User2105670541 posted
you just need to create a sql batch or stored procedure that will contain the update statement of your requirement, now you should create a SQL job, paste your query/stored procedure there in sql job steps. At the end you should schedule your sql job to
your required time which is 31st of Dec 31 at 12.00 AM. your query will only run on that time and will do the required things, if you want you can change the time schedule to run on some interval.
you should not choose web service, because you need to create again a UI or windows service or some scheduled task to call the web service.