ForHosting KIT · Dates & time

Week of month calculator

Enter a date to find which week of its month it falls in: 25 July 2026 is in week 4, because the 25th divided by seven, rounded up, gives 4. Weeks are counted in blocks of seven days from the 1st. Free in your browser.

Free
Runs in your browser
No sign-up
Your data stays on your device

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Worked example

If you enter

Year: 2,026
Month: 7
Day: 25

You get

Week of month: 4
Weekday: 6
ISO date: 2026-07-25

Search intent: week of month calculator. No network calls or random seeds are required. Failed jobs are not billed.

How the week of the month is counted

This calculator splits every month into blocks of seven days that start on the 1st. Days 1 to 7 make up week 1, the next seven days make up week 2, and so on. To find the week for any date, divide the day of the month by seven and round the result up to the next whole number. For 25 July 2026, 25 divided by seven is a little over three, so the date sits in week 4. The result also shows the weekday, a Saturday in this case, and the date written as 2026-07-25.

When it helps and what to watch for

Counting weeks this way is handy for schedules and rules phrased as the first, second or fourth week of a month, and for grouping a month's records into simple, equal blocks. Keep in mind that these weeks do not follow calendar rows: they ignore whether a week starts on Monday or Sunday, so a block can run from a Wednesday to a Tuesday. Longer months spill into a fifth week, which holds the 30th and the 31st. The answer depends only on the date you enter, with no network calls, so it is the same every time.

What you can do with it

Teaching

Pinned goldens.

FAQ

How is the week of the month worked out?

Divide the day of the month by seven and round up. For 25 July 2026, 25 divided by seven is a little over three, so the date falls in week 4.

Does the week of the month depend on the weekday?

No. Weeks are counted in blocks of seven days starting on the 1st, whatever weekday that is. The weekday is shown separately, so the 25th is in week 4 in any month.

Can a month have a fifth week?

Yes. Days after the first four blocks of seven, such as the 30th or 31st, fall in week 5. Only a February without a leap day ends exactly at the close of week 4.

What else does the result show?

Besides the week number, you get the weekday and the date written in ISO form. For 25 July 2026 that is a Saturday, shown as 2026-07-25.

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

POSThttps://api.kit.forhosting.com/date/week-of-month

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/week-of-month \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"year":2026,"month":7,"day":25}'

const res = await fetch("https://api.kit.forhosting.com/date/week-of-month", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "year": 2026,
    "month": 7,
    "day": 25
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/date/week-of-month",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "year": 2026,
    "month": 7,
    "day": 25
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/date/week-of-month", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"year":2026,"month":7,"day":25}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"year":2026,"month":7,"day":25}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/date/week-of-month", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "year": 2026,
  "month": 7,
  "day": 25
}

Example response

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

Technical notes

Ordinal week-of-month = ceil(day/7) for a civil date. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.

How it works

No network calls or random seeds are required. Failed jobs are not billed. No network calls or random seeds are required. Failed jobs are not billed. Ordinal week-of-month = ceil(day/7) for a civil date. week_of_month = ⌈day/7⌉; also returns weekday. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.

Inputs, limits and rounding

Optional decimals use half-up once. Outputs echo inputs. No network calls or random seeds are required. Failed jobs are not billed. No network calls or random seeds are required. Failed jobs are not billed. Provide required JSON fields. Invalid types raise invalid_input. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.

When to use it

Use when search intent matches. No network calls or random seeds are required. Failed jobs are not billed. No network calls or random seeds are required. Failed jobs are not billed. Ordinal week-of-month = ceil(day/7) for a civil date. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.

Integration use cases

Quick check

Free widget.

Automation

Same JSON via API.

Technical questions

Free?

Yes tier A.

Network?

No.

Bad input?

invalid_input.

API?

Yes.

Locales?

EN-only; Nitro hydrates.

Read the full KIT documentation →

Run — free