I am new to APEX, but keep seeing 50 different ways to achieve this, so hoping I can get some Guidance. 

On my lead and opportunity objects I have a custom field called "Dialer Daily". Every time a call is made I am using a workflow to increase that counter field. Every day I need to reset the field "Dialer Daily" to 0 every day. There are no other restrictions or requirements, just need to set that field to 0 on ALL Lead and Opportunity objects. I appreciate the help in Advance!