4

I know how to pass the current Unix time from the frontend:

web3.js:

anchor.web3.SYSVAR_CLOCK_PUBKEY

Rust:

let current_time = ctx.accounts.clock.unix_timestamp;

I do not want that. I need the smart contract itself to get the current time.

4 Answers 4

5

I'm assuming you're using anchor

let now_ts = Clock::get().unwrap().unix_timestamp;

You will need to pass in the system program account

0
2

Is this what you mean when you say "smart contract itself to get the current time"?

#[program]
mod hello_anchor {
    use super::*;
    pub fn initialize(ctx: Context<Initialize>) -> Result<()> {
        let clock = Clock::get().unwrap();
        msg!("Timestamp: {}!", clock.unix_timestamp); // Message will show up in the tx logs
        Ok(())
    }
}

#[derive(Accounts)]
pub struct Initialize {}

The program log will look like this

enter image description here

1

What you have above is how the smart contract "itself" gets the current time.

When you add anchor.web3.SYSVAR_CLOCK_PUBKEY to your accounts, you're not passing in time from the frontend. You're simply specifying the public key of a system account that stores a cluster of on-chain data relating to time on Solana.

That account is verified by theclock: Sysvar<Clock, 'info> line in your validator and is the authority on handling time in Solana.

0
// pass this to Context
#[derive(Accounts)]
pub struct CreatePost<'info> {
    // add other properties
    pub post: Account<'info, PostAccount>,
    // Clock to save time of post
    pub clock: Sysvar<'info, Clock>,
}

PostAccount struct:

#[account]
pub struct PostAccount {
    // add other properties

    // post time
    pub post_time: i64,
}

Define function in mod

pub fn create_post(ctx: Context<CreatePost>) -> ProgramResult {
     let post = &mut ctx.accounts.post;
     // get the timestamp of post
     post.post_time = ctx.accounts.clock.unix_timestamp;

 }   

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