Age Calculator
The Age Calculator can determine the age or interval between two dates. The calculated age will be displayed in years, months, weeks, days, hours, minutes, and seconds.
Age Calculation Across Different Systems
The way a person's age is calculated varies across different cultures. This calculator follows the most commonly used age system, where age increases on a person’s birthday. For example, if someone has lived for 3 years and 11 months, their recorded age remains 3 until their next birthday, at which point it increases to 4. Most Western countries follow this system.
However, other cultures use different age-counting methods. In some traditions, age is calculated by including the current year. For instance, a person who is considered 20 years old under the standard system may be counted as being in their 21st year of life in another system.
One notable example is the traditional Chinese age system. In this method, individuals are considered to be 1 year old at birth, and their age increases at the start of the Traditional Chinese New Year rather than on their birthday. For example, if a baby is born one day before the Traditional Chinese New Year, then just two days later, they would be considered 2 years old, even though they are only two days old.
Handling Age Calculations at Month-End
In certain cases, the results of this age calculator may seem unclear, particularly when the starting date falls at the end of a month. For example, the period from February 20 to March 20 is counted as one month. However, when calculating age from February 28, 2022, to March 31, 2022, there are two possible interpretation
(1) If February 28 to March 28 is considered one month, then the result is one month and three days.
(2) If both February 28 and March 31 are treated as the end of their respective months, then the result is one month.
Both interpretations are valid. Similar cases arise when transitioning from months with different day counts, such as April 30 to May 31 or May 30 to June 30. These variations occur due to the uneven number of days in different months. In our calculations, we adopt the first method, where a full month is counted from the start date to the same numerical day in the following month whenever possible.
This system ensures consistency while accounting for variations in calendar structures across different cultures.