diff --git a/meshinfo/config.py b/meshinfo/config.py
index 1f7b0df..081658c 100644
--- a/meshinfo/config.py
+++ b/meshinfo/config.py
@@ -152,7 +152,7 @@ def configure(
     filters = settings.setdefault("jinja2.filters", {})
     filters.setdefault("duration", "meshinfo.filters.duration")
     filters.setdefault("in_tz", "meshinfo.filters.in_tz")
-    filters.setdefault("local_tz", "meshinfo.filters.local_tz")
+    filters.setdefault("client_tz", "meshinfo.filters.client_tz")
 
     if app_config.env == Environment.DEV:
         settings["pyramid.reload_all"] = True
@@ -185,23 +185,20 @@ def configure(
     if app_config.env == Environment.DEV:
         config.include("pyramid_debugtoolbar")
 
-    server_timezone = pendulum.tz.local_timezone()
-
     def client_timezone(request):
-        if "local_tz" in request.cookies:
-            try:
-                client_tz = pendulum.timezone(request.cookies["local_tz"])
-            except Exception as exc:
-                # TODO: identify client?
-                logger.warning(
-                    "Invalid timezone specified: {} ({!r})",
-                    request.cookies["local_tz"],
-                    exc,
-                )
-                client_tz = server_timezone
-            return client_tz.name
-        else:
-            return server_timezone.name
+        if "client_tz" not in request.cookies:
+            return pendulum.timezone("UTC")
+        try:
+            client_tz = pendulum.timezone(request.cookies["client_tz"])
+        except Exception as exc:
+            # TODO: identify client?
+            logger.warning(
+                "Invalid timezone specified: {} ({!r})",
+                request.cookies["client_tz"],
+                exc,
+            )
+            client_tz = pendulum.timezone("UTC")
+        return client_tz
 
     config.add_request_method(lambda r: client_timezone(r), "timezone", reify=True)
 
diff --git a/meshinfo/filters.py b/meshinfo/filters.py
index 7cd5687..efc57f2 100644
--- a/meshinfo/filters.py
+++ b/meshinfo/filters.py
@@ -18,6 +18,6 @@ def in_tz(dt, tz="utc"):
 
 
 @jinja2.pass_context
-def local_tz(ctx, dt):
+def client_tz(ctx, dt):
     request = ctx.get("request") or get_current_request()
     return dt.in_tz(request.timezone).format("YYYY-MM-DD HH:mm:ss zz")
diff --git a/meshinfo/historical.py b/meshinfo/historical.py
index 3cf6d18..b100185 100644
--- a/meshinfo/historical.py
+++ b/meshinfo/historical.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import enum
+import os
 from itertools import cycle
 from pathlib import Path
 from typing import Any, Iterable, List, Optional
@@ -132,6 +133,7 @@ def graph_network_stats(
         self,
         *,
         params: GraphParams,
+        timezone: str,
     ) -> bytes:
         """Graph network poller statistics."""
         rrd_file = self._network_filename()
@@ -150,9 +152,9 @@ def graph_network_stats(
                 legend=ds.replace("_count", "s"),
             )
 
-        return graph.render()
+        return graph.render(timezone=timezone)
 
-    def graph_poller_stats(self, *, params: GraphParams) -> bytes:
+    def graph_poller_stats(self, *, params: GraphParams, timezone: str) -> bytes:
         """Graph network info."""
         rrd_file = self._network_filename()
         colors = cycle(COLORS)
@@ -170,13 +172,14 @@ def graph_poller_stats(self, *, params: GraphParams) -> bytes:
                 style="LINE1",
                 legend=ds.replace("_time", ""),
             )
-        return graph.render()
+        return graph.render(timezone=timezone)
 
     def graph_node_uptime(
         self,
         node: Node,
         *,
         params: GraphParams,
+        timezone: str,
     ) -> bytes:
         """Graph node uptime."""
         rrd_file = self._node_filename(node)
@@ -193,13 +196,14 @@ def graph_node_uptime(
             style="AREA",
             legend="uptime",
         )
-        return graph.render()
+        return graph.render(timezone=timezone)
 
     def graph_node_load(
         self,
         node: Node,
         *,
         params: GraphParams,
+        timezone: str,
     ) -> bytes:
         """Graph node uptime."""
         rrd_file = self._node_filename(node)
@@ -216,13 +220,14 @@ def graph_node_load(
             style="LINE1",
             legend="load",
         )
-        return graph.render()
+        return graph.render(timezone=timezone)
 
     def graph_node_links(
         self,
         node: Node,
         *,
         params: GraphParams,
+        timezone: str,
     ) -> bytes:
         """Graph node links."""
         rrd_file = self._node_filename(node)
@@ -256,13 +261,14 @@ def graph_node_links(
             style="LINE1",
         )
 
-        return graph.render()
+        return graph.render(timezone=timezone)
 
     def graph_link_cost(
         self,
         link: Link,
         *,
         params: GraphParams,
+        timezone: str,
     ) -> bytes:
         """Graph link routing cost."""
 
@@ -278,13 +284,14 @@ def graph_link_cost(
             style="LINE1",
             legend="route cost",
         )
-        return graph.render()
+        return graph.render(timezone=timezone)
 
     def graph_link_snr(
         self,
         link: Link,
         *,
         params: GraphParams,
+        timezone: str,
     ) -> bytes:
         """Graph node uptime."""
         # TODO: add a black line at 0 so it stands out
@@ -316,13 +323,14 @@ def graph_link_snr(
             style="LINE1",
             legend="noise",
         )
-        return graph.render()
+        return graph.render(timezone=timezone)
 
     def graph_link_quality(
         self,
         link: Link,
         *,
         params: GraphParams,
+        timezone: str,
     ) -> bytes:
         """Graph link quality and neighbor quality."""
 
@@ -347,7 +355,7 @@ def graph_link_quality(
             style="LINE1",
             legend="neighbor",
         )
-        return graph.render()
+        return graph.render(timezone=timezone)
 
     def update_link_stats(self, link: Link) -> bool:
         # switch to async after testing!
@@ -590,8 +598,8 @@ def add_summarized_ds(
         )
         self.elements[-1] += r"\l"
 
-    def render(self) -> bytes:
-        """Draw the graph via RRDtool."""
+    def render(self, *, timezone: str) -> bytes:
+        """Draw the graph via RRDtool in a particular timezone."""
 
         self.options.extend(("--start", self.start))
         if self.end:
@@ -616,5 +624,11 @@ def render(self) -> bytes:
         )
         logger.trace("Rendering graph: {}", graphv_args)
 
+        current_timezone = os.getenv("TZ")
+        os.environ["TZ"] = timezone
         graph_info = rrdtool.graphv(*graphv_args)
+        if current_timezone is None:
+            del os.environ["TZ"]
+        else:
+            os.environ["TZ"] = current_timezone
         return graph_info["image"]
diff --git a/meshinfo/templates/home.jinja2 b/meshinfo/templates/home.jinja2
index 0a53629..5279450 100644
--- a/meshinfo/templates/home.jinja2
+++ b/meshinfo/templates/home.jinja2
@@ -18,7 +18,7 @@
     <div class="column is-narrow">
       <div class="mb-2">
         <div class="heading">Last Ran</div>
-        <div>{{ last_run.started_at|local_tz }}</div>
+        <div>{{ last_run.started_at|client_tz }}</div>
       </div>
       <div class="mb-2">
         <div class="heading">Polling Time</div>
diff --git a/meshinfo/templates/network-errors.jinja2 b/meshinfo/templates/network-errors.jinja2
index f8d816f..d68a899 100644
--- a/meshinfo/templates/network-errors.jinja2
+++ b/meshinfo/templates/network-errors.jinja2
@@ -4,17 +4,17 @@
 
 {% block content %}
 <div class="container is-fluid">
-  <h1 class="title">Node Polling Errors at {{ stats.started_at|local_tz }}</h1>
+  <h1 class="title">Node Polling Errors at {{ stats.started_at|client_tz }}</h1>
   <div class="content">
     <div class="columns container">
       <div class="column">
         <div class="mb-2">
           <div class="heading">Started At</div>
-          <div>{{ stats.started_at|local_tz }}</div>
+          <div>{{ stats.started_at|client_tz }}</div>
         </div>
         <div class="mb-2">
           <div class="heading">Finished At</div>
-          <div>{{ stats.finished_at|local_tz }}</div>
+          <div>{{ stats.finished_at|client_tz }}</div>
         </div>
       </div>
       <div class="column">
diff --git a/meshinfo/templates/node-details.jinja2 b/meshinfo/templates/node-details.jinja2
index 41b6cd3..6289a42 100644
--- a/meshinfo/templates/node-details.jinja2
+++ b/meshinfo/templates/node-details.jinja2
@@ -38,7 +38,7 @@
       </div>
       <div class="mb-2">
         <div class="heading">Last Seen</div>
-        <div>{{ node.last_seen|local_tz }}</div>
+        <div>{{ node.last_seen|client_tz }}</div>
       </div>
       <div class="mb-2">
         <a href="http://{{ node.name }}.local.mesh:8080" target="_blank" rel="noopener noreferrer">AREDN Page</a>
@@ -153,7 +153,7 @@
           </div>
           <div class="mb-2">
             <div class="heading">Last Seen</div>
-            <div>{{ link.last_seen|local_tz }}</div>
+            <div>{{ link.last_seen|client_tz }}</div>
           </div>
         </div>
         <div class="column is-narrow">
diff --git a/meshinfo/templates/nodes.jinja2 b/meshinfo/templates/nodes.jinja2
index 3c69016..ce32962 100644
--- a/meshinfo/templates/nodes.jinja2
+++ b/meshinfo/templates/nodes.jinja2
@@ -87,7 +87,7 @@
             '{{ node.active_tunnel_count }}',
             '{{ node.firmware_version }}',
             '{{ node.up_time }}',
-            '{{ node.last_seen|local_tz }}'
+            '{{ node.last_seen|client_tz }}'
           ]{% if not loop.last %},{% endif %}
         {% endfor %}
       ],
diff --git a/meshinfo/views/link.py b/meshinfo/views/link.py
index 5baae50..040f7aa 100644
--- a/meshinfo/views/link.py
+++ b/meshinfo/views/link.py
@@ -105,6 +105,7 @@ def __init__(self, request: Request):
         self.graph_params = schema.graph_params(request.GET)
 
         self.stats: HistoricalStats = request.find_service(HistoricalStats)
+        self.timezone: str = request.timezone.name
 
     @view_config(match_param="name=cost")
     def cost_graph(self):
@@ -114,8 +115,11 @@ def cost_graph(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
+        graph_data = self.stats.graph_link_cost(
+            self.link, params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_link_cost(self.link, params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )
@@ -128,8 +132,11 @@ def snr_graph(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
+        graph_data = self.stats.graph_link_snr(
+            self.link, params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_link_snr(self.link, params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )
@@ -142,8 +149,11 @@ def quality_graph(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
+        graph_data = self.stats.graph_link_quality(
+            self.link, params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_link_quality(self.link, params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )
diff --git a/meshinfo/views/network.py b/meshinfo/views/network.py
index 6e0b15f..ac46e6d 100644
--- a/meshinfo/views/network.py
+++ b/meshinfo/views/network.py
@@ -27,6 +27,7 @@ class NetworkGraphs:
     def __init__(self, request: Request):
         self.graph_params = schema.graph_params(request.GET)
         self.stats: HistoricalStats = request.find_service(HistoricalStats)
+        self.timezone: str = request.timezone.name
 
     @view_config(match_param="name=info")
     def info(self):
@@ -35,9 +36,11 @@ def info(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
-
+        graph_data = self.stats.graph_network_stats(
+            params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_network_stats(params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )
@@ -49,9 +52,11 @@ def poller(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
-
+        graph_data = self.stats.graph_poller_stats(
+            params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_poller_stats(params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )
diff --git a/meshinfo/views/node.py b/meshinfo/views/node.py
index 2ae26f3..e91de18 100644
--- a/meshinfo/views/node.py
+++ b/meshinfo/views/node.py
@@ -126,6 +126,7 @@ def __init__(self, request: Request):
         self.name_in_title = asbool(request.GET.get("name_in_title", False))
 
         self.stats: HistoricalStats = request.find_service(HistoricalStats)
+        self.timezone: str = request.timezone.name
 
     @view_config(match_param="name=links")
     def links(self):
@@ -135,8 +136,11 @@ def links(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
+        graph_data = self.stats.graph_node_links(
+            self.node, params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_node_links(self.node, params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )
@@ -149,8 +153,11 @@ def load(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
+        graph_data = self.stats.graph_node_load(
+            self.node, params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_node_load(self.node, params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )
@@ -163,8 +170,11 @@ def uptime(self):
             self.graph_params.title,
         )
         self.graph_params.title = " - ".join(part for part in title_parts if part)
+        graph_data = self.stats.graph_node_uptime(
+            self.node, params=self.graph_params, timezone=self.timezone
+        )
         return Response(
-            self.stats.graph_node_uptime(self.node, params=self.graph_params),
+            graph_data,
             status="200 OK",
             content_type="image/png",
         )