ForHosting KIT · Developer Utilities

Start of next year

Start of Next Year accepts one explicit date in ISO YYYY-MM-DD form and returns January 1 of the following year.

● BetaFree · in your browser

Use it from WebAPIEmailTelegramApp soon

The calculation is deterministic: it validates the supplied Gregorian date, increments its year, and formats the result without reading the current time or depending on a machine's locale or time zone. That makes it suitable for repeatable automation, tests, billing periods, retention schedules, and any workflow where the same input must always produce the same output.

Provide an explicit ISO calendar date

Send the date field as a complete YYYY-MM-DD value, including leading zeroes for the month and day. The capability accepts Gregorian years from 0001 through 9998, leaving room to return the following year in the same four-digit format. It rejects incomplete dates, timestamps, time-zone suffixes, impossible month numbers, and invalid days such as April 31 or February 29 in a common year. This strict input contract is useful when dates come from forms, spreadsheets, databases, or other services because a malformed value fails clearly instead of being silently adjusted. The supplied month and day do not change the shape of the answer; they are still validated so that the input represents a real calendar day. For example, 2024-08-19 produces 2025-01-01, while 2024-02-29 is accepted because 2024 is a Gregorian leap year. Pass the source date itself, not a phrase such as next year or the current date, because this operation never infers missing temporal context.

Understand the deterministic UTC result

The result contains the validated source date, the numeric following year, and start_of_next_year as January 1 in YYYY-MM-DD form. The algorithm parses the four date components as decimal integers, checks the Gregorian leap-year and month-length rules, adds exactly one to the year, and formats month and day as 01-01. It does not construct a Date object, inspect the system clock, read a browser locale, or convert through a local time zone. Consequently, a request made in UTC, New York, Tokyo, or an offline browser produces the same JSON for the same input. Calling this UTC calendar arithmetic means the returned date is an unambiguous civil-date boundary suitable for representing 00:00:00 UTC when a downstream system later needs a timestamp. No timestamp is returned here, so there is no accidental offset or daylight-saving conversion. This distinction matters around New Year's Eve, when clock-based shortcuts can select different years depending on where code runs. The explicit input remains the sole source of temporal truth.

Use the boundary safely in workflows

Use this capability when a workflow needs the first calendar day after the source date's year: opening the next annual reporting period, creating a renewal boundary, calculating the beginning of a future tax year that follows the calendar year, or producing fixtures for date-sensitive tests. Store or compare start_of_next_year as an ISO date when the surrounding system works with date-only values. If another API requires an instant, append an explicit UTC time only in that downstream layer, for example by treating the returned boundary as midnight UTC according to that API's documented format. Do not interpret the output as one year after the input date; those are different operations. One year after 2024-08-19 would be 2025-08-19, whereas the start of the next year is 2025-01-01. The request price is $0.002 per item through the API, and the pure calculation is also appropriate for the generated browser client. Because no current clock is consulted, saved examples and repeated jobs remain reproducible long after they were created.

What you can do with it

Open the next reporting year

Turn any dated record into the January 1 boundary for its following annual reporting period.

Build stable test fixtures

Generate a predictable next-year boundary without mocking the system clock or controlling a test runner's time zone.

Schedule annual retention rules

Derive the next calendar-year start from an explicit document or event date before applying a retention interval.

FAQ

Does this use today's date?

No. It uses only the explicit date supplied in the request and never reads the current system clock.

What does a request cost?

Each API request costs $0.002.

Are leap years validated?

Yes. February 29 is accepted only when the supplied year is a Gregorian leap year.

Why is the maximum input year 9998?

The following year must remain representable as a four-digit ISO date, so 9999 cannot be incremented within this contract.

Is this the same as adding one year?

No. It always returns January 1 of the following year, regardless of the source month and day.

Does the result depend on a time zone?

No. The calculation uses date components directly and performs no local-time conversion.

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

POSThttps://api.kit.forhosting.com/date/start-of-next-year

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/start-of-next-year \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"date":"2024-08-19"}'

const res = await fetch("https://api.kit.forhosting.com/date/start-of-next-year", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "date": "2024-08-19"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/date/start-of-next-year",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "date": "2024-08-19"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/date/start-of-next-year", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"date":"2024-08-19"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"date":"2024-08-19"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/date/start-of-next-year", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "date": "2024-08-19"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "date.start_of_next_year",
  "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

Per request$0.002

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.

Read the full KIT documentation →