Questions tagged [timestamp]

Questions related to the timestamp value of a block, or the use of Ethereum in timestamping.

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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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best way to get transaction timestamps?

I'm building an analytics app that tracks transactions on Ethereum and wondering how to get the most accurate timestamp for each transaction. Using the web3.js library I'm able to see the following ...
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auto call function after specific time limit [duplicate]

I want to run a solidity function in my contract to automatically call/execute after 21 days. How can I do that? I am not able to find any specific resource to execute this thing. It would be awesome ...
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35 views

What is the proper way to store timestamp in blockchain?

I am trying to store the timestamp in the blockchain using block.timestamp or now. But that keeps throwing warning as Use of "block.timestamp": "block.timestamp" can be influenced ...
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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?
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How does Etherscan compute mining times?

Etherscan identifies the miner that mined a block and the corresponding mining time. How does Etherscan compute the mining time? It seems that the mining time of a block is not the difference between ...
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How could I measure the total delay (time) to confirm the transaction?

First of all, I'm new to the Erthereum world, I need some help in measuring the total delay (time) require for confirming the transaction. I have a decentralized application over a Rinkeby network, ...
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1answer
45 views

How to Calculate How Long an Address Has Held A Token? (for paying interest/rewards)

I'm writing a smart contract function that rewards users some rate of interest/reward for holding my stablecoin over owning competitors (Dai, Tether, etc). What is the most efficient manner to ...
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Unit testing time sensitive Provable smart contracts

I'm currently using Provable (formerly Oraclize) to make a CRON job : constructor() public payable { OAR = OracleAddrResolverI(0x6F486C8BD6fc43eA212E93CCF8ce047C7f1Cb475); provable_query(7 ...
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1answer
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How to get block size and block mining time while using ganache and truffle

I am using truffle framework and Ganache (GUI) as emulator. I want to know the size of the generated block. Also I want to know the time required to mine/generate/create a block after the command. I ...
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1answer
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Block.timestamp returning multiple values

I have a function inside my smart contract that fetches the timestamp of the block it's in: function getTime() public returns (uint256 time){ return block.timestamp;; } According to how I ...
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Gas Estimation Failed error when scheduling Aion call

I am trying to understand the Aion scheduling system, so I tried their code example from here. Below is the code snippet: pragma solidity ^0.4.24; // interface Aion contract Aion { uint256 ...
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Do something when epoch time is [duplicate]

This is my struct where I have: timeBeforeRenew. The idea is that, if a customer does not deposit x amount of token before the time expires, his address then automatically sends all the tokens ...
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In web3, how can I fetch a range of block timestamps most efficiently?

Given a range of block numbers, how can I most efficiently fetch the timestamps for those blocks? I couldn't find a simple call to fetch the timestamp at a certain height other than fetching the full ...
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Solidity: Is there any way to store the start time of solidity code? now() function returns block.timestamp only

I wanted to get a start time of solidity code, so I used now() previous which only returns block.timestamp whenever the solidity got started. Is there any way to store or know the start time of ...
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1answer
72 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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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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How to check state of the contract after some time?

I am writing a contract where I need to check that if in 5 minutes no new token get purchased then the sale should be ended. What I mean exactly is that, lets say user A has purchased 100 tokens and ...
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3answers
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How to get the actual time of occurrence for ethereum transaction in block

I used the API of Ethereum to download some transactions info. The timestamp is included, however I found the timestamp not mean the transaction time but the block which this transaction is located ...
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1answer
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Conversion from calendar format into timestamp format

I see a lot of discussion about date and time, timestamp... But they don't answer to my question: How can i convert from calendar format into timestamp format for comparing datetime? e.g: I have this ...
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1answer
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Are the timestamps of blocks for Ethereum only accepted when they are monotonically increasing?

Are the timestamps of blocks for Ethereum only accepted when they are monotonically increasing? If yes, why? And why other blockchains like Bitcoin and other blockchains with shorter block time can ...
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How to define non-exploitability in the difficulty update algorithm?

In enter link description here, it is said that "We have already determined that our current algorithm is highly suboptimal on low volatility and non-exploitability, and at the very least we plan to ...
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Why creating a block that has slightly higher difficulty can beat out any possible forks?

It is said that "The use of (block_timestamp - parent_timestamp) // 10 (* now 9)as the main input variable rather than the time difference directly serves to maintain the coarse-grained nature of the ...
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How can I use bitcoin block stamp as seed for random number generation?

I am trying to create an ethereum based smart contract that shall generate random number. After searching around, I get to know that ethereum block stamp is vulnerable to miners hacks and false ...
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Can I rely on certain oracle to know the precise and reliable timestamp?

I am learning the security impact of smart contract on system properties like block.timestamp and block.number. I understood that block.timestamp can be controlled by the miner to certain degree and ...
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2answers
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Understanding ganache timestamps

Sometimes, when I use the ganache specific evm_increaseTime method and advance to the next block, the next timestamp is NOT: current timestamp + advanced time But instead: current timestamp + ...
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Decentralized Time server to get time in Dapps? [closed]

So basically i want to ask that how can we programmatically get the accurate, exact and current time in a DApp, without relying on the system's time or a centralized time server ? Is there a ...
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1answer
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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 ...
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1answer
147 views

Timestamp in Ethereum

I have a smart contract where the user inputs temperature readings, I'd like to add a time stamp to relate those reading with a current time of submission. I understand that in Ethereum we only have ...
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1answer
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How can I wait if it's not possible in smart contracts? [duplicate]

From my understanding, waiting in a solidity smart contract would create a total disaster for the whole Ethereum's blockchain. I can see in some circumstances that solidity offers block.timestamp ...
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1answer
48 views

Are block timestamps decentralized?

One thing I don't understand about the Ethereum protocol is how timestamps work. If I, as miner, have a reason to fiddle with timestamps (such as adding a few minutes to decrease the mining difficulty)...
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1answer
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Is “now” UTC time in Solidity?

The now keyword in Solidity returns a uint256 with the current block timestamp. Is the timestamp in UTC time? (ie. the number of seconds since 1st January 1970)
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Understand the potential issue of miner controlled gaslimit

I am aware that smart contracts running on top of EVM can access certain system properties such as timestamp, block number, and gas limit. I am also aware that such properties can be controlled by ...
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1answer
194 views

How long does an ether transaction take until verification (and where do I get this data?)

I am wondering if data is stored in the ETH blockchain on the time the transaction got send to the mempool such that I can deduce the time until it got included in a public afterwards (not to be ...
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1answer
245 views

How can i implement deadlines in smartContract?

Suppose I am running a gallery and ask participants to submit there paintings before a specific date. After passing that date participant should not be able to submit their entry. How can I implement ...
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1answer
237 views

Ethereum extract transactions based on timestamp

I am trying to extract all transactions of Ethereum using the eth scan API. But I need transactions for specific time periods only. I tried running the API for all the blocks to try and extract all ...
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1answer
270 views

Ethereum transactions timestamp

Is it possible to extract individual timestamps of the transactions' execution time in a given block? The Ether-scan API gives only the timestamps of the block collation, doesn't mention anything ...
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1answer
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Is there any protection in the Ethereum consensus or network protocol to avoid a block being mined with a timestamp 1000 years ahead of UTC time? [duplicate]

Will other nodes refuse the mined block if the timestamp is too far apart from local or UTC timestamp or will they blindely accept the block if the PoW is correct?
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time order when calling functions of smart contract

How can I check that the miner actually execute the right order of smart contracts function calls, if there is a necessity of orders?
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1answer
189 views

Unable to schedule a call using Aion Recurring Contract

So here's the contract that I deployed on Ropsten Network. I took code refer from here. pragma solidity ^0.4.24; // interface Aion contract Aion { uint256 public serviceFee; function ...
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2answers
219 views

Can we assume that Ethereum Events (aka Logs) are in-sequence

Lets consider a simple Contract that is to track a variable. A client App needs to access this variable's history to show a graph. I can create an Array inside the Contract, and push() the value ...
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1answer
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How to allow the owner of a contract to set a deadline in days (and not have it inserted as seconds) in the constructor?

thanks for taking the time to read this. I'm having a bit of trouble handling time in Solidity. I want the owner of a contract to be able to set a deadline in days (which will be used in the rest of ...
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2answers
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Solidity can't modify block.timestamp due to lvalue xpression

I have a problem regarding modifying block.timestamp. I would like to modify timestamp in my network and change block.timestamp to unix timestamp, but I got an error at modification: TypeError: ...
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1answer
134 views

How can I increase EVM time in web3.py?

When working with web3.js, Truffle and Ganache, I can do this: web3.currentProvider.send({method: "evm_increaseTime", params: [numOfSeconds]}); How can I do the equivalent in web3.py? When I do: ...
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How to get multiple blocks timestamps with a single JSON RPC call?

Is there a way to get data similar to the ones provided by web3.eth.getBlock(blockNumber) but with multiple blocks at once? The goal is to get the timestamps for 100 blocks in a row without ...
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1answer
332 views

crypto-signing in a smart contract -> verify the identity of a smart contract

my Question in short is: -> is it possible to digitally sign some data by a smart contract (e.g. with a secret key of the contract) and thus confirm that it was exactly this smart contract, who ...
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325 views

How to map multiple time and index value on same address

I wish to map the time to the address key. But currently it is working on the index key only. I just want to map time as well. Means the current time. So that I can able to get the record with time as ...
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1answer
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I want a function locked for a certain amount of time, what's the safest way to achieve this?

I want a store where someone can become tokenOwner for a certain amount of time. The following solutions seems the easiest: pragma solidity ^0.4.24; import "../node_modules/zeppelin-solidity/...
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285 views

Why time values should be used as uint256?

Is there a reason to use the time value as uint256? Is not uint128 enough? UnixTime...
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1answer
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Setting time requirements in Solidity

I want a function to only be able to be called after a certain specific period of time has passed from the contract's inception. Generally, I was using block.number for that. As in: require(block....