diff --git a/src/libsysprof-analyze/sysprof-document-frame-private.h b/src/libsysprof-analyze/sysprof-document-frame-private.h
index 50326fe9..3755009e 100644
--- a/src/libsysprof-analyze/sysprof-document-frame-private.h
+++ b/src/libsysprof-analyze/sysprof-document-frame-private.h
@@ -34,6 +34,7 @@ struct _SysprofDocumentFrame
   guint32                    frame_len : 16;
   guint32                    needs_swap : 1;
   guint32                    padding : 15;
+  guint32                    time_offset;
 };
 
 struct _SysprofDocumentFrameClass
@@ -44,7 +45,8 @@ struct _SysprofDocumentFrameClass
 SysprofDocumentFrame *_sysprof_document_frame_new (GMappedFile               *mapped,
                                                    const SysprofCaptureFrame *frame,
                                                    guint16                    frame_len,
-                                                   gboolean                   needs_swap);
+                                                   gboolean                   needs_swap,
+                                                   gint64                     clock_at_start);
 
 #define SYSPROF_DOCUMENT_FRAME_ENDPTR(obj) \
   (&((const guint8 *)SYSPROF_DOCUMENT_FRAME(obj)->frame)[SYSPROF_DOCUMENT_FRAME(obj)->frame_len])
diff --git a/src/libsysprof-analyze/sysprof-document-frame.c b/src/libsysprof-analyze/sysprof-document-frame.c
index f52022d5..d7259c5b 100644
--- a/src/libsysprof-analyze/sysprof-document-frame.c
+++ b/src/libsysprof-analyze/sysprof-document-frame.c
@@ -43,6 +43,7 @@ enum {
   PROP_CPU,
   PROP_PID,
   PROP_TIME,
+  PROP_TIME_OFFSET,
   N_PROPS
 };
 
@@ -83,6 +84,10 @@ sysprof_document_frame_get_property (GObject    *object,
       g_value_set_int64 (value, sysprof_document_frame_get_time (self));
       break;
 
+    case PROP_TIME_OFFSET:
+      g_value_set_int64 (value, sysprof_document_frame_get_time_offset (self));
+      break;
+
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     }
@@ -117,6 +122,13 @@ sysprof_document_frame_class_init (SysprofDocumentFrameClass *klass)
                         0,
                         (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 
+  properties[PROP_TIME_OFFSET] =
+    g_param_spec_int64 ("time-offset", NULL, NULL,
+                        G_MININT64,
+                        G_MAXINT64,
+                        0,
+                        (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
   g_object_class_install_properties (object_class, N_PROPS, properties);
 }
 
@@ -129,7 +141,8 @@ SysprofDocumentFrame *
 _sysprof_document_frame_new (GMappedFile               *mapped_file,
                              const SysprofCaptureFrame *frame,
                              guint16                    frame_len,
-                             gboolean                   needs_swap)
+                             gboolean                   needs_swap,
+                             gint64                     begin_time)
 {
   SysprofDocumentFrame *self;
   GType gtype;
@@ -198,6 +211,7 @@ _sysprof_document_frame_new (GMappedFile               *mapped_file,
   self->frame = frame;
   self->frame_len = frame_len;
   self->needs_swap = !!needs_swap;
+  self->time_offset = CLAMP (sysprof_document_frame_get_time (self) - begin_time, 0, G_MAXINT64);
 
   return self;
 }
@@ -225,3 +239,11 @@ sysprof_document_frame_get_time (SysprofDocumentFrame *self)
 
   return SYSPROF_DOCUMENT_FRAME_INT64 (self, self->frame->time);
 }
+
+gint64
+sysprof_document_frame_get_time_offset (SysprofDocumentFrame *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_DOCUMENT_FRAME (self), 0);
+
+  return self->time_offset;
+}
diff --git a/src/libsysprof-analyze/sysprof-document-frame.h b/src/libsysprof-analyze/sysprof-document-frame.h
index 46d98055..c8556fa1 100644
--- a/src/libsysprof-analyze/sysprof-document-frame.h
+++ b/src/libsysprof-analyze/sysprof-document-frame.h
@@ -35,13 +35,15 @@ typedef struct _SysprofDocumentFrame      SysprofDocumentFrame;
 typedef struct _SysprofDocumentFrameClass SysprofDocumentFrameClass;
 
 SYSPROF_AVAILABLE_IN_ALL
-GType  sysprof_document_frame_get_type (void) G_GNUC_CONST;
+GType  sysprof_document_frame_get_type        (void) G_GNUC_CONST;
 SYSPROF_AVAILABLE_IN_ALL
-int    sysprof_document_frame_get_cpu  (SysprofDocumentFrame *self);
+int    sysprof_document_frame_get_cpu         (SysprofDocumentFrame *self);
 SYSPROF_AVAILABLE_IN_ALL
-int    sysprof_document_frame_get_pid  (SysprofDocumentFrame *self);
+int    sysprof_document_frame_get_pid         (SysprofDocumentFrame *self);
 SYSPROF_AVAILABLE_IN_ALL
-gint64 sysprof_document_frame_get_time (SysprofDocumentFrame *self);
+gint64 sysprof_document_frame_get_time        (SysprofDocumentFrame *self);
+SYSPROF_AVAILABLE_IN_ALL
+gint64 sysprof_document_frame_get_time_offset (SysprofDocumentFrame *self);
 
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofDocumentFrame, g_object_unref)
 
diff --git a/src/libsysprof-analyze/sysprof-document.c b/src/libsysprof-analyze/sysprof-document.c
index 47ca0fb2..a18b1134 100644
--- a/src/libsysprof-analyze/sysprof-document.c
+++ b/src/libsysprof-analyze/sysprof-document.c
@@ -118,7 +118,8 @@ sysprof_document_get_item (GListModel *model,
   ret = _sysprof_document_frame_new (self->mapped_file,
                                      (gconstpointer)&self->base[ptr->offset],
                                      ptr->length,
-                                     self->needs_swap);
+                                     self->needs_swap,
+                                     self->header.time);
 
   /* Annotate processes with pre-calculated info */
   if (SYSPROF_IS_DOCUMENT_PROCESS (ret))