Questions tagged [time]

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Managing time increments in Solidity

Say I want to do a simple operation where a value x is automatically doubled after 1 hour. I want the contract to automatically check that it is time to double the value without needing to explicitly ...
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Get hour of day in Solidity?

What is the most simple way to get hour of the day in Solidity? Will this work? for example creating a condition that works only when it's past 17:00 during that day? if(hour > 17) { //yay this is ...
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1answer
41 views

Is it possible to create a time based nft where there is a fixed expiry date?

I'm looking to create a set where after a set period of time (a week, a month, a year) the token expires and all its value is wiped. Is it possible to do this and if so how?
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23 views

I need to understand a line of code inside a contract => startTime: _startTime == 0 ? currentTime() : _startTime

I am reading a contract from this location : https://gist.github.com/rstormsf/7cfb0c6b7a835c0c67b4a394b4fd9383 I am not able to understand the logic in the code line 72 startTime: _startTime == 0 ? ...
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How critical is timing to the Proof of Stake system?

I’m imagining that in the future it may be profitable for attackers to try to undermine consensus using novel means that are yet unanticipated. So I would like to contribute to speculation on possible ...
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17 views

JIT events on etherum

I would like to write a contract, that fetches a data from oracle in a specific point of time (or later) Is there any option to pop up an event in some point in the future in Ethereum contract? The ...
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17 views

How does time work in a smart contract? [duplicate]

I have seen this question and answers but they do not answer my question. Let say I want to create a smart contract that releases ether when a certain time reaches. How does the blockchain know that ...
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1answer
117 views

Can block.timestamp value change during execution?

I'm facing a doubt while developing an Smart Contract. I was getting current date from block.timestamp several times inside a function. Could this value change during an Smart Contract execution? Or ...
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2answers
826 views

how estimate average time for transactions to smart contract

I have created a decentralized application on the Ethereum Blockchain network. This application receives data from different addresses on the blockchain network and saves this data in the blockchain ...
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4answers
5k views

Time-dependent tests with Hardhat?

For Ganache, there are several solutions. What about Hardhat? They implemented their own local blockchain, Hardhat Network, which is different to Ganache.
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1answer
46 views

Why does Solidity not use the years keyword?

Solidity has keywords like seconds, minutes, hours, days and weeks that are used to specify units of time. Why do they not have years?
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1answer
320 views

Can the block number be set back in ganache?

I know about tools like ganache-time-traveler that let you advance the block number. But is it possible to go back to a lower value?
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1answer
51 views

What are some practical considerations for leap seconds?

From the solidity docs on time units: Take care if you perform calendar calculations using these units, because not every year equals 365 days and not even every day has 24 hours because of leap ...
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1answer
421 views

How do I add 7 years to a current time expressed as a block.timestamp?

Being new to solidity, I find the docs on the Internet very confusing. I simply want to add 7 years to a uint timeInSevenYearsFromNow = (block.timestamp).add(????); What is the value of ???? and ...
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1answer
797 views

Is there any library to estimate timestamp of future block?

I am in need of a library that estimates a date or some sort of timestamp when fed with a future block number (on mainnet or any major testnet). For instance, https://etherscan.io/block/countdown/...
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1answer
512 views

In truffle5, how to manipulate time with evm_increaseTime?

I am using truffle 5 and ganache-cli. I've imported increaseTime as import increaseTime from './helper/increaseTime'; and the increaseTime.js file is like this export default function increaseTime(...