timestamp time wakeup

Hi,
我们使用DA14580 SDK 5.0.4。
We need a way to get a global timestamp since start in seconds.
The easy way is to set a timer to run every minute and increase a counter by 60 - and getting an inaccurate measurement (accuracy of minutes).
What if we need the timestamp in accuracy of seconds? Do we need to wake up every second?
有一些register\memory-address to just read a timestamp (in some units)?
If we just woke up from a timer this would be easy - if the timer is X seconds we would increase the counter by X every time we wake up.