Questions tagged [time]

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How to simulate time on testnet?

I deployed contracts to kovan testnet, but I have certain places where there is a 1 week duration. How do I speed up time on testnet so I can easily test these things? (For example speeding it up to ...
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Block propagation delay

I have some doubts related to block propagation time. In a network built with Hyperledger Besu, I have 4 AWS machines, 3 in Paris and 1 more in Oregon. The block propagation times are crazy, like 2 ...
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3 answers
53 views

How to setup a timer for a NFT? [duplicate]

I want to create a nft ERC721 that after 30 days it will be autoburned. How I can achive this?
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1 answer
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Time-based token distribution in smart contract

Say I have a smart contract for exchanging 6 Token_A with 6 Token_B with an additional time condition when only 1 exchange can happen every 1 month (we don't care about msg.sender here. we can assume ...
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1 vote
1 answer
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how to deploy the smart contract in brownie

Error: Final argument must be a dict of transaction parameters that includes a `from` field specifying the address to deploy from Terminating local RPC client... smart contract: pragma solidity ^0.5....
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1 answer
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How can I advance time when testing on Rinkeby network?

I've successfully deployed my contract to Rinkeby. Testing on Remix everything worked fine. I'm now writing some tests in Javascript but I don't know how to advance time to test functions in a ...
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1 vote
1 answer
169 views

Is it better practice to use smaller uint sizes when applicable?

My understanding of uint sizes is that smaller sizes will decrease gas costs. In my current dapp I'm building, I am dealing with time, for which it seems that uint32 will be plenty for my purposes (...
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0 answers
112 views

Fast forwarding time in hardhat testing?

My contract is calling a method on a different contract to track how the response changes. I am unit testing with a forking mainnet network in hardhat, which allows me to interact with that other ...
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1 answer
99 views

Use scheduler in smart contract solidity

I am looking for a way to automate the execution of a function. Here is a very simple example of a function that will change the state of a boolean variable. pragma solidity ^0.8.2; contract Test{ ...
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1 answer
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Execute instructions later

I'm looking to create a function that executes instructions in a time frame. For example I want to call a function that will change my variable in 50 seconds. I have searched but I saw that I need to ...
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0 answers
29 views

How long does it take an experienced developer to deploy a simple auction smart contract with front end?

I'm currently vetting eth devs for a nifty personal platform but I'm not a developerand don't have much of a concept for the complexity for time involved for Solidity development. Ballpark estimates ...
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0 answers
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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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1 vote
1 answer
2k 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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1 answer
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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 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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1 vote
1 answer
531 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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2 answers
1k 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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34 votes
5 answers
20k 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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1 vote
1 answer
109 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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3 votes
1 answer
692 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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1 answer
72 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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1 answer
921 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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3 votes
3 answers
2k 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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3 votes
1 answer
788 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(...
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