What is the Txn date on a bank statement?

Excuse me, could you please clarify what exactly the "Txn date" on a bank statement represents? I'm a bit confused as to what it signifies and how it differs from other dates that might be listed on the statement, such as the posting date or the clearing date. Understanding this would help me better interpret my financial transactions and keep track of my spending habits. Thank you in advance for your assistance.