function analyseTime()

in charts/shared/sonic.js [224:285]

• 52 lines of code
• 7 McCabe index (conditional complexity)

function analyseTime(data, settings) {
  let results = {}
  results.interval = null
  results.timescale = null
  results.suggestedFormat = null
  let xVar = null 
  let dataKeys = Object.keys(data[0])

  let xColumn = checkNull(settings, 'xColumn')
  if (!xColumn) {
    xVar = dataKeys[0]
  }
  else {
    xVar = xColumn
  }

  let time1 = data[0][xVar]
  let time2 = data[1][xVar]
 
  let timeDiff = Math.abs(time2 - time1); // difference in milliseconds

  // Define time constants
  const ONE_HOUR = 1000 * 60 * 60;
  const ONE_DAY = ONE_HOUR * 24;
  const ONE_WEEK = ONE_DAY * 7;
  const ONE_MONTH = ONE_DAY * 28; // approximate
  const ONE_QUARTER = ONE_MONTH * 3; // approximate
  const ONE_YEAR = ONE_DAY * 365;

  // Determine the appropriate time unit and strftime format
  if (timeDiff < ONE_DAY) {
    results.interval = timeDiff / ONE_HOUR;
    results.timescale = 'hour';
    results.suggestedFormat = '%H:%M'; // hours and minutes
  } else if (timeDiff < ONE_WEEK) {
    results.interval = timeDiff / ONE_DAY;
    results.timescale = 'day';
    results.suggestedFormat = '%d %b'; // day and month
  } else if (timeDiff < ONE_MONTH) {
    results.interval = timeDiff / ONE_WEEK;
    results.timescale = 'week';
    results.suggestedFormat = '%d %b'; // week of the year
  } else if (timeDiff < ONE_QUARTER) {
    results.interval = timeDiff / ONE_MONTH;
    results.timescale = 'month';
    results.suggestedFormat = '%B %Y'; // month and year
  } 
  else if (timeDiff < ONE_YEAR) {
    results.interval = timeDiff / ONE_QUARTER;
    results.timescale = 'quarter';
    results.suggestedFormat = '%B %Y'; // month and year
  }
  else {
    results.interval = timeDiff / ONE_YEAR;
    results.timescale = 'year';
    results.suggestedFormat = '%Y'; // year
  }

  return results;


}