Bug Report

🔎 Search Terms

date constructor month

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about naming conventions

⏯ Playground Link

Playground link with relevant code

💻 Code

// this is May 2022
new Date(2022, 4)

🙁 Actual behavior

The date constructor documentation gives no indication that the month parameter is zero index based (January is month 0, February is month 1). This can cause off-by-one error bugs that are hard to detect.

🙂 Expected behavior

I expected the documentation to be clear about the type of value expected in the constructor. For example:

• rename month parameter to monthIndex (MDN also uses monthIndex https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date#syntax)
• add JSDoc for the constructor explaining the month parameter