block start at

api/src/state/block.rs

@@ -22,6 +22,9 @@ pub struct Block {
     /// The authority of the miner who submitted the best hash.
     pub best_hash_miner: Pubkey,
 
+    /// The timestamp at which the block starts mining.
+    pub start_at: i64,
+
     /// The slot at which the block starts trading.
     pub start_slot: u64,
 

program/src/reset.rs

@@ -106,6 +106,7 @@ pub fn process_reset(accounts: &[AccountInfo<'_>], _data: &[u8]) -> ProgramResul
     market.fee.cumulative = 0;
 
     // Setup the next block start and end slots.
+    block_next.start_at = clock.unix_timestamp;
     block_next.start_slot = clock.slot;
     block_next.end_slot = clock.slot + config.block_duration;
 

program/src/swap.rs

@@ -197,6 +197,7 @@ fn test_sniper_fees() {
         reward: 0,
         best_hash: [0; 32],
         best_hash_miner: Pubkey::default(),
+        start_at: 0,
         start_slot: 0,
         end_slot: u64::MAX,
         slot_hash: [0; 32],