diff --git a/app/js/custom.js b/app/js/custom.js
index d09a0b6..f1f185c 100644
--- a/app/js/custom.js
+++ b/app/js/custom.js
@@ -1,11 +1,14 @@
 // JavaScript Document
 
-// retrieve phone number and guarantee modal content from REST API
+var today, starttime, endtime;
+
+// retrieve phone number, office hours, and guarantee modal content from REST API
 $.ajax({
   url: "https://www.algaecal.com/wp-json/acf/v3/options/options",
   dataType: "text",
   success:function(data){
 	  var optiondata = JSON.parse(data);
+	  
 	  var phonenum = optiondata.acf.default_phone_number;
 	  var guarantee = optiondata.acf["7yr_full_copy"];
 	  var officehours = optiondata.acf.office_hours;
@@ -14,7 +17,7 @@ $.ajax({
 	  
 	  $(".modal-body").html(guarantee);
 	  
-	  var today = new Date();
+	  today = new Date();
 	  
 	  var starthour = parseInt(parseInt(officehours[today.getDay()].starting_time)/100);
 	  var startmin = starthour*100 - parseInt(officehours[today.getDay()].starting_time);
@@ -22,14 +25,37 @@ $.ajax({
 	  var endhour = parseInt(parseInt(officehours[today.getDay()].closing_time)/100);
 	  var endmin = endhour*100 - parseInt(officehours[today.getDay()].closing_time);
 	  
-	  var starttime = new Date(today.getFullYear(),today.getMonth(),today.getDate(),starthour,startmin,0,0);
-	  var endtime = new Date(today.getFullYear(),today.getMonth(),today.getDate(),endhour,endmin,0,0);
+	  starttime = new Date(today.getFullYear(),today.getMonth(),today.getDate(),starthour,startmin,0,0);
+	  
+	  endtime = new Date(today.getFullYear(),today.getMonth(),today.getDate(),endhour,endmin,0,0);
 	  
-	  if(today.getTime() >= starttime.getTime() && today.getTime() <= endtime.getTime()){
-		  // show "speak to our bone health specialists message"
-		  $(".speak-msg").show();
-	  }
+	  // calculate offset for timezones (PST or PDT) to ensure that AlgaeCal is actually open (using Vancouver, B.C.)
 	  
+	  var tzurl = "https://maps.googleapis.com/maps/api/timezone/json?location=49.246670,-123.094729&timestamp=" + parseInt(today.getTime()/1000) + "&key=AIzaSyACPIqxYiiRjBvsB7uXPST6vFibTXPHKZs";
+	  
+	  $.ajax({
+		  url: tzurl,
+		  dataType: "text",
+		  success:function(tzdata){
+			  
+			  var timezonedata = JSON.parse(tzdata);
+			  
+			  // subtract offsets to get GMT of start and end times of office hours and convert to milliseconds:
+			  var chkstarttime = starttime.getTime() - timezonedata.dstOffset*1000 - timezonedata.rawOffset*1000;
+			  var chkendtime = endtime.getTime() - timezonedata.dstOffset*1000 - timezonedata.rawOffset*1000;
+
+			  // get offset for current local time and convert to milliseconds
+			  var tz = today.toString().split("GMT")[1].split(" (")[0];
+			  var chktoday = today.getTime() - parseInt(tz)/100*60*60*1000;
+			  
+			  // check if current time is truly during open office hours:
+			  if(chktoday >= chkstarttime && chktoday <= chkendtime){
+				  // show "speak to our bone health specialists message"
+				  $(".speak-msg").show();
+			  }
+		  }
+	  });
+	  	  
   }
 });