timekeeper

My first (abandoned unfinished) web application for time tracking
git clone git://jacobedwards.org/timekeeper
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counter.js (1099B)

      1 function gettime() {
      2 	return Math.trunc(Date.now() / 1000)
      3 }
      4 
      5 function parseduration(s) {
      6 	let hr = s.match(/(\d+)\s*h/);
      7 	let mn = s.match(/(\d+)\s*m/);
      8 	let sc = s.match(/(\d+)\s*s/);
      9 	return (parseInt(hr[1]) * 3600) + (parseInt(mn[1]) * 60) + parseInt(sc[1])
     10 }
     11 
     12 function sn(n) {
     13 	return String(n).padStart(2, "0")
     14 }
     15 
     16 function duration(duration) {
     17 	let mn = Math.trunc(duration / 60)
     18 	let sc = duration % 60
     19 	let hr = Math.trunc(mn / 60)
     20 	mn = mn % 60
     21 
     22 	return sn(hr) + ':' + sn(mn) + ':' + sn(sc)
     23 }
     24 
     25 function updatetime(counter, start, total, total_elapsed) {
     26 	let elapsed = gettime() - start
     27 	counter.textContent = duration(elapsed)
     28 	if (total)
     29 		total.textContent = duration(total_elapsed + elapsed)
     30 	/* if (start.checkVisibility()) */
     31 	setTimeout(updatetime, 1000, counter, start, total, total_elapsed)
     32 }
     33 
     34 let counter = document.getElementById("counter")
     35 if (counter) {
     36 	let d = parseduration(counter.dateTime)
     37 	let total = document.getElementById("total")
     38 	if (total)
     39 		updatetime(counter, gettime() - d, total, parseduration(total.dateTime) - d)
     40 	else
     41 		updatetime(counter, gettime() - d)
     42 }