Open WeChat and click the "I" button in the lower right corner.
In the Me window, continue to click the Settings option.
In the settings page, slide down, find the "Accounts and Security" option, and then click it.
In the "Account and Security" option, find the "Login Device Management" option, and click "View Details" on the right.
On the "Login Device Management" page, you can see the device information of the first login of WeChat account, including the login time.
If there is no login device management option, you can find "login record" on the account and security page, click View Login Record, and you can also see the login time and login device information of WeChat account.
Please note that the above steps may be different depending on the version of WeChat or operating system. Please refer to the actual situation for specific operations.