Something like this?
NRF.on('NFCon', function() { var currentTime = new Date(); NRF.nfcURL('https://www.yourwebpage.com?time='+currentTime.toISOString().substr(0,16)); });
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Something like this?