Скачать или смотреть Calculating Months and Days from a Date Using dayjs

Discover how to accurately calculate a person's age in `months` and `days` using `dayjs`, along with practical tips and code examples.
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This video is based on the question https://stackoverflow.com/q/64055091/ asked by the user 'blaze-rowland' ( https://stackoverflow.com/u/3529975/ ) and on the answer https://stackoverflow.com/a/64055305/ provided by the user 'WissenIstNacht' ( https://stackoverflow.com/u/13041180/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Calculate Months and Days Using dayjs

Working with dates can often feel like navigating a complex maze. If you've ever tried to calculate someone's age in months and days, you might have encountered some challenges similar to the one posed by our reader. Let's break down the problem and provide a clear solution to calculate a person's age in both months and days using the dayjs JavaScript library.

The Problem

Imagine you need to determine how old someone is in months and days since their birthdate. For instance, if a person was born on July 3rd, 2020, you want the output to reflect something like:

[[See Video to Reveal this Text or Code Snippet]]

What You Have So Far

You have the following code to calculate the number of months:

[[See Video to Reveal this Text or Code Snippet]]

Here, value represents the person’s birth date. While this calculates the months accurately, you might find (like our reader) that finding the remaining days isn’t as straightforward.

The Solution

To calculate both months and days, you can follow these steps:

Step 1: Calculate the Total Months

Using the code you already possess, you can determine the total months between the current date and the birthdate:

[[See Video to Reveal this Text or Code Snippet]]

Where birthDate is the date of birth you’re working with.

Step 2: Calculate the Remaining Days

To find the number of days left after calculating the full months, you'll need to:

Get the day of the month of the birth date.

Get the day of the current month.

Subtract the two values and take the absolute value to ensure it’s positive.

Here’s how you can do that:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Combine Results

Finally, you’ll need to combine both results to provide the output. Here’s a snippet that does both calculations:

[[See Video to Reveal this Text or Code Snippet]]

Important Note

When calculating age in months and days, be mindful that months have different lengths (28, 30, or 31 days). This might lead to inaccuracies if you simply subtract days. However, this approach provides a close approximation.

Conclusion

Calculating someone's age in terms of months and days using dayjs can be easily achieved by leveraging its capabilities alongside some straightforward arithmetic. Remember always to account for the variability in month lengths, and seek to provide a clear definition for what you mean by "2 months later." This way, you can effectively manage the remaining differences.

With this guide, you should be equipped to tackle date calculations with confidence. Happy coding!