Lesson 9: How does "evm_increaseTime" works

[AndrewPrasaath]

Can anyone explain what exactly following two lines do.
I understand "evm_increaseTime" & "evm_mine" used to pretend to be mining new block with fast forwarding time. But I want to understand why exactly we passed "[interval.toNumber() + 1]".

await network.provider.send("evm_increaseTime", [interval.toNumber() + 1])
await network.provider.send("evm_mine", [])

[alymurtazamemon]

@AndrewPrasaath It is a time

[AndrewPrasaath]

yeah ok, but why we adding "+ 1"
what exactly it's doing, kindly explain pls

[rin-st]

In checkUpkeep function you have following line bool timePassed = ((block.timestamp - s_lastTimeStamp) > i_interval); and it should be true to continue execution. So block.timestamp should be more than s_lastTimeStamp + i_interval. These two lines from your question make block.timestamp equal s_lastTimeStamp + i_interval + 1, so it more than s_lastTimeStamp + i_interval