diff --git a/ext/hook.c b/ext/hook.c
index f97d2a5..1f2af89 100644
--- a/ext/hook.c
+++ b/ext/hook.c
@@ -285,11 +285,24 @@ static inline void apply_interval(timelib_time **time, timelib_rel_time *interva
 
 static inline int is_fixed_time_str(zend_string *datetime, zval *timezone)
 {
+	zend_string *datetime_lower;
 	zval before_zv, after_zv;
 	php_date_obj *before, *after;
 	zend_class_entry *ce = php_date_get_immutable_ce();
 	bool is_fixed_time_str;
 
+	datetime_lower = zend_string_tolower(datetime);
+	if (strncmp(ZSTR_VAL(datetime_lower), "now", 3) == 0 ||
+		strncmp(ZSTR_VAL(datetime_lower), "yesterday", 9) == 0 ||
+		strncmp(ZSTR_VAL(datetime_lower), "today", 5) == 0 ||
+		strncmp(ZSTR_VAL(datetime_lower), "tomorrow", 8) == 0
+	) {
+		zend_string_release(datetime_lower);
+		return 2;
+	}
+
+	zend_string_release(datetime_lower);
+
 	php_date_instantiate(ce, &before_zv);
 	before = Z_PHPDATE_P(&before_zv);
 	if (!php_date_initialize(before, ZSTR_VAL(datetime), ZSTR_LEN(datetime), NULL, timezone, 0)) {
@@ -679,14 +692,6 @@ static void hook_strtotime(INTERNAL_FUNCTION_PARAMETERS)
 		Z_PARAM_LONG_OR_NULL(preset_ts, preset_ts_is_null);
 	ZEND_PARSE_PARAMETERS_END();
 
-	/* "now" special case */
-	times_lower = zend_string_tolower(times);
-	if (strncmp(ZSTR_VAL(times_lower), "now", 3) == 0) {
-		zend_string_release(times_lower);
-		RETURN_LONG((zend_long) get_shifted_time(NULL));
-	}
-	zend_string_release(times_lower);
-
 	is_fixed_ret = is_fixed_time_str(times, NULL);
 
 	if (!preset_ts_is_null || is_fixed_ret == 1 || is_fixed_ret == FAILURE) {
@@ -694,12 +699,16 @@ static void hook_strtotime(INTERNAL_FUNCTION_PARAMETERS)
 		return;
 	}
 
-	/* Call original function with params. */
-	zval *params = NULL;
-	uint32_t param_count = 0;
-	zend_parse_parameters(ZEND_NUM_ARGS(), "+", &params, &param_count);
-	ZVAL_LONG(&params[1], get_shifted_time(NULL));
-	CALL_ORIGINAL_FUNCTION_WITH_PARAMS(strtotime, params, param_count);
+	if (is_fixed_ret == 2) {
+		CALL_ORIGINAL_FUNCTION(strtotime);
+	} else {
+		/* Call original function with params. */
+		zval *params = NULL;
+		uint32_t param_count = 0;
+		zend_parse_parameters(ZEND_NUM_ARGS(), "+", &params, &param_count);
+		ZVAL_LONG(&params[1], get_shifted_time(NULL));
+		CALL_ORIGINAL_FUNCTION_WITH_PARAMS(strtotime, params, param_count);
+	}
 
 	/* Apply interval. */
 	timelib_time *t = timelib_time_ctor();
diff --git a/ext/tests/gh12.phpt b/ext/tests/gh12.phpt
new file mode 100644
index 0000000..3ac9f75
--- /dev/null
+++ b/ext/tests/gh12.phpt
@@ -0,0 +1,42 @@
+--TEST--
+Check GitHub PR - #12 (wrong strtotime)
+--EXTENSIONS--
+colopl_timeshifter
+--SKIPIF--
+<?php
+if (posix_getuid() !== 0) die('skip require root');
+if (! is_string(($result = shell_exec('date -s "2024-09-17 17:00:00"')))) die ('skip cannot set current date');
+try {
+    $dt = new \DateTimeImmutable($result);
+    if (!($dt instanceof \DateTimeImmutable)) {
+        throw new Exception("construction failed: {$result}");
+    }
+} catch (\Exception $e) {
+    die("skip {$e->getmessage()}");
+}
+?>
+--FILE--
+<?php
+
+\Colopl\ColoplTimeShifter\register_hook(new DateInterval('P1D'));
+
+echo (new \DateTime('@' . strtotime('now')))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+echo (new \DateTime('@' . strtotime('today')))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+echo (new \DateTime('@' . strtotime('tomorrow')))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+echo (new \DateTime('@' . strtotime('yesterday')))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+
+echo (new \DateTime('now'))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+echo (new \DateTime('today'))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+echo (new \DateTime('tomorrow'))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+echo (new \DateTime('yesterday'))->format('Y-m-d H:i:s.u'), \PHP_EOL;
+
+?>
+--EXPECTF--
+2024-09-16 17:00:00.%d
+2024-09-16 00:00:00.%d
+2024-09-17 00:00:00.%d
+2024-09-15 00:00:00.%d
+2024-09-16 17:00:00.%d
+2024-09-16 00:00:00.%d
+2024-09-17 00:00:00.%d
+2024-09-15 00:00:00.%d