determine the total number of months within a specific duration

I need help with calculating the number of months between two dates, inclusive of both extremes. I have attempted the following code:

  var duration : moment.Duration;
  const contractStartMoment = moment(contractStart); //contractStart=01.05.2021
  const contractEndMoment = moment(contractEnd); //contractEnd=31.05.2021
  duration = moment.duration(contractEndMoment.diff(contractStartMoment));
  var months = duration.asMonths().valueOf();
  console.log('months' + ':' +  duration.asMonths()); //This prints : 0.9856465225158627

The expected result for months should be 1 since it represents a complete month, however, I am receiving 0.9856465225158627 instead. Can someone please point out what mistake I might be making here.

typescriptdate

Answer №1

Could it be that the duration calculation is affected by the specific times when the contracts began and ended? For instance, if both contracts started at noon, then logic would dictate a 30-day span. However, considering the end date falls on the 31st day of the month, this translates to 0.9677 months. Unless the contract initiation precisely aligns with the start and end of the month, the result from asMonths() may yield a fractional representation of a month.

Another aspect to consider is the challenge in converting either 30 or 31 days into months due to the variation in days across different months. Upon examining Moment.js' methodology, it seems they utilize return (days * 4800) / 146097;, factoring in 400 years of months over 400 years of days, accounting for leap year regulations to achieve an optimal monthly average. Consequently, a span of 31 days could actually slightly exceed the typical length of a month.

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