This a somewhat crude, proof-of-concept, not robust, not efficient, decoder for the timesignal broadcast by Poland as phase modulation on 225 kHz.
It is to be used by first opening in one browser tab, tuned to 225 kHz CW, then opening this page in a second tab, and then having some patience.
I've tested it under Firefox, and it may also work under Chrome and Opera; other browsers may lack the necessary communication between tabs.

Documentation of the signal can be found (in Polish) at; some comments of mine are at

Comments about this page can be sent to

Status: Connecting to WebSDR tab

Incoming signals (phase of 225 kHz carrier):

Received frames:

Audio frequency: Hz.