Questions tagged [time]
The time tag has no usage guidance.
26
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How to work with block timestamps in ethers and hardhat?
I have a time-dependent contract that has two require statements
function launch(uint256 _goal, uint32 _startAt, uint32 _endAt) external {
require(_startAt >= block.timestamp, "...
- 89
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2
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38
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Don't understand why this overflows revert
I have a timelock on an ERC20 contract, from year 0 to 9, it works until year 4, but from year 5 onwards it reverts. It fails both on minting and checking (Using 52 seconds intead of weeks for testing)...
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236
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timeout error while writing staging test on Goerli
Im stuck in this wierd error.
so the thing is when I first tried to deploy the contract on goerli it deployed and verified correctly on etherscan. but after that when I tried to run my staging test it ...
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9
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How to build a calendar to borrow and lend objects
I want to build a Smart Contract that can let a user borrow items lended by another user. I've got some problems with the calendar design though. How can I create/design a calendar that checks if the ...
- 211
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timeintervals in Solidity [duplicate]
Is there a way to do something at each time interval in solidity without having to write and sign a transaction (paying gas) each time the interval passed.
For example. Say I have a glass of eWater on ...
- 965
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12
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How to work with Aion to self-execute contracts
I am trying to self-execute a function within a smart contract using Aion to track defaults, but the transaction fails when I run it on the ropsten test network on remix.
This is my code:
pragma ...
- 67
2
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2
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94
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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 ...
- 23
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249
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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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116
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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 ...
- 125
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2
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351
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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....
- 41
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78
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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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530
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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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137
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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{
...
- 31
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115
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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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129
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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 ...
- 105
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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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49
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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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1
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842
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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 ...
- 1,451
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2
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2k
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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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6
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33k
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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.
- 16k
1
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1
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215
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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?
- 17.2k
4
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2
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937
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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?
- 16k
0
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1
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91
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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 ...
- 16k
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1
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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 ...
- 778
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4
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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/...
- 16k
3
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1
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899
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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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