Age Calculator
Age is evaluated from Date of Birth and Age On Date. The calculation reports Years, Months and Days.
Results
About the Age Calculator
The calculator uses a custom php logic configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.
Formula basis:
Age = Target_Date - Birth_Date, expressed as complete calendar years, then remaining months, then remaining days.
5. Next birthday: Days until the next occurrence of the birth day/month
Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.
Formula & How It Works
The calculation applies the following relations exactly as recorded in the metadata: Age = Target_Date - Birth_Date, expressed as complete calendar years, then remaining months, then remaining days. 5. Next birthday: Days until the next occurrence of the birth day/month Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.
Worked Examples
Example 1: Standard Birthday Age
Inputs
With Date of Birth = 1990-07-15 and Age On Date = 2026-04-27 as the stated inputs, the result is Years = 35 years, Months = 9 months and Days = 12 days. Each value corresponds to the declared output fields.
Example 2: Leap Year Birthday (Feb 29)
Inputs
With Date of Birth = 2000-02-29 and Age On Date = 2026-04-27 as the stated inputs, the result is Years = 26 years, Months = 1 months and Days = 29 days. Each value corresponds to the declared output fields.
Example 3: Retirement Eligibility Check
Inputs
With Date of Birth = 1965-11-03 and Age On Date = 2026-04-27 as the stated inputs, the result is Years = 60 years, Months = 5 months and Days = 24 days. Each value corresponds to the declared output fields.
Example 4: Infant Age in Months & Days
Inputs
With Date of Birth = 2025-09-10 and Age On Date = 2026-04-27 as the stated inputs, the result is Years = 0 years, Months = 7 months and Days = 17 days. Each value corresponds to the declared output fields.
Common Use Cases
- Calculate exact age in years months days
- Find age on a specific past or future date
- Determine eligibility age for benefits or licenses