# update-crowdloan-end (/docs/tx/update-crowdloan-end)

Extends or shortens the contribution window. The new end is re-validated
against the current block: it must be in the future and fall within the
chain's minimum/maximum crowdloan duration (roughly 7 to 60 days)
measured from now. Only the creator may change it, and only while the
loan has not been finalized.

| Signer    | Pallet    | Wraps                  |
| --------- | --------- | ---------------------- |
| `coldkey` | Crowdloan | `Crowdloan.update_end` |

## Parameters [#parameters]

| Parameter      | Type    | Required | Description                                                                                                                                |
| -------------- | ------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| `crowdloan_id` | integer | yes      | Identifier of the crowdloan, assigned when it was created.                                                                                 |
| `new_end`      | integer | yes      | New block number at which the crowdloan stops accepting contributions. Must be in the future and roughly 7-60 days from the current block. |

Address parameters (`--hotkey`, `--coldkey`, `--dest`, ...) accept a raw ss58
address, an address-book or proxy-book name, or a local wallet/hotkey name.

## CLI [#cli]

Preview with `--dry-run` (shows fee, effects, and policy result without
submitting), then submit:

```bash
btcli tx update-crowdloan-end \
  --crowdloan-id <int> \
  --new-end <int> --dry-run
btcli tx update-crowdloan-end \
  --crowdloan-id <int> \
  --new-end <int> -w my_coldkey
```

## Python [#python]

```python
import bittensor as sub
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = sub.UpdateCrowdloanEnd(crowdloan_id=0, new_end=0)

async with sub.Client("finney") as client:
    plan = await client.plan(intent, wallet)   # fee, effects, policy — no submission
    result = await client.execute(intent, wallet)
    if not result.success:
        print(result.error.code, result.error.remediation)
```

Or build it by op name, as an agent would:

```python
await client.execute_tool("update_crowdloan_end", {...}, wallet)
```