diff --git a/playbook/blancco-init.sh b/playbook/blancco-init.sh
index 932b8d6..bd2aa84 100644
--- a/playbook/blancco-init.sh
+++ b/playbook/blancco-init.sh
@@ -370,6 +370,13 @@ else
     echo "  (no blancco-progress.py on server: no live progress on the dashboard)"
 fi
 
+# Site timezone for Blancco's own clock (GUI, logs). Report timestamps keep
+# an explicit UTC offset; report.utc_offset in the preferences stays 0
+# because it is a fixed offset and cannot follow daylight saving.
+if [ -e /run/newroot/usr/share/zoneinfo/America/New_York ]; then
+    ln -sf /usr/share/zoneinfo/America/New_York /run/newroot/etc/localtime
+fi
+
 # Debug boots only: Blancco's own debug mode (/etc/debug.environment makes
 # isDebugMode true, so 2_sshd starts sshd) plus an SSH key for root.
 # Root is locked and sshd is key-only, so without the key there is no way
diff --git a/webapp/app.py b/webapp/app.py
index df362c2..72a977b 100644
--- a/webapp/app.py
+++ b/webapp/app.py
@@ -638,7 +638,7 @@ def blancco_export_reports():
         if when < since:
             continue
         rows.extend(blancco_report.export_rows(
-            f, data, when.isoformat(),
+            f, data, to_display_tz(when).isoformat(),
             blancco_evidence.cloud_status(cloud_state, (data.get("meta") or {}).get("document_id", ""))))
         files.append(f)
         pdf = os.path.splitext(f)[0] + ".pdf"
@@ -1490,10 +1490,40 @@ def api_save_unattend(image_type):
 # Template helpers
 # ---------------------------------------------------------------------------
 
+def to_display_tz(value):
+    """datetime (naive = UTC), ISO-8601 string or Unix timestamp -> aware
+    datetime in config.DISPLAY_TZ; None when it cannot be read."""
+    from datetime import timezone
+    from zoneinfo import ZoneInfo
+    if value is None or value == "":
+        return None
+    if isinstance(value, (int, float)):
+        dt = datetime.fromtimestamp(value, timezone.utc)
+    elif isinstance(value, datetime):
+        dt = value if value.tzinfo else value.replace(tzinfo=timezone.utc)
+    else:
+        try:
+            dt = datetime.fromisoformat(str(value).replace("Z", "+00:00"))
+        except ValueError:
+            return None
+        if not dt.tzinfo:
+            dt = dt.replace(tzinfo=timezone.utc)
+    return dt.astimezone(ZoneInfo(config.DISPLAY_TZ))
+
+
+@app.template_filter("local_dt")
+def local_dt(value, seconds=False):
+    """Any timestamp shown in the UI, as e.g. '2026-10-05 13:54 EDT'."""
+    dt = to_display_tz(value)
+    if dt is None:
+        return value or "-"
+    return dt.strftime("%Y-%m-%d %H:%M:%S %Z" if seconds else "%Y-%m-%d %H:%M %Z")
+
+
 @app.template_filter("timestamp_fmt")
 def timestamp_fmt(ts):
-    """Format a Unix timestamp to a human-readable date string."""
-    return datetime.fromtimestamp(ts).strftime("%Y-%m-%d %H:%M")
+    """Format a Unix timestamp in the display timezone."""
+    return local_dt(ts)
 
 
 @app.context_processor
diff --git a/webapp/config.py b/webapp/config.py
index 2685fe6..f234d22 100644
--- a/webapp/config.py
+++ b/webapp/config.py
@@ -25,6 +25,9 @@ IMAGING_DIR = os.environ.get("IMAGING_DIR", "/var/log/pxe-imaging")
 # small JSON state file (cloud-upload confirmations, ServiceNow ticks) kept
 # off the report share so it never shows up as a report.
 BLANCCO_SITE = os.environ.get("BLANCCO_SITE", "West Jefferson")
+# Every time the webapp shows (and evidence-pack month boundaries) is in
+# this zone, DST included. Stored timestamps keep their own UTC offsets.
+DISPLAY_TZ = os.environ.get("DISPLAY_TZ", "America/New_York")
 BLANCCO_STATE = os.environ.get("BLANCCO_STATE", "/var/lib/pxe-webapp/blancco-state.json")
 
 # Log sources used by services/imaging_log_tail.py to infer client progress
diff --git a/webapp/services/blancco_evidence.py b/webapp/services/blancco_evidence.py
index 677f1d6..336707f 100644
--- a/webapp/services/blancco_evidence.py
+++ b/webapp/services/blancco_evidence.py
@@ -130,16 +130,23 @@ def collect(since=None, until=None) -> list[dict]:
     return out
 
 
+def _tz():
+    from zoneinfo import ZoneInfo
+    return ZoneInfo(config.DISPLAY_TZ)
+
+
 def month_bounds(month: str):
-    """'2026-10' -> (2026-10-01T00:00Z, 2026-11-01T00:00Z)."""
+    """'2026-10' -> start of that month and of the next, in the site's
+    display timezone (a wipe at 21:00 EDT on the 31st belongs to that
+    month, not the next one as it would in UTC)."""
     y, m = (int(x) for x in month.split("-"))
-    start = datetime(y, m, 1, tzinfo=timezone.utc)
-    end = datetime(y + (m == 12), m % 12 + 1, 1, tzinfo=timezone.utc)
+    start = datetime(y, m, 1, tzinfo=_tz())
+    end = datetime(y + (m == 12), m % 12 + 1, 1, tzinfo=_tz())
     return start, end
 
 
 def previous_month(now=None) -> str:
-    now = now or datetime.now(timezone.utc)
+    now = now or datetime.now(_tz())
     y, m = (now.year, now.month - 1) if now.month > 1 else (now.year - 1, 12)
     return f"{y:04d}-{m:02d}"
 
@@ -150,7 +157,7 @@ def summary_csv(reports: list[dict], state: dict) -> str:
     writer.writeheader()
     for r in reports:
         writer.writerows(blancco_report.export_rows(
-            r["file"], r["data"], r["when"].isoformat(),
+            r["file"], r["data"], r["when"].astimezone(_tz()).isoformat(),
             cloud_status(state, r["document_id"])))
     return buf.getvalue()
 
@@ -168,7 +175,7 @@ def build_evidence_zip(month: str, fileobj) -> int:
     with zipfile.ZipFile(fileobj, "w", zipfile.ZIP_DEFLATED) as zf:
         zf.writestr(f"{stem}/summary.csv", summary_csv(reports, state))
         zf.writestr(f"{stem}/README.txt", (
-            f"Blancco erasure evidence, {config.BLANCCO_SITE}, {month} (UTC)\n"
+            f"Blancco erasure evidence, {config.BLANCCO_SITE}, {month} ({config.DISPLAY_TZ})\n"
             f"{len(reports)} report(s). summary.csv has one row per erased drive,\n"
             "with failure_reason for failed wipes and cloud_upload as recorded by\n"
             "the PXE server. Certificates of record are in the Blancco Management\n"
@@ -206,7 +213,7 @@ def servicenow_items(days: int = 30, include_done: bool = False) -> list[dict]:
         items.append({
             "document_id": r["document_id"],
             "file": r["file"],
-            "when": r["when"],
+            "when": r["when"].astimezone(_tz()),
             "serial": system.get("serial", ""),
             "model": system.get("model", ""),
             "failed": bool(failed) or not erasures,
diff --git a/webapp/templates/_imaging_tiles.html b/webapp/templates/_imaging_tiles.html
index 3f1c534..b71e139 100644
--- a/webapp/templates/_imaging_tiles.html
+++ b/webapp/templates/_imaging_tiles.html
@@ -164,8 +164,8 @@
       {% endif %}
 
       <div class="mt-2 d-flex flex-wrap gap-3" style="color:var(--text-light); font-size:0.75rem;">
-        <span>started <code class="mono">{{ s.started_at or '-' }}</code></span>
-        <span>last <code class="mono">{{ s.last_updated or '-' }}</code></span>
+        <span>started <code class="mono">{{ s.started_at | local_dt(true) }}</code></span>
+        <span>last <code class="mono">{{ s.last_updated | local_dt(true) }}</code></span>
         <span>MAC <code class="mono">{{ s.mac or '-' }}</code></span>
         {% if s.current_stage %}<span class="mono">{{ s.current_stage }}</span>{% endif %}
       </div>
diff --git a/webapp/templates/imaging_detail.html b/webapp/templates/imaging_detail.html
index 89d7579..4d5a325 100644
--- a/webapp/templates/imaging_detail.html
+++ b/webapp/templates/imaging_detail.html
@@ -39,14 +39,14 @@
             <span class="mono" style="word-break: break-all;">{{ session.intune_device_id }}</span>
           {% else %}-{% endif %}
         </dd>
-        <dt class="col-4 text-light">Started</dt><dd class="col-8"><span class="mono">{{ session.started_at or '-' }}</span></dd>
-        <dt class="col-4 text-light">Last update</dt><dd class="col-8"><span class="mono">{{ session.last_updated or '-' }}</span></dd>
+        <dt class="col-4 text-light">Started</dt><dd class="col-8"><span class="mono">{{ session.started_at | local_dt(true) }}</span></dd>
+        <dt class="col-4 text-light">Last update</dt><dd class="col-8"><span class="mono">{{ session.last_updated | local_dt(true) }}</span></dd>
         <dt class="col-4 text-light">Stage</dt><dd class="col-8">
           {{ session.stage_index or 0 }}/{{ session.stage_total or '?' }}
           {% if session.current_stage %} - <span class="mono">{{ session.current_stage }}</span>{% endif %}
         </dd>
         {% if session.previous_run_at %}
-        <dt class="col-4 text-light">Prior run</dt><dd class="col-8"><span class="mono">{{ session.previous_run_at }}</span></dd>
+        <dt class="col-4 text-light">Prior run</dt><dd class="col-8"><span class="mono">{{ session.previous_run_at | local_dt(true) }}</span></dd>
         {% endif %}
         {% if session.error %}
         <dt class="col-4 text-danger">Error</dt>
@@ -66,7 +66,7 @@
           <tbody>
             {% for h in session.stage_history %}
             <tr>
-              <td><span class="mono">{{ h.ts }}</span></td>
+              <td><span class="mono">{{ h.ts | local_dt(true) }}</span></td>
               <td><span class="badge badge-secondary">{{ h.stage_index }}</span></td>
               <td>
                 <span class="badge badge-{{ 'success' if h.status == 'succeeded' else ('danger' if h.status == 'failed' else 'primary') }}">
diff --git a/webapp/templates/reports_servicenow.html b/webapp/templates/reports_servicenow.html
index 3b13c8b..7482c92 100644
--- a/webapp/templates/reports_servicenow.html
+++ b/webapp/templates/reports_servicenow.html
@@ -33,7 +33,7 @@
         <tr>
           <th>Serial</th>
           <th>Model</th>
-          <th>Wiped (UTC)</th>
+          <th>Wiped</th>
           <th>Tick in ServiceNow</th>
           <th>Destruction note</th>
           <th>Cloud</th>
@@ -48,7 +48,7 @@
             {% if it.serial %}<button type="button" class="btn btn-sm btn-outline-secondary btn-row-action copy-btn" data-copy-text="{{ it.serial }}">copy</button>{% endif %}
           </td>
           <td>{{ it.model or '-' }}</td>
-          <td class="mono text-nowrap">{{ it.when.strftime('%Y-%m-%d %H:%M') }}</td>
+          <td class="mono text-nowrap">{{ it.when | local_dt }}</td>
           <td>
             {% if it.failed %}<span class="badge badge-danger">Blancco Wipe failed</span>
             {% else %}<span class="badge badge-success">Wiped</span>{% endif %}
diff --git a/webapp/templates/reports_todo.html b/webapp/templates/reports_todo.html
index 905458c..bee84d0 100644
--- a/webapp/templates/reports_todo.html
+++ b/webapp/templates/reports_todo.html
@@ -62,13 +62,13 @@
   <p class="mb-2">Remove the drive, destroy it per site procedure, record the Certificate of Destruction and the destruction note on the RITM, then mark it here.</p>
   <div class="table-container">
     <table class="data-table">
-      <thead><tr><th>Serial</th><th>Model</th><th>Wiped (UTC)</th><th>Failure</th><th class="text-end">Actions</th></tr></thead>
+      <thead><tr><th>Serial</th><th>Model</th><th>Wiped</th><th>Failure</th><th class="text-end">Actions</th></tr></thead>
       <tbody>
         {% for it in todo.failed %}
         <tr title="{{ it.file }}">
           <td class="mono">{{ it.serial or '-' }}</td>
           <td>{{ it.model or '-' }}</td>
-          <td class="mono text-nowrap">{{ it.when.strftime('%Y-%m-%d %H:%M') }}</td>
+          <td class="mono text-nowrap">{{ it.when | local_dt }}</td>
           <td class="small wrap">{{ it.note }}</td>
           <td class="text-end text-nowrap">
             <a href="{{ url_for('blancco_view_report', filename=it.file) }}" class="pxe-btn pxe-btn-secondary btn-row-action"><i class="bi bi-eye"></i> Report</a>
@@ -94,13 +94,13 @@
   <p class="mb-2">Auditors pull certificates from the Blancco Management Portal. Upload the report's XML there by hand, then mark it resolved.</p>
   <div class="table-container">
     <table class="data-table">
-      <thead><tr><th>Serial</th><th>Model</th><th>Wiped (UTC)</th><th class="text-end">Actions</th></tr></thead>
+      <thead><tr><th>Serial</th><th>Model</th><th>Wiped</th><th class="text-end">Actions</th></tr></thead>
       <tbody>
         {% for it in todo.not_in_cloud %}
         <tr title="{{ it.file }}">
           <td class="mono">{{ it.serial or '-' }}</td>
           <td>{{ it.model or '-' }}</td>
-          <td class="mono text-nowrap">{{ it.when.strftime('%Y-%m-%d %H:%M') }}</td>
+          <td class="mono text-nowrap">{{ it.when | local_dt }}</td>
           <td class="text-end text-nowrap">
             <a href="{{ url_for('blancco_download_report', filename=it.file) }}" class="pxe-btn pxe-btn-secondary btn-row-action"><i class="bi bi-download"></i> XML</a>
             <form method="post" action="{{ url_for('blancco_todo_mark', kind='cloud_resolved', key=it.document_id) }}" style="display:inline;">