# 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    | Origin                                 | Pallet    | Wraps                                                                  |
| --------- | -------------------------------------- | --------- | ---------------------------------------------------------------------- |
| `coldkey` | signed account (pallet role may apply) | Crowdloan | [`Crowdloan.update_end`](/code/pallets/crowdloan/src/lib.rs#L861-L887) |

## 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 bt
from bittensor.wallet import Wallet

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

sub = bt.Subtensor()
plan = sub.plan(intent, wallet)   # fee, effects, policy — no submission
result = sub.execute(intent, wallet)
if not result.success:
    print(result.error.code, result.error.remediation)
```

(`bt.Subtensor` is also the async client — `async with bt.Subtensor() as client:`
— see [The client](/docs/concepts/client).) Or build the intent by op name, as
an agent would:

```python
result = sub.execute_tool("update_crowdloan_end", {...}, wallet)
```

## On-chain implementation [#on-chain-implementation]

`Crowdloan.update_end` — [`pallets/crowdloan/src/lib.rs#L863`](/code/pallets/crowdloan/src/lib.rs#L861-L887):

```rust
#[pallet::call_index(7)]
#[pallet::weight(T::WeightInfo::update_end())]
pub fn update_end(
    origin: OriginFor<T>,
    #[pallet::compact] crowdloan_id: CrowdloanId,
    #[pallet::compact] new_end: BlockNumberFor<T>,
) -> DispatchResult {
    let who = ensure_signed(origin)?;
    let now = frame_system::Pallet::<T>::block_number();

    let mut crowdloan = Self::ensure_crowdloan_exists(crowdloan_id)?;
    ensure!(!crowdloan.finalized, Error::<T>::AlreadyFinalized);

    // Only the creator can update the min contribution.
    ensure!(who == crowdloan.creator, Error::<T>::InvalidOrigin);

    Self::ensure_valid_end(now, new_end)?;

    crowdloan.end = new_end;
    Crowdloans::<T>::insert(crowdloan_id, &crowdloan);

    Self::deposit_event(Event::<T>::EndUpdated {
        crowdloan_id,
        new_end,
    });
    Ok(())
}
```

Every file is browsable under [/code](/code) exactly as built into the runtime, or as plain text under `/code/raw/<path>` (index: [`/code/index.json`](/code/index.json)).