diff --git a/src/include/ttail.h b/src/include/ttail.h
index 590919e..77f0665 100644
--- a/src/include/ttail.h
+++ b/src/include/ttail.h
@@ -21,10 +21,21 @@ typedef struct _ttail_s ttail_t;
 #define TTAIL_FLAG_DATE_MIN 2
 #define TTAIL_FLAG_DATE_MAX 4
 #define TTAIL_FLAG_FORMAT 8
-#define TTAIL_DEFAULT_FORMATS {"%m", "%A %B %d, %Y %H:%M:%S", "%A", "%B", \
-"%m/%d/%y %I %p", "%d,%m,%Y %H:%M", "at %A the %dst of %B in %Y",\
-"run job at %I %p,%B %dnd", "%A den %d. %B %Y %H.%M Uhr",\
-"%c", "%y/%m/%d", "%Y/%m/%d", "%y-%m-%d", "%Y/%m/%d:%H:%M",NULL}
+#define TTAIL_DEFAULT_FORMATS {"%m",\
+"%A %B %d, %Y %H:%M:%S",\
+"%A",\
+"%B%n%d %H:%M:%S",\
+"%B%n%d %H:%M",\
+"%m/%d/%y %I %p",\
+"%d,%m,%Y %H:%M",\
+"at %A the %dst of %B in %Y",\
+"run job at %I %p,%B %dnd",\
+"%A den %d. %B %Y %H.%M Uhr",\
+"%c",\
+"%y/%m/%d",\
+"%Y/%m/%d",\
+"%y-%m-%d",\
+"%Y/%m/%d:%H:%M",NULL}
 
 struct _ttail_s
 {
diff --git a/src/include/ttail_search_files.h b/src/include/ttail_search_files.h
index 58d1724..919feab 100644
--- a/src/include/ttail_search_files.h
+++ b/src/include/ttail_search_files.h
@@ -71,6 +71,14 @@ int _ttail_search_file_sorted(ttail_t*);
  */
 int _ttail_file_reopen(ttail_t*, size_t);
 
+/**@brief Set min & max date of file
+ *@param ttail_t* ttail
+ *@param size_t id file id in ttail
+ *@param struct tm[2] will be set to min & max
+ *@return 0 on success 1 if no date found or no fp -1 if error
+ */
+int _ttail_file_minmax(ttail_t*, size_t, struct tm[2]);
+
 /**@brief Search next line
  *
  *Set f pos to next line begining and return the position
diff --git a/src/ttail_search_files.c b/src/ttail_search_files.c
index e781e17..c9120ae 100644
--- a/src/ttail_search_files.c
+++ b/src/ttail_search_files.c
@@ -112,9 +112,78 @@ int _ttail_search_closest_files_set_fsizes(ttail_t* t)
 
 int _ttail_search_file_sorted(ttail_t* t)
 {
+	/* files start & stop log tm, file start id = i*2 file stop = i*2+1 */
+	struct tm *ftm; 
+
+	ftm = malloc(sizeof(struct tm)*t->logfile_sz*2);
+	if(!ftm)
+	{
+		perror("Unable to allocate memory");
+		return -1;
+	}
+
+	free(ftm);
 	return -1;
 }
 
+int _ttail_file_minmax(ttail_t* t, size_t id, struct tm tm[2])
+{
+	FILE *fp;
+	long cur;
+	memset(tm, 0, sizeof(struct tm)*2);
+	fp = t->logfile[id];
+	if(!fp)
+	{
+		return 1;
+	}
+	if(!fseek(fp, 0, SEEK_SET))
+	{
+		perror("Unable to manipulate fp");
+		return -1;
+	}
+	while(1)
+	{
+		if(ttail_getline(t, id) < 0)
+		{
+			return 1;
+		}
+		if(!ttail_logline2date(t, ttail_getline_buf(t), tm))
+		{
+			break;
+		}
+	}
+	if(!fseek(fp, -1, SEEK_END))
+	{
+		perror("Unable to manipulate fp");
+		return -1;
+	}
+	while(1)
+	{
+		if((cur = _ttail_file_start_line(fp)) < 0)
+		{
+			return -1;
+		}
+		if(ttail_getline(t, id) < 0)
+		{
+			return 1;
+		}
+		if(!ttail_logline2date(t, ttail_getline_buf(t), tm+1))
+		{
+			break;
+		}
+		if(!cur)
+		{
+			return 1;
+		}
+		if(!fseek(fp, cur-1, SEEK_SET))
+		{
+			perror("Unable to manipulate fp");
+			return -1;
+		}
+	}
+	return 0;
+}
+
 int _ttail_file_reopen(ttail_t* t, size_t id)
 {
 	if(t->logfile[id])
diff --git a/tests/ttail_init_check.c b/tests/ttail_init_check.c
index a14220a..71e3707 100644
--- a/tests/ttail_init_check.c
+++ b/tests/ttail_init_check.c
@@ -244,6 +244,26 @@ START_TEST (test_init_guess_datetime)
 }
 END_TEST
 
+START_TEST (test_init_guess_datetime2)
+{
+	int ret;
+	struct tm tm;
+	char res[] = "%B%n%d %H:%M:%S";
+	ret = ttail_format_guess(ttail, "Mar  6 00:01:39 pilgrim dhclient", &tm);
+	ck_assert_int_ne(ret, -1);
+	ck_assert_str_eq(fmt[ret], res);
+	ck_assert(ttail->fmt != NULL);
+	ck_assert_str_eq(ttail->fmt, res);
+	ck_assert((ttail->flag & TTAIL_FLAG_FORMAT) == TTAIL_FLAG_FORMAT);
+	ck_assert_int_eq(tm.tm_year, 0);
+	ck_assert_int_eq(tm.tm_mon, 2);
+	ck_assert_int_eq(tm.tm_mday, 6);
+	ck_assert_int_eq(tm.tm_hour, 0);
+	ck_assert_int_eq(tm.tm_min, 1);
+	ck_assert_int_eq(tm.tm_sec, 39);
+}
+END_TEST
+
 START_TEST (test_init_guess_noguess)
 {
 	int ret;
@@ -290,7 +310,7 @@ START_TEST (test_init_guess_fmt_set)
 	int ret;
 	char res[] = "%Y/%m/%d";
 	ret = ttail_format_guess(ttail, "1988/10/22", NULL);
-	ck_assert_int_eq(ret, 11);
+	ck_assert_str_eq(fmt[ret], res);
 	ret = ttail_format_guess(ttail, "1988/10/22", NULL);
 	ck_assert_int_eq(ret, -2);
 	ck_assert_str_eq(ttail->fmt, res);
@@ -500,6 +520,7 @@ Suite * ttail_init_suite(void)
 		setup_ttail_empty, teardown_ttail);
 	tcase_add_test(tc_init_fmt_guess, test_init_guess_date);
 	tcase_add_test(tc_init_fmt_guess, test_init_guess_datetime);
+	tcase_add_test(tc_init_fmt_guess, test_init_guess_datetime2);
 	tcase_add_test(tc_init_fmt_guess, test_init_guess_noguess);
 	tcase_add_test(tc_init_fmt_guess, test_init_guess_date_notm);
 	tcase_add_test(tc_init_fmt_guess, test_init_guess_noguess_notm);
diff --git a/tests/ttail_search_check.c b/tests/ttail_search_check.c
index 139a23d..0669c3f 100644
--- a/tests/ttail_search_check.c
+++ b/tests/ttail_search_check.c
@@ -146,10 +146,26 @@ START_TEST (test_file_line_start)
 }
 END_TEST
 
+START_TEST (test_file_minmax1)
+{
+	int r;
+	struct tm tm[2];
+	printf("%d\n", ttail->logfile_sz);
+	ttail->flag |= TTAIL_FLAG_FORMAT;
+	//ttail->fmt = "%b%n%d %H:%M";
+	r = _ttail_search_closest_files_init(ttail);
+	ck_assert_int_eq(r, 0);
+	/*
+	r = _ttail_file_minmax(ttail, 0, tm);
+	*/
+}
+END_TEST
+
 Suite * ttail_search_suite(void)
 {
 	Suite *s;
-	TCase *tc_search_closest_fileinit, *tc_file_line;
+	TCase *tc_search_closest_fileinit, *tc_file_line,
+		*tc_file_minmax;
 
 	s = suite_create("ttail search checks");
 	tc_search_closest_fileinit = tcase_create("\
@@ -168,8 +184,14 @@ ttail_logline_closest_files_init() checks");
 	tcase_add_test(tc_file_line, test_file_line_next);
 	tcase_add_test(tc_file_line, test_file_line_start);
 
+	tc_file_minmax = tcase_create("ttail_file_minmax() checks");
+	tcase_add_checked_fixture(tc_file_minmax,
+		setup_closest_fileinit, teardown_closest_fileinit);
+	tcase_add_test(tc_file_minmax, test_file_minmax1);
+
 	suite_add_tcase(s, tc_search_closest_fileinit);
 	suite_add_tcase(s, tc_file_line);
+	suite_add_tcase(s, tc_file_minmax);
 	return s;
 }