Strict comparison with <code>block.timestamp</code> or <code>now</code>. Miners can affect <code>block.timestamp</code> for their benefits. Thus, one should not rely on the exact value of <code>block.timestamp</code>.
</p>
<p>
Vulnerability type by SmartDec classification: <ahref="https://github.com/smartdec/classification#block-content-manipulation">
require(now >= startTime && now <= startTime + 1 days);
require(now > startTime + 1 days);
}
function ICOisEnd(uint _time) returns(bool) {
return _time > 1000000000;
}
}
```
### Abstract Syntax Tree
[Click Here](https://astexplorer.net/#/gist/59ba17f402eab28f3690de0880781575/91c2e583496ea6c3357e9616dcb9a88a5ec466ff) to view the AST for the above code. Code generated from AST Explorer using _solidity-parser-antlr-0.4.11_