diff --git a/app/src/heart_wave_sample_service.c b/app/src/heart_wave_sample_service.c
index 674aae1..50743ab 100644
--- a/app/src/heart_wave_sample_service.c
+++ b/app/src/heart_wave_sample_service.c
@@ -485,14 +485,14 @@ void hwss_init(void) {
 void hwss_load(void) { ads1293_init(); }
 void hwss_unload(void) { ads1293_uninit(); }
 
-uint32_t hwss_started_has_passed_s(void) { return znrf_rtc_get_timestamp_s() - m_capture_start_s; }
+uint32_t hwss_started_has_passed_s(void) { return znordic_getpower_on_s() - m_capture_start_s; }
 
 void hwss_start_capture(void) {
   m_drop_state_triggered = false;
   m_work_flag            = true;
   m_frame_index          = 0;
   m_frame_filter_index   = 0;
-  m_capture_start_s      = znrf_rtc_get_timestamp_s();
+  m_capture_start_s      = znordic_getpower_on_s();
   pLittleBlockCache_reset();
   // ads1293_start_conversion(&m_ads1293_0);
   // ads1293_start_conversion(&m_ads1293_1);