Timestamp

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Calls

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set

Set the current time.

This call should be invoked exactly once per block. It will panic at the finalization phase, if this call hasn't been invoked by that time.

The timestamp should be greater than the previous one by the amount specified by MinimumPeriod.

The dispatch origin for this call must be Inherent.

## Complexity - O(1) (Note that implementations of OnTimestampSet must also be O(1)) - 1 storage read and 1 storage mutation (codec O(1)). (because of DidUpdate::take in on_finalize) - 1 event handler on_timestamp_set. Must be O(1).

Attributes

Name	Type
now	T::Moment

Python

call = substrate.compose_call(
    'Timestamp', 'set', {'now': 'u64'}
)

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Storage functions

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DidUpdate

Did the timestamp get updated in this block?

Python

result = substrate.query(
    'Timestamp', 'DidUpdate', []
)

Return value

'bool'

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Now

Current time for the current block.

Python

result = substrate.query(
    'Timestamp', 'Now', []
)

Return value

'u64'

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Constants

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MinimumPeriod

The minimum period between blocks. Beware that this is different to the expected period that the block production apparatus provides. Your chosen consensus system will generally work with this to determine a sensible block time. e.g. For Aura, it will be double this period on default settings.

Value

3000

Python

constant = substrate.get_constant('Timestamp', 'MinimumPeriod')

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