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Here is an article about comparing using clock.unix_timestamps and times given by instructions.arg:
Comparing Unix Timestamps in Solidity
When creating surveys or initializing candidates, you need to make sure that they have been started before you can add a candidate. However, if you are having issues with timing, it can be difficult to determine whether the survey was properly initialized.
In this article, we will look at how to compare clock.unix_timestamps and times given by instructions.arg arguments in Solidity.
What is a Unix Timestamp?
A Unix timestamp is a number that represents the number of seconds that have passed since January 1, 1970, 00:00:00 UTC. It can be obtained using the Date.now() function or the unixTimestamp() method on the Date object.
clock.unix_timestamps in Solidity
In Solidity, you can get the current Unix timestamp using the following syntax:
const unixTimestamp = Date.now() / 1000;
This returns an integer representing the number of seconds since January 1, 1970, 00:00:00 UTC.
Comparing Unix Timestamps
You can use the following functions to compare two Unix timestamps:
clock.unix_timestamps( Solidity 0.6.x and later )
const unixTimestamp1 = clock.unix_timestamps();
const unixTimestamp2 = instructions.arg(0).unixTimestamp();
if (unixTimestamp1 < unixTimestamp2) {
// poll started
} else if (unixTimestamp1 > unixTimestamp2) {
// poll did not start properly
} else {
// both polls started at the same time
}
clock.unix_timestamps(0)( Solidity 0.4.x and earlier )
const unixTimestamp1 = clock.unix_timestamps(0);
const unixTimestamp2 = instructions.arg(0).unixTimestamp();
if (unixTimestamp1 < unixTimestamp2) {
// poll started
} else if (unixTimestamp1 > unixTimestamp2) {
// poll didn't start properly
} else {
// both polls started at the same time
}
Using instructions.arg(0).unixTimestamp()
Alternatively, you can use `instructions.arg(0).unixTimestamp()’ to get the Unix timestamp for the instruction that initiated the poll. This is useful when comparing to a fixed time.
For example:
const unixTimestamp1 = instructions.arg(0).unixTimestamp();
const unixTimestamp2 = clock.unix_timestamps();
if (unixTimestamp1 < unixTimestamp2) {
// poll started
} else if (unixTimestamp1 > unixTimestamp2) {
// poll didn't start properly
} else {
// both polls started at the same time
}
Conclusion
To sum up, comparing clock.unix_timestamps and the time given in the arguments to instructions.arg(0).unixTimestamp() is easy in Solidity. You can use one of these functions to ensure that your poll was properly initialized, and initialize candidates if necessary.
I hope this helps! Let me know if you have any more questions or need additional help.
