diff --git a/.claude/skills/skd-compile/scripts/skd-compile.ps1 b/.claude/skills/skd-compile/scripts/skd-compile.ps1
index af565106..65f8ccce 100644
--- a/.claude/skills/skd-compile/scripts/skd-compile.ps1
+++ b/.claude/skills/skd-compile/scripts/skd-compile.ps1
@@ -1,4 +1,4 @@
-# skd-compile v1.81 — Compile 1C DCS from JSON
+# skd-compile v1.82 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[string]$DefinitionFile,
@@ -1496,12 +1496,14 @@ function Emit-ParamValue {
 	$valStr = "$val"
 
 	if ($type -eq "StandardPeriod") {
-		# val is a period variant string like "LastMonth" or "Custom".
-		# Always emit startDate/endDate to match how 1C Designer saves the schema.
+		# Platform-pattern: startDate/endDate эмитятся ТОЛЬКО для variant=Custom.
+		# Для всех остальных вариантов (ThisMonth, LastYear, Today, ...) — без дат.
 		X "$indent<value xsi:type=`"v8:StandardPeriod`">"
 		X "$indent`t<v8:variant xsi:type=`"v8:StandardPeriodVariant`">$(Esc-Xml $valStr)</v8:variant>"
-		X "$indent`t<v8:startDate>0001-01-01T00:00:00</v8:startDate>"
-		X "$indent`t<v8:endDate>0001-01-01T00:00:00</v8:endDate>"
+		if ($valStr -eq 'Custom') {
+			X "$indent`t<v8:startDate>0001-01-01T00:00:00</v8:startDate>"
+			X "$indent`t<v8:endDate>0001-01-01T00:00:00</v8:endDate>"
+		}
 		X "$indent</value>"
 	} elseif ($type -match '^date') {
 		X "$indent<value xsi:type=`"xs:dateTime`">$(Esc-Xml $valStr)</value>"
@@ -2575,7 +2577,8 @@ function Emit-DataParameters {
 		} elseif ($null -ne $dp.value) {
 			$vtype = "$($dp.valueType)"
 			if (($dp.value -is [PSCustomObject] -or $dp.value -is [hashtable]) -and ($dp.value.variant)) {
-				# StandardPeriod (PSCustomObject from JSON / hashtable from shorthand parser)
+				# StandardPeriod (PSCustomObject from JSON / hashtable from shorthand parser).
+				# Platform-pattern: startDate/endDate ТОЛЬКО для variant=Custom.
 				$_sd = $null; $_ed = $null
 				if ($dp.value -is [PSCustomObject]) {
 					if ($dp.value.PSObject.Properties['startDate']) { $_sd = "$($dp.value.startDate)" }
@@ -2584,12 +2587,15 @@ function Emit-DataParameters {
 					if ($dp.value.Contains('startDate')) { $_sd = "$($dp.value['startDate'])" }
 					if ($dp.value.Contains('endDate'))   { $_ed = "$($dp.value['endDate'])" }
 				}
-				if (-not $_sd) { $_sd = '0001-01-01T00:00:00' }
-				if (-not $_ed) { $_ed = '0001-01-01T00:00:00' }
+				$_variantStr = "$($dp.value.variant)"
 				X "$indent`t`t<dcscor:value xsi:type=`"v8:StandardPeriod`">"
-				X "$indent`t`t`t<v8:variant xsi:type=`"v8:StandardPeriodVariant`">$(Esc-Xml "$($dp.value.variant)")</v8:variant>"
-				X "$indent`t`t`t<v8:startDate>$(Esc-Xml $_sd)</v8:startDate>"
-				X "$indent`t`t`t<v8:endDate>$(Esc-Xml $_ed)</v8:endDate>"
+				X "$indent`t`t`t<v8:variant xsi:type=`"v8:StandardPeriodVariant`">$(Esc-Xml $_variantStr)</v8:variant>"
+				if ($_variantStr -eq 'Custom') {
+					if (-not $_sd) { $_sd = '0001-01-01T00:00:00' }
+					if (-not $_ed) { $_ed = '0001-01-01T00:00:00' }
+					X "$indent`t`t`t<v8:startDate>$(Esc-Xml $_sd)</v8:startDate>"
+					X "$indent`t`t`t<v8:endDate>$(Esc-Xml $_ed)</v8:endDate>"
+				}
 				X "$indent`t`t</dcscor:value>"
 			} elseif ($vtype -match '^[a-zA-Z]+:') {
 				# Полный xsi:type из decompile (например "xs:boolean", "dcscor:DesignTimeValue").
diff --git a/.claude/skills/skd-compile/scripts/skd-compile.py b/.claude/skills/skd-compile/scripts/skd-compile.py
index 3bf27198..dfe37cc3 100644
--- a/.claude/skills/skd-compile/scripts/skd-compile.py
+++ b/.claude/skills/skd-compile/scripts/skd-compile.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# skd-compile v1.81 — Compile 1C DCS from JSON
+# skd-compile v1.82 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 import argparse
 import json
@@ -1035,11 +1035,12 @@ def emit_param_value(lines, type_str, val, indent, value_list_allowed=False):
     val_str = str(val)
 
     if type_str == 'StandardPeriod':
-        # Always emit startDate/endDate to match how 1C Designer saves the schema.
+        # Platform-pattern: startDate/endDate ТОЛЬКО для variant=Custom.
         lines.append(f'{indent}<value xsi:type="v8:StandardPeriod">')
         lines.append(f'{indent}\t<v8:variant xsi:type="v8:StandardPeriodVariant">{esc_xml(val_str)}</v8:variant>')
-        lines.append(f'{indent}\t<v8:startDate>0001-01-01T00:00:00</v8:startDate>')
-        lines.append(f'{indent}\t<v8:endDate>0001-01-01T00:00:00</v8:endDate>')
+        if val_str == 'Custom':
+            lines.append(f'{indent}\t<v8:startDate>0001-01-01T00:00:00</v8:startDate>')
+            lines.append(f'{indent}\t<v8:endDate>0001-01-01T00:00:00</v8:endDate>')
         lines.append(f'{indent}</value>')
     elif type_str and re.match(r'^date', type_str):
         lines.append(f'{indent}<value xsi:type="xs:dateTime">{esc_xml(val_str)}</value>')
@@ -2091,13 +2092,15 @@ def emit_data_parameters(lines, items, indent):
             val = dp['value']
             vtype = str(dp.get('valueType') or '')
             if isinstance(val, dict) and val.get('variant'):
-                # StandardPeriod (с явными датами или boilerplate)
-                sd = str(val.get('startDate') or '0001-01-01T00:00:00')
-                ed = str(val.get('endDate') or '0001-01-01T00:00:00')
+                # StandardPeriod. Platform-pattern: startDate/endDate ТОЛЬКО для variant=Custom.
+                variant_str = str(val['variant'])
                 lines.append(f'{indent}\t\t<dcscor:value xsi:type="v8:StandardPeriod">')
-                lines.append(f'{indent}\t\t\t<v8:variant xsi:type="v8:StandardPeriodVariant">{esc_xml(str(val["variant"]))}</v8:variant>')
-                lines.append(f'{indent}\t\t\t<v8:startDate>{esc_xml(sd)}</v8:startDate>')
-                lines.append(f'{indent}\t\t\t<v8:endDate>{esc_xml(ed)}</v8:endDate>')
+                lines.append(f'{indent}\t\t\t<v8:variant xsi:type="v8:StandardPeriodVariant">{esc_xml(variant_str)}</v8:variant>')
+                if variant_str == 'Custom':
+                    sd = str(val.get('startDate') or '0001-01-01T00:00:00')
+                    ed = str(val.get('endDate') or '0001-01-01T00:00:00')
+                    lines.append(f'{indent}\t\t\t<v8:startDate>{esc_xml(sd)}</v8:startDate>')
+                    lines.append(f'{indent}\t\t\t<v8:endDate>{esc_xml(ed)}</v8:endDate>')
                 lines.append(f'{indent}\t\t</dcscor:value>')
             elif re.match(r'^[a-zA-Z]+:', vtype):
                 # Полный xsi:type из decompile (например "xs:boolean", "dcscor:DesignTimeValue").
diff --git a/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml b/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml
index da151f4a..bd33ea82 100644
--- a/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml
+++ b/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml
@@ -35,8 +35,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
@@ -170,8 +168,6 @@
 					<dcscor:parameter>Период</dcscor:parameter>
 					<dcscor:value xsi:type="v8:StandardPeriod">
 						<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-						<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-						<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 					</dcscor:value>
 					<dcsset:userSettingID>UUID-001</dcsset:userSettingID>
 				</dcscor:item>
diff --git a/tests/skills/cases/skd-compile/snapshots/full-example/Template.xml b/tests/skills/cases/skd-compile/snapshots/full-example/Template.xml
index 00688565..de09759f 100644
--- a/tests/skills/cases/skd-compile/snapshots/full-example/Template.xml
+++ b/tests/skills/cases/skd-compile/snapshots/full-example/Template.xml
@@ -65,8 +65,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
@@ -141,8 +139,6 @@
 					<dcscor:parameter>Период</dcscor:parameter>
 					<dcscor:value xsi:type="v8:StandardPeriod">
 						<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-						<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-						<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 					</dcscor:value>
 					<dcsset:userSettingID>UUID-002</dcsset:userSettingID>
 				</dcscor:item>
diff --git a/tests/skills/cases/skd-compile/snapshots/with-filters/Template.xml b/tests/skills/cases/skd-compile/snapshots/with-filters/Template.xml
index 886d56f2..64d85bd1 100644
--- a/tests/skills/cases/skd-compile/snapshots/with-filters/Template.xml
+++ b/tests/skills/cases/skd-compile/snapshots/with-filters/Template.xml
@@ -60,8 +60,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
@@ -148,8 +146,6 @@
 					<dcscor:parameter>Период</dcscor:parameter>
 					<dcscor:value xsi:type="v8:StandardPeriod">
 						<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-						<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-						<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 					</dcscor:value>
 					<dcsset:userSettingID>UUID-002</dcsset:userSettingID>
 				</dcscor:item>
diff --git a/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml b/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml
index a09afb7e..641a5553 100644
--- a/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml
+++ b/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml
@@ -57,8 +57,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
diff --git a/tests/skills/cases/skd-decompile/snapshots/calc-total-params/Template.xml b/tests/skills/cases/skd-decompile/snapshots/calc-total-params/Template.xml
index 942a3851..46d94609 100644
--- a/tests/skills/cases/skd-decompile/snapshots/calc-total-params/Template.xml
+++ b/tests/skills/cases/skd-decompile/snapshots/calc-total-params/Template.xml
@@ -100,8 +100,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
diff --git a/tests/skills/cases/skd-decompile/snapshots/variant-full/Template.xml b/tests/skills/cases/skd-decompile/snapshots/variant-full/Template.xml
index 8fff1c0d..f18eb6c3 100644
--- a/tests/skills/cases/skd-decompile/snapshots/variant-full/Template.xml
+++ b/tests/skills/cases/skd-decompile/snapshots/variant-full/Template.xml
@@ -78,8 +78,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
@@ -358,8 +356,6 @@
 					<dcscor:parameter>Период</dcscor:parameter>
 					<dcscor:value xsi:type="v8:StandardPeriod">
 						<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-						<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-						<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 					</dcscor:value>
 					<dcsset:userSettingID>UUID-003</dcsset:userSettingID>
 				</dcscor:item>
diff --git a/tests/skills/cases/skd-edit/snapshots/empty-dataparam-values/Template.xml b/tests/skills/cases/skd-edit/snapshots/empty-dataparam-values/Template.xml
index d67aad06..0bea5077 100644
--- a/tests/skills/cases/skd-edit/snapshots/empty-dataparam-values/Template.xml
+++ b/tests/skills/cases/skd-edit/snapshots/empty-dataparam-values/Template.xml
@@ -35,8 +35,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 	</parameter>
diff --git a/tests/skills/cases/skd-edit/snapshots/modify-dataParameter-preserves-use/Template.xml b/tests/skills/cases/skd-edit/snapshots/modify-dataParameter-preserves-use/Template.xml
index b3a927a9..4d91f3b3 100644
--- a/tests/skills/cases/skd-edit/snapshots/modify-dataParameter-preserves-use/Template.xml
+++ b/tests/skills/cases/skd-edit/snapshots/modify-dataParameter-preserves-use/Template.xml
@@ -35,8 +35,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 	</parameter>
diff --git a/tests/skills/cases/skd-edit/snapshots/modify-parameter-title/Template.xml b/tests/skills/cases/skd-edit/snapshots/modify-parameter-title/Template.xml
index 286fd742..a85db38a 100644
--- a/tests/skills/cases/skd-edit/snapshots/modify-parameter-title/Template.xml
+++ b/tests/skills/cases/skd-edit/snapshots/modify-parameter-title/Template.xml
@@ -41,8 +41,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
diff --git a/tests/skills/cases/skd-edit/snapshots/rename-parameter/Template.xml b/tests/skills/cases/skd-edit/snapshots/rename-parameter/Template.xml
index a88d7fb7..2e761be9 100644
--- a/tests/skills/cases/skd-edit/snapshots/rename-parameter/Template.xml
+++ b/tests/skills/cases/skd-edit/snapshots/rename-parameter/Template.xml
@@ -35,8 +35,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
@@ -106,8 +104,6 @@
 					<dcscor:parameter>ПериодОтчета</dcscor:parameter>
 					<dcscor:value xsi:type="v8:StandardPeriod">
 						<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-						<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-						<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 					</dcscor:value>
 					<dcsset:userSettingID>UUID-001</dcsset:userSettingID>
 				</dcscor:item>
diff --git a/tests/skills/cases/skd-edit/snapshots/reorder-parameters/Template.xml b/tests/skills/cases/skd-edit/snapshots/reorder-parameters/Template.xml
index b093b213..d01bee5a 100644
--- a/tests/skills/cases/skd-edit/snapshots/reorder-parameters/Template.xml
+++ b/tests/skills/cases/skd-edit/snapshots/reorder-parameters/Template.xml
@@ -34,8 +34,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 	</parameter>
diff --git a/tests/skills/cases/skd-info/snapshots/overview-with-params/Template.xml b/tests/skills/cases/skd-info/snapshots/overview-with-params/Template.xml
index 24a8e3f8..5acb6122 100644
--- a/tests/skills/cases/skd-info/snapshots/overview-with-params/Template.xml
+++ b/tests/skills/cases/skd-info/snapshots/overview-with-params/Template.xml
@@ -65,8 +65,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
@@ -141,8 +139,6 @@
 					<dcscor:parameter>Период</dcscor:parameter>
 					<dcscor:value xsi:type="v8:StandardPeriod">
 						<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-						<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-						<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 					</dcscor:value>
 					<dcsset:userSettingID>UUID-002</dcsset:userSettingID>
 				</dcscor:item>
diff --git a/tests/skills/cases/skd-validate/snapshots/valid-full/Template.xml b/tests/skills/cases/skd-validate/snapshots/valid-full/Template.xml
index af20dce5..e5d3d4e8 100644
--- a/tests/skills/cases/skd-validate/snapshots/valid-full/Template.xml
+++ b/tests/skills/cases/skd-validate/snapshots/valid-full/Template.xml
@@ -75,8 +75,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>
@@ -154,8 +152,6 @@
 					<dcscor:parameter>Период</dcscor:parameter>
 					<dcscor:value xsi:type="v8:StandardPeriod">
 						<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-						<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-						<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 					</dcscor:value>
 					<dcsset:userSettingID>UUID-002</dcsset:userSettingID>
 				</dcscor:item>
diff --git a/tests/skills/cases/skd-validate/snapshots/valid-with-params/Template.xml b/tests/skills/cases/skd-validate/snapshots/valid-with-params/Template.xml
index 6871c608..3bc51af5 100644
--- a/tests/skills/cases/skd-validate/snapshots/valid-with-params/Template.xml
+++ b/tests/skills/cases/skd-validate/snapshots/valid-with-params/Template.xml
@@ -65,8 +65,6 @@
 		</valueType>
 		<value xsi:type="v8:StandardPeriod">
 			<v8:variant xsi:type="v8:StandardPeriodVariant">LastMonth</v8:variant>
-			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
-			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
 		</value>
 		<useRestriction>false</useRestriction>
 		<denyIncompleteValues>true</denyIncompleteValues>