NRF_MODEM_GNSS_PVT_FLAG_LEAP_SECOND_VALID

#define NRF_MODEM_GNSS_PVT_FLAG_LEAP_SECOND_VALID   0x02

#include <nrf_modem/include/nrf_modem_gnss.h>

The leap second information is valid.

This bit in the notification flags tells if receiver has decoded leap second from the navigation message. The leap second is needed for determining GPS-UTC time offset (in seconds). If it is not decoded (bit is zero), the value of 18 seconds is used. This is the effective value since January 1st 2017.