MonthsWith

MonthsWith is a lightweight date‑handling library designed for use in web and server‑side applications. It was first released in 2018 and has since become a popular alternative to larger libraries such as Moment.js and date-fns when only month‑level precision is required. The primary purpose of MonthsWith is to calculate the number of months between two dates, generate lists of month labels, and perform simple month‑based arithmetic. Its API functions include monthsBetween(start, end) which returns an integer count; addMonths(date, n) which advances or rewinds a date by n months; and monthNames(offset) which produces an array of month names adjusted by the specified offset.

Because MonthsWith operates at a higher granularity than day‑level libraries, it omits support for day‑time zones and daylight‑saving time adjustments. The library is written in JavaScript with a small footprint of about 3 KB when minified, and it is distributed under the MIT license for free use in commercial or open source projects. It provides basic integration with Node.js environments through npm and can also be incorporated in browser builds via script tags or bundlers such as Webpack and Rollup.

Users typically employ MonthsWith in scheduling systems, reporting tools, or anywhere passing month indices between components is required. The library’s simplicity and deterministic output make it suitable for applications that need to display month‑based timelines or calculate pay periods without the overhead of full calendar support.