---
title: "Reschedule SMS messages"
method: PUT
path: "/sms/1/bulks"
tags: ["channels", "sms", "outbound-sms", "manage-scheduled-sms-messages"]
---

# Reschedule SMS messages

`PUT /sms/1/bulks`

## Request

- Base URL: `https://api.infobip.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.infobip.com/sms/1/bulks`
- Auth: one of:
  - OAuth 2
    - Client credentials
    - Token URL: `https://api.infobip.com/auth/1/oauth2/token`
  - API key in header `Authorization`
  - API key in header `Authorization`
  - HTTP basic

Change the date and time of already [scheduled messages](https://www.infobip.com/docs/sms/sms-over-api#schedule-sms). To schedule a message, use the `sendAt` field when [sending a message](#channels/sms/sms-messaging/outbound-sms/send-sms-messages).

## Query parameters

- `bulkId` string, required: Unique ID assigned to the request if messaging multiple recipients or sending multiple messages via a single API request.

## Request body

- 2e05f28ea1ad0c8ab6683b6adca8c2dc53bf0d4883946379aef59ba8417e5029BulkRequest
  - `sendAt` string, date-time, required: Date and time when the message is to be sent. Used for scheduled SMS (see [Scheduled SMS endpoints](#channels/sms/get-scheduled-sms-messages) for more details). Has the following format: `yyyy-MM-dd'T'HH:mm:ss.SSSZ`, and can only be scheduled for no later than 180 days in advance.

## Response `200`

successful response

- 2e05f28ea1ad0c8ab6683b6adca8c2dc53bf0d4883946379aef59ba8417e5029BulkResponse
  - `bulkId` string: Unique ID assigned to the request if messaging multiple recipients or sending multiple messages via a single API request.
  - `sendAt` string, date-time: Date and time when the message is to be sent. Used for scheduled SMS (see [Scheduled SMS endpoints](#channels/sms/get-scheduled-sms-messages) for more details). Has the following format: `yyyy-MM-dd'T'HH:mm:ss.SSSZ`, and can only be scheduled for no later than 180 days in advance.

## Other responses

- `400`: Error responses
- `401`: Unauthorized
- `403`: Forbidden
- `404`: Bulk not found responses
- `500`: Internal Server Error

---

[API](https://skmtc.dev/infobip/apis/infobip-openapi-specification-2.md) - [All operations](https://skmtc.dev/infobip/apis/infobip-openapi-specification-2/llms.txt) - [OpenAPI document](https://skmtc.dev/infobip/apis/infobip-openapi-specification-2/revisions/4a6f8044a927?raw)