td_ntfs2utc - Convert an NTFS time to Unix time
- * @time:  An NTFS time in 100ns units since 1601
- *
- * NTFS stores times as the number of 100ns intervals since January 1st 1601 at
- * 00:00 UTC.  This system will not suffer from Y2K problems until ~57000AD.
- *
- * Return:  n  A Unix time (number of seconds since 1970)
- */
-static time_t td_ntfs2utc (s64 ntfstime)
-{
-  return (ntfstime - (NTFS_TIME_OFFSET)) / 10000000;
-}
-
 static const char *UNKNOWN   = "unknown";
 static struct options opts;