# is_block_time_rule_active · FT4 Rell API · Chromia Docs (concept)

> function is_ block_ time_ rule_ active(r: rule_expression ): boolean Whether the rule, which is expected to have a block_time variable, is active.
It does 

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts/is_block_time_rule_active/

FUNCTION

# is\_block\_time\_rule\_active

```signature
function is_block_time_rule_active(r: rule_expression): boolean
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/accounts/auth_descriptor_rule_validation.rell#lines-485)

Whether the rule, which is expected to have a `block_time` variable, is active.
It does not check whether the rule variable is `block_time`.

Can only be called from an operation.

**Parameters**

* **r** — the rule to check.

**See Also**

* [rule\_expression](https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts/rule_expression/) — for a description of active rules.

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.accounts/is_block_time_rule_active.html)Generated API reference, mirrored from the live docs