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Questions related to the timestamp value of a block, or the use of Ethereum in timestamping.
22
votes
Accepted
How do you work with Date and time on Ethereum platform
The block includes a timestamp (in seconds since 1970), which your contract code can refer to by the name block.timestamp. … The timestamp is set by the miner who mines the block and nobody can be sure at what time they really mined it, so it may not be exactly accurate. …
4
votes
How time difference can be calculated by block.number and how it is different from block.tim...
The timestamp can be easily gamed over short intervals. … If the time period is long, and your goal is security rather than feeling like you're living in a science fiction novel, use a timestamp. …
5
votes
How to do a contract with expire time?
See this discussion on how much you should worry about miner manipulation: Solidity: Timestamp dependency, is it possible to do safely? …
17
votes
Accepted
Is Solidity block.number more secure than timestamp?
The block number will always be correct by definition: It's number x in the chain, because it's chained on top of x-1.
However, as you say block.timestamp can be gamed a little bit - or with the coop …