---
title: SubscriptionContractCalculationMonthdayAnchorInput - GraphQL Admin
description: The input fields for monthday anchor in the calculate API.
api_version: 2026-10
source_url:
  html: >-
    https://shopify.dev/docs/api/admin-graphql/latest/input-objects/SubscriptionContractCalculationMonthdayAnchorInput
  md: >-
    https://shopify.dev/docs/api/admin-graphql/latest/input-objects/SubscriptionContractCalculationMonthdayAnchorInput.md
api_name: admin
api_type: graphql
type: input-object
---

# Subscription​Contract​Calculation​Monthday​Anchor​Input

input\_object

The input fields for monthday anchor in the calculate API.

## Fields

* day​Of​Month

  [Int!](https://shopify.dev/docs/api/admin-graphql/latest/scalars/Int)

  non-null

  Day of month: 1-31. For months with fewer days, will use the last day of the month.

***

## Input objects using this input

* [Subscription​Contract​Calculation​Anchor​Input.monthday](https://shopify.dev/docs/api/admin-graphql/latest/input-objects/SubscriptionContractCalculationAnchorInput#fields-monthday)

  INPUT OBJECT

  The input fields for subscription contract anchors used for contract calculation. This is a oneOf input: one, and only one, field can be provided.

***

## Map

### Input objects using this input

* [Subscription​Contract​Calculation​Anchor​Input.monthday](https://shopify.dev/docs/api/admin-graphql/latest/input-objects/SubscriptionContractCalculationAnchorInput#fields-monthday)