Hi I have two custom fields subscription_start_date and subscription_end_date on Opportunity object

Have a two custom checkbox customer1 and customer2 on Contact Object (These two checkboxes are checked from another workflow)

I have a requirement to that these checkboxes should be unchecked if today date does not lies between subscription_start_date and subscription_end_date

No i have to write a trigger with the condition

if (today date should be greater than or equal to subscription_start_date) and (lesser than or equal to subscription_end_date) and (customer1 checkbox should be checked)

{customer1=true }//should be checked

else 

{customer1=false}//should not be checked

The following is my trigger but does not gives expected result 

what is wrong 

trigger checkthecheckbox on Contact (before insert) {

Set<id> oppids = new set<id>();

for (Contact opp: Trigger.new)
{
 oppids.add(opp.id);
}

Map<id, opportunity> oppMap = new Map<id, opportunity>();
for(opportunity o : [select Subscription_Start_Date__c,Subscription_End_Date__c from opportunity where id in: oppids])
{
 
oppMap.put(o.id, o); 
}

for (Contact opp: Trigger.new)
{
if(oppMap.get(opp.Id).Subscription_Start_Date__c>=date.Today())
{
opp.Customer_of_PubKCyber__c=False;
}
 
}
}