diff --git a/README.md b/README.md
index 66ffafc..38ca1cc 100644
--- a/README.md
+++ b/README.md
@@ -403,8 +403,9 @@ uoftscrapers.Exams
   "course_code": String
   "period": String,
   "date": String,
-  "start_time": String,
-  "end_time": String,
+  "start_time": Number,
+  "end_time": Number,
+  "duration": Number,
   "sections": [{
     "lecture_code": String,
     "exam_section": String,
diff --git a/uoftscrapers/scrapers/exams/utm.py b/uoftscrapers/scrapers/exams/utm.py
index 7fc9c0b..3d1684f 100644
--- a/uoftscrapers/scrapers/exams/utm.py
+++ b/uoftscrapers/scrapers/exams/utm.py
@@ -65,6 +65,7 @@ def retrieve_exams(courses):
 
             start, end = UTMExams.parse_time(data[1].split(': ')[1],
                                              data[2].split(': ')[1], date)
+            duration = end - start
 
             sections = [UTMExams.parse_sections(room.split(': ')[1])
                         for room in [x for x in data[3:] if 'Room:' in x]]
@@ -82,6 +83,7 @@ def retrieve_exams(courses):
                 ('date', date),
                 ('start_time', start),
                 ('end_time', end),
+                ('duration', duration),
                 ('sections', [])
             ])
 
@@ -176,8 +178,5 @@ def parse_sections(room):
     def parse_time(start, end, date):
         def convert_time(t):
             h, m, s = [int(x) for x in t.split(':')]
-            dt = datetime.strptime('%s %s %s %s' % (date, h, m, s),
-                                   '%Y-%m-%d %H %M %S')
-            return timezone('US/Eastern').localize(dt).isoformat()
-
+            return (h * 60 * 60) + (m * 60) + s
         return convert_time(start), convert_time(end)
diff --git a/uoftscrapers/scrapers/exams/utsc.py b/uoftscrapers/scrapers/exams/utsc.py
index d7d4d89..42f35d7 100644
--- a/uoftscrapers/scrapers/exams/utsc.py
+++ b/uoftscrapers/scrapers/exams/utsc.py
@@ -32,6 +32,7 @@ def scrape(location='.'):
 
                 date = data[1]
                 start, end = UTSCExams.parse_time(data[2], data[3], date)
+                duration = end - start
 
                 location_ = data[4]
 
@@ -51,6 +52,7 @@ def scrape(location='.'):
                     ('date', date),
                     ('start_time', start),
                     ('end_time', end),
+                    ('duration', duration),
                     ('sections', [])
                 ])
 
@@ -130,7 +132,5 @@ def get_course_id(course_code, date):
     def parse_time(start, end, date):
         def convert_time(t):
             h, m = [int(x) for x in t.split(':')]
-            dt = datetime.strptime('%s %s %s' % (date, h, m), '%Y-%m-%d %H %M')
-            return timezone('US/Eastern').localize(dt).isoformat()
-
+            return (h * 60 * 60) + (m * 60)
         return convert_time(start), convert_time(end)
diff --git a/uoftscrapers/scrapers/exams/utsg.py b/uoftscrapers/scrapers/exams/utsg.py
index b1ced42..ffa7e1b 100644
--- a/uoftscrapers/scrapers/exams/utsg.py
+++ b/uoftscrapers/scrapers/exams/utsg.py
@@ -65,6 +65,7 @@ def scrape(location='.', year=None):
 
                 date = UTSGExams.parse_date(data[2], p[-2:]) or ''
                 start, end = UTSGExams.parse_time(data[3], date) or (0, 0)
+                duration = end - start
 
                 doc = OrderedDict([
                     ('id', id_),
@@ -75,6 +76,7 @@ def scrape(location='.', year=None):
                     ('date', date),
                     ('start_time', start),
                     ('end_time', end),
+                    ('duration', duration),
                     ('sections', [])
                 ])
 
@@ -141,9 +143,8 @@ def parse_time(time, d):
         def convert_time(t, is_pm=False):
             """Convert time from `HH:MM` to an ISO 8601 datetime."""
             h, m = [int(x) for x in t.split(':')]
-            h += 12 if is_pm else 0
-            dt = datetime.strptime('%s %s %s' % (d, h, m), '%Y-%m-%d %H %M')
-            return timezone('US/Eastern').localize(dt).isoformat()
+            h += 12 if is_pm and h != 12 else 0
+            return (h * 60 * 60) + (m * 60)
 
         time = list(filter(None, time.replace('-', '').split(' ')))
         if len(time) == 3: