From a85979731f90cf6ebfdbbcc47a6cd34762bf7560 Mon Sep 17 00:00:00 2001
From: harry <loeweneer@gmail.com>
Date: Wed, 17 Jun 2026 20:40:43 +0500
Subject: [PATCH] use tajik timezone for displaying dates

---
 src/lib/i18n/store.js                 |  17 ++++
 src/lib/server/reports.js             |   8 +-
 src/routes/+page.svelte               |   4 +-
 src/routes/admin/reports/+page.svelte |  10 +-
 src/routes/invoices/[id]/+page.svelte |   4 +-
 src/routes/parts/[id]/+page.svelte    |   8 +-
 timestamp-tz.patch                    | 137 ++++++++++++++++++++++++++
 7 files changed, 168 insertions(+), 20 deletions(-)
 create mode 100644 timestamp-tz.patch

diff --git a/src/lib/i18n/store.js b/src/lib/i18n/store.js
index 28b2d40..046e72a 100644
--- a/src/lib/i18n/store.js
+++ b/src/lib/i18n/store.js
@@ -85,3 +85,20 @@ export function formatMoney(dirams, lang = 'en') {
   const s = n.toFixed(2);
   return lang === 'tg' ? s.replace('.', ',') : s;
 }
+
+export function formatTs(utcStr) {
+  if (!utcStr) return '';
+
+  const normalized = String(utcStr).trim().replace(' ', 'T');
+  const utcDate = new Date(`${normalized}Z`);
+  if (Number.isNaN(utcDate.getTime())) return utcStr;
+
+  const tajikDate = new Date(utcDate.getTime() + 5 * 60 * 60 * 1000);
+  const pad = (n) => String(n).padStart(2, '0');
+
+  return [
+    pad(tajikDate.getUTCDate()),
+    pad(tajikDate.getUTCMonth() + 1),
+    tajikDate.getUTCFullYear()
+  ].join('.') + ` ${pad(tajikDate.getUTCHours())}:${pad(tajikDate.getUTCMinutes())}`;
+}
diff --git a/src/lib/server/reports.js b/src/lib/server/reports.js
index 5897b1e..4eca19b 100644
--- a/src/lib/server/reports.js
+++ b/src/lib/server/reports.js
@@ -1,6 +1,6 @@
 import { getDb } from './db.js';
 
-// All time windows are computed in local time using SQLite's `datetime('now', 'localtime')`.
+// All time windows are computed in Tajikistan time (UTC+5) while timestamps are stored as UTC.
 // Cost of goods (COG) and profit are computed against each part's current cost_price —
 // the schema does not snapshot cost at sale time, so historical cost changes are not
 // reflected. Custom (non-inventory) lines contribute to sale revenue but have zero COG.
@@ -29,9 +29,9 @@ function windowStats(dateClause) {
 export function salesSummary() {
   return {
     all_time: windowStats(''),
-    today: windowStats(`date(saved_at, 'localtime') = date('now', 'localtime')`),
-    week: windowStats(`date(saved_at, 'localtime') >= date('now', 'localtime', '-6 days')`),
-    month: windowStats(`strftime('%Y-%m', saved_at, 'localtime') = strftime('%Y-%m', 'now', 'localtime')`)
+    today: windowStats(`date(saved_at, '+5 hours') = date('now', '+5 hours')`),
+    week: windowStats(`date(saved_at, '+5 hours') >= date('now', '+5 hours', '-6 days')`),
+    month: windowStats(`strftime('%Y-%m', saved_at, '+5 hours') = strftime('%Y-%m', 'now', '+5 hours')`)
   };
 }
 
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 31c624b..a899500 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -1,5 +1,5 @@
 <script>
-  import { locale, t, localized } from '$lib/i18n/store.js';
+  import { locale, t, localized, formatTs } from '$lib/i18n/store.js';
 
   export let data;
   $: lang = $locale;
@@ -48,7 +48,7 @@
     <tbody>
       {#each movements as m}
         <tr>
-          <td>{m.created_at}</td>
+          <td>{formatTs(m.created_at)}</td>
           <td><span class="pill">{$t('movements.type_' + m.movement_type)}</span></td>
           <td><a href="/parts/{m.part_id}">{localized(m, 'name', lang)}</a></td>
           <td class="num">{m.quantity}</td>
diff --git a/src/routes/admin/reports/+page.svelte b/src/routes/admin/reports/+page.svelte
index 9e3483a..cb576a3 100644
--- a/src/routes/admin/reports/+page.svelte
+++ b/src/routes/admin/reports/+page.svelte
@@ -1,16 +1,10 @@
 <script>
-  import { locale, t, localized, formatMoney } from '$lib/i18n/store.js';
+  import { locale, t, localized, formatMoney, formatTs } from '$lib/i18n/store.js';
 
   export let data;
   $: lang = $locale;
   $: ({ sales, topParts, inventory, recentSales } = data);
 
-  function formatWhen(iso) {
-    if (!iso) return '';
-    const d = new Date(iso.replace(' ', 'T') + 'Z');
-    const pad = (n) => String(n).padStart(2, '0');
-    return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
-  }
 </script>
 
 <h2>{$t('reports.sales_heading')}</h2>
@@ -128,7 +122,7 @@
     <tbody>
       {#each recentSales as s}
         <tr>
-          <td>{formatWhen(s.saved_at)}</td>
+          <td>{formatTs(s.saved_at)}</td>
           <td class="num">{s.line_count}</td>
           <td class="num">
             {formatMoney(s.sale_dirams, lang)}
diff --git a/src/routes/invoices/[id]/+page.svelte b/src/routes/invoices/[id]/+page.svelte
index 31958d3..eedcdd4 100644
--- a/src/routes/invoices/[id]/+page.svelte
+++ b/src/routes/invoices/[id]/+page.svelte
@@ -1,5 +1,5 @@
 <script>
-  import { locale, t, localized, formatMoney } from '$lib/i18n/store.js';
+  import { locale, t, localized, formatMoney, formatTs } from '$lib/i18n/store.js';
 
   export let data;
   $: lang = $locale;
@@ -15,7 +15,7 @@
   <header class="head">
     <div>
       <h1>{$t('invoices.saved_title')} #{invoice.id}</h1>
-      <p class="muted">{invoice.saved_at}</p>
+      <p class="muted">{formatTs(invoice.saved_at)}</p>
     </div>
     <a href="/invoices/new" class="print-hide back">← {$t('invoices.new_another')}</a>
   </header>
diff --git a/src/routes/parts/[id]/+page.svelte b/src/routes/parts/[id]/+page.svelte
index 1ec380e..57551c2 100644
--- a/src/routes/parts/[id]/+page.svelte
+++ b/src/routes/parts/[id]/+page.svelte
@@ -1,6 +1,6 @@
 <script>
   import { enhance } from '$app/forms';
-  import { locale, t, localized, formatMoney } from '$lib/i18n/store.js';
+  import { locale, t, localized, formatMoney, formatTs } from '$lib/i18n/store.js';
 
   export let data;
   export let form;
@@ -117,8 +117,8 @@
         {$t('parts.reorder_level')}: {part.reorder_level}
       </div>
       <hr />
-      <div class="muted small">{$t('common.created')}: {part.created_at}</div>
-      <div class="muted small">{$t('common.updated')}: {part.updated_at}</div>
+      <div class="muted small">{$t('common.created')}: {formatTs(part.created_at)}</div>
+      <div class="muted small">{$t('common.updated')}: {formatTs(part.updated_at)}</div>
     </div>
 
     <h2>{$t('parts.recent_movements')}</h2>
@@ -137,7 +137,7 @@
         <tbody>
           {#each movements as m}
             <tr>
-              <td>{m.created_at}</td>
+              <td>{formatTs(m.created_at)}</td>
               <td><span class="pill">{$t('movements.type_' + m.movement_type)}</span></td>
               <td class="num">{m.quantity > 0 ? '+' : ''}{m.quantity}</td>
               <td class="num">{m.unit_price != null ? formatMoney(m.unit_price, lang) : $t('common.none')}</td>
diff --git a/timestamp-tz.patch b/timestamp-tz.patch
new file mode 100644
index 0000000..539c2c2
--- /dev/null
+++ b/timestamp-tz.patch
@@ -0,0 +1,137 @@
+Format timestamps as Asia/Dushanbe (UTC+5)
+
+SQLite stores all timestamps as UTC via datetime('now'). The UI was
+rendering them raw (e.g. "2026-05-18 15:42:03"), which is 5 hours
+behind local time for Tajikistan.
+
+Add formatTs() to the i18n store alongside formatMoney/localized.
+It appends 'Z' so JS Date treats the SQLite string as UTC, then
+formats with Intl using the Asia/Dushanbe timezone (ru-RU locale).
+
+Replace all bare timestamp renders on:
+- / (dashboard: recent movements created_at)
+- /parts/[id] (part created_at, updated_at, movement history)
+- /invoices/[id] (invoice saved_at on receipt)
+- /admin/reports (recent sales saved_at; replaces local formatWhen)
+
+Tested: UTC "2026-05-18 15:42:03" -> "18.05.2026, 20:42" (pass)
+        UTC "2026-05-18 00:30:00" -> "18.05.2026, 05:30" (pass)
+        null/empty/invalid input handled gracefully (pass)
+
+Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
+---
+ src/lib/i18n/store.js                      | 15 +++++++++++++++
+ src/routes/+page.svelte                    |  2 +-
+ src/routes/admin/reports/+page.svelte      |  9 +--------
+ src/routes/invoices/[id]/+page.svelte      |  2 +-
+ src/routes/parts/[id]/+page.svelte         |  4 ++--
+ 5 files changed, 20 insertions(+), 12 deletions(-)
+
+diff --git a/src/lib/i18n/store.js b/src/lib/i18n/store.js
+--- a/src/lib/i18n/store.js
++++ b/src/lib/i18n/store.js
+@@ -1,3 +1,18 @@
++// formatTs: convert a SQLite UTC timestamp string ("YYYY-MM-DD HH:MM:SS")
++// to a human-readable local time in Asia/Dushanbe (UTC+5).
++// The appended 'Z' is critical — without it JS parses as local time.
++export function formatTs(utcStr) {
++  if (!utcStr) return '';
++  const d = new Date(utcStr.replace(' ', 'T') + 'Z');
++  if (isNaN(d.getTime())) return utcStr;
++  return d.toLocaleString('ru-RU', {
++    timeZone: 'Asia/Dushanbe',
++    day:    '2-digit',
++    month:  '2-digit',
++    year:   'numeric',
++    hour:   '2-digit',
++    minute: '2-digit',
++  });
++}
++
+diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
+--- a/src/routes/+page.svelte
++++ b/src/routes/+page.svelte
+@@ -1,6 +1,6 @@
+ <script>
+-  import { locale, t, localized } from '$lib/i18n/store.js';
++  import { locale, t, localized, formatTs } from '$lib/i18n/store.js';
+ 
+   export let data;
+   $: lang = $locale;
+@@ -48,7 +48,7 @@
+       {#each movements as m}
+         <tr>
+-          <td>{m.created_at}</td>
++          <td>{formatTs(m.created_at)}</td>
+           <td><span class="pill">{$t('movements.type_' + m.movement_type)}</span></td>
+           <td><a href="/parts/{m.part_id}">{localized(m, 'name', lang)}</a></td>
+           <td class="num">{m.quantity}</td>
+
+diff --git a/src/routes/admin/reports/+page.svelte b/src/routes/admin/reports/+page.svelte
+--- a/src/routes/admin/reports/+page.svelte
++++ b/src/routes/admin/reports/+page.svelte
+@@ -1,6 +1,6 @@
+ <script>
+-  import { locale, t, localized, formatMoney } from '$lib/i18n/store.js';
++  import { locale, t, localized, formatMoney, formatTs } from '$lib/i18n/store.js';
+ 
+   export let data;
+   $: lang = $locale;
+   $: ({ sales, topParts, inventory, recentSales } = data);
+ 
+-  function formatWhen(iso) {
+-    if (!iso) return '';
+-    const d = new Date(iso.replace(' ', 'T') + 'Z');
+-    const pad = (n) => String(n).padStart(2, '0');
+-    return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
+-  }
+ </script>
+@@ -139,7 +132,7 @@
+       {#each recentSales as s}
+         <tr>
+-          <td>{formatWhen(s.saved_at)}</td>
++          <td>{formatTs(s.saved_at)}</td>
+           <td class="num">{s.line_count}</td>
+
+diff --git a/src/routes/invoices/[id]/+page.svelte b/src/routes/invoices/[id]/+page.svelte
+--- a/src/routes/invoices/[id]/+page.svelte
++++ b/src/routes/invoices/[id]/+page.svelte
+@@ -1,6 +1,6 @@
+ <script>
+-  import { locale, t, localized, formatMoney } from '$lib/i18n/store.js';
++  import { locale, t, localized, formatMoney, formatTs } from '$lib/i18n/store.js';
+ 
+   export let data;
+   $: lang = $locale;
+@@ -16,7 +16,7 @@
+   <header class="head">
+     <div>
+       <h1>{$t('invoices.saved_title')} #{invoice.id}</h1>
+-      <p class="muted">{invoice.saved_at}</p>
++      <p class="muted">{formatTs(invoice.saved_at)}</p>
+     </div>
+
+diff --git a/src/routes/parts/[id]/+page.svelte b/src/routes/parts/[id]/+page.svelte
+--- a/src/routes/parts/[id]/+page.svelte
++++ b/src/routes/parts/[id]/+page.svelte
+@@ -1,7 +1,7 @@
+ <script>
+   import { enhance } from '$app/forms';
+-  import { locale, t, localized, formatMoney } from '$lib/i18n/store.js';
++  import { locale, t, localized, formatMoney, formatTs } from '$lib/i18n/store.js';
+ 
+   export let data;
+   export let form;
+@@ -115,8 +115,8 @@
+       <hr />
+-      <div class="muted small">{$t('common.created')}: {part.created_at}</div>
+-      <div class="muted small">{$t('common.updated')}: {part.updated_at}</div>
++      <div class="muted small">{$t('common.created')}: {formatTs(part.created_at)}</div>
++      <div class="muted small">{$t('common.updated')}: {formatTs(part.updated_at)}</div>
+     </div>
+@@ -131,7 +131,7 @@
+           {#each movements as m}
+             <tr>
+-              <td>{m.created_at}</td>
++              <td>{formatTs(m.created_at)}</td>
+               <td><span class="pill">{$t('movements.type_' + m.movement_type)}</span></td>