Retirement date from birthdate
Born on 15 June 1964 with a retirement age of 67? Your eligibility date is 15 June 2031. Enter a birth date and the age your plan sets to get the exact anniversary, with 29 February births handled clearly. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Birth date
- 1964-06-15
- Retirement age
- 67
- Retirement date
- 2031-06-15
- Retirement year
- 2,031
A retirement eligibility date is usually an anniversary calculation: take a person's recorded birth date and advance it by the number of whole calendar years required by a pension plan, workplace policy, or personal scenario. This calculator accepts an explicit ISO birth date and a target retirement age, validates both values, and returns the corresponding Gregorian calendar date. It never reads the current date, guesses a jurisdiction, or applies a government benefit rule. The same inputs therefore produce the same answer in every timezone and on every run, including the special case of a February 29 birth whose target year is not a leap year.
Enter the birth date and target age as explicit facts
Fixed-width ISO input prevents ambiguous exchanges such as 03/04/1960, which different readers may interpret as March 4 or April 3. The calculator checks the Gregorian calendar rather than merely checking the shape of the text, so impossible dates such as 1961-02-29 or 1970-04-31 are rejected. The age must be a numeric integer; a quoted number, a fraction, infinity, or a negative value is not silently converted.
They also keep the calculation separate from policy interpretation. Enter the age stated by the retirement plan or scenario you are evaluating, because the tool does not infer it from a country, occupation, employment record, contribution history, sex, disability status, or changing legislation. If a policy uses different ages for different people, determine the applicable age first and then submit that explicit value with the recorded birth date.
The result describes the birthday anniversary calculation only, not approval for payments or benefits.
Understand the deterministic calendar rule
Gregorian leap years are divisible by four, except century years are not leap years unless divisible by four hundred. This means 2000 was a leap year while 1900 was not. A person born on February 29 presents the only case in which the same month and day may not exist in the target year.
When the target year is a leap year, February 29 is preserved and the flag is false. All other valid dates retain their original month and day. The implementation uses integer calendar arithmetic and string formatting only.
It does not instantiate JavaScript Date, inspect the host clock, apply daylight-saving offsets, or convert through a local timezone. No current age is calculated, and the output does not change when today's date changes.
Use the result in planning without treating it as legal advice
Because the output is a calendar date without a time of day, downstream systems should keep it as a civil date rather than converting it to midnight in a local timezone. Such conversion can shift the displayed day when serialized or viewed elsewhere. The result is intentionally narrow: it does not decide whether service requirements have been met, whether an application window opens earlier, whether benefits start on the birthday or the following month, or whether a local rule treats leap-day birthdays differently.
Those are plan and jurisdiction questions that belong in a separate policy layer. Confirm material retirement decisions with the relevant plan administrator or official authority.
What you can do with it
Employee retirement planning
Turn a recorded birth date and a policy-selected retirement age into a consistent calendar date for a planning preview.
Pension workflow preparation
Create the anniversary date used by a downstream eligibility process after separate rules have established the applicable target age.
Calendar regression testing
Generate deterministic expected dates for ordinary birthdays, century boundaries, and February 29 cases without timezone-dependent behavior.
FAQ
Does this calculator determine my official retirement age?
No. You provide the target age explicitly. The capability performs calendar arithmetic and does not interpret laws, pension plans, contribution records, or personal eligibility conditions.
How are February 29 births handled?
If the target year is a leap year, February 29 is preserved.
Why must the birth date use YYYY-MM-DD?
Strict ISO form removes regional ambiguity and allows the calculator to reject impossible Gregorian dates before producing a result.
Does today's date or my timezone affect the answer?
No. The algorithm uses only the supplied birth date and retirement age.
Does the date mean I can start receiving my pension then?
No. It only shows the birthday on which you reach the age you entered. Whether you qualify for payments or benefits depends on your plan or the law that applies to you.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/date/retirement-date \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"birth_date":"1964-06-15","retirement_age":67}'const res = await fetch("https://api.kit.forhosting.com/date/retirement-date", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"birth_date": "1964-06-15",
"retirement_age": 67
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/date/retirement-date",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"birth_date": "1964-06-15",
"retirement_age": 67
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/date/retirement-date", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"birth_date":"1964-06-15","retirement_age":67}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"birth_date":"1964-06-15","retirement_age":67}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/date/retirement-date", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"birth_date": "1964-06-15",
"retirement_age": 67
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "date.retirement_date",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
Enter the birth date and target age as explicit facts
Provide birth_date as a strict ISO calendar date in YYYY-MM-DD form and retirement_age as a whole number of years from zero through two hundred.
Understand the deterministic calendar rule
The calculation adds retirement_age to the year component of birth_date while preserving the month and day whenever that calendar day exists. For that case, this capability uses an explicit and stable convention: when the retirement year is not a leap year, the returned eligibility date is February 28 and leap_day_adjusted is true. Consequently, a request made in Tokyo, London, or New York returns identical JSON.
Use the result in planning without treating it as legal advice
The response echoes the normalized birth_date and retirement_age, then supplies retirement_date, retirement_year, and leap_day_adjusted. For automation, the API price for a successful item is $0.002; the browser calculation uses the same pure logic. Invalid input produces a typed error rather than a plausible-looking date, which lets calling systems stop and request corrected data instead of propagating a faulty eligibility record.
Technical questions
What does an API calculation cost?
A successful API request costs $0.002 per item. The browser calculator runs the same deterministic logic locally.