Does the business day count exclude Cambodian public holidays?

Currently, the business day counter excludes only Saturdays and Sundays. Cambodian national holidays (e.g., Khmer New Year, Pchum Ben) are not automatically excluded since holiday schedules vary by year. We recommend cross-checking critical deadlines against the official Royal Government holiday calendar.

What is the maximum date range this tool can calculate?

The JavaScript Date object handles dates from approximately 275,760 CE down to 271,821 BCE, so the practical range covers all modern and historical dates from 0001 CE onward without limitation.

Calculators100% Client-Side

All Tools

Date Difference & Calculation

Calculate the duration between two dates in days, weeks, and months, or compute a future/past date by adding or subtracting specific intervals.

Start Date

End Date

Total Duration

30days

Working Days21 days

Weekend Days9 days

Weeks4.3 weeks

About & How It Works

Technical calculation logic, standards, and operational details

The Date Difference & Calculation tool is a dual-mode calendar arithmetic utility. In Difference Mode, it computes the exact number of calendar days, business weekdays (excluding Saturday and Sunday), weeks, months, and years between any two selected dates. In Add/Subtract Mode, it calculates a future or past date by adding or subtracting a specified number of days, weeks, months, or years from a starting date. Both modes consider the full complexity of the Gregorian calendar, including varying month lengths and leap year corrections. The tool is essential for contract deadline management, probation period calculation, visa expiry tracking, and project timeline planning.

Algorithmic Logic & Calculation

Date difference uses JavaScript's built-in Date arithmetic, subtracting the smaller timestamp from the larger and converting the millisecond result into days (÷ 86,400,000). Business day count iterates through each calendar day, excluding those with getDay() values of 0 (Sunday) or 6 (Saturday). For month and year differences, the engine applies the ISO 8601 duration decomposition algorithm, borrowing days from months when the end day is less than the start day. The Add/Subtract mode uses locale-aware Date mutation to correctly handle month-end boundary cases (e.g., adding 1 month to January 31st gives February 28th/29th, not March 3rd).

Technical Standards & Compliance

Date arithmetic follows ISO 8601:2019 date and duration standard. Gregorian calendar rules are applied including leap year detection per RFC 3339.

Key Features & Capabilities

Calendar & Business Day Counting

Computes both total calendar days and working weekdays between any two dates.

Add or Subtract Date Intervals

Computes a target date by adding or subtracting days, weeks, months, or years from any starting date.

Month-End Boundary Handling

Correctly handles edge cases like adding months to January 31st or skipping February 29th in non-leap years.

Multi-Unit Result Display

Shows result simultaneously as total days, weeks, months, and years for flexible reporting.

Practical Real-World Use Cases

Contract & Visa Deadline Tracking

Expatriates in Cambodia track how many days remain on their business or tourist visa before renewal is required.

Employee Probation Period Calculation

HR managers calculate the end date of a 3-month or 6-month employment probation period to schedule confirmation reviews.

Project & Construction Deadline Planning

Project managers and construction supervisors add working days to a start date to calculate the delivery milestone.

How to Use

Choose "Difference Between Dates" or "Add/Subtract Date".
Select the dates and duration.
Instantly view the result.

In-Depth Educational Guide

Understanding the Buddhist Era (B.E.) Calendar in Cambodia

Explore the computational logic behind the Buddhist Era calendar, the 543/544-year Gregorian offset, Cambodian lunar-solar astronomical adjustments, and traditional religious holidays.

Read Full Guide