diff --git a/.claude/skills/skd-compile/scripts/skd-compile.ps1 b/.claude/skills/skd-compile/scripts/skd-compile.ps1
index b08d59a0..b5d680e1 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 v1.89 — Compile 1C DCS from JSON
+# skd-compile v1.90 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[string]$DefinitionFile,
@@ -2711,8 +2711,13 @@ function Emit-GroupItems {
 			X "$indent`t`t<dcsset:groupType>$(Esc-Xml $gt)</dcsset:groupType>"
 			$pat = if ($field.periodAdditionType) { "$($field.periodAdditionType)" } else { "None" }
 			X "$indent`t`t<dcsset:periodAdditionType>$(Esc-Xml $pat)</dcsset:periodAdditionType>"
-			X "$indent`t`t<dcsset:periodAdditionBegin xsi:type=`"xs:dateTime`">0001-01-01T00:00:00</dcsset:periodAdditionBegin>"
-			X "$indent`t`t<dcsset:periodAdditionEnd xsi:type=`"xs:dateTime`">0001-01-01T00:00:00</dcsset:periodAdditionEnd>"
+			# Auto-detect: ISO date → xs:dateTime, иначе → dcscor:Field (path).
+			$pab = if ($field.periodAdditionBegin) { "$($field.periodAdditionBegin)" } else { '0001-01-01T00:00:00' }
+			$pae = if ($field.periodAdditionEnd)   { "$($field.periodAdditionEnd)"   } else { '0001-01-01T00:00:00' }
+			$pabT = if ($pab -match '^\d{4}-\d{2}-\d{2}T') { 'xs:dateTime' } else { 'dcscor:Field' }
+			$paeT = if ($pae -match '^\d{4}-\d{2}-\d{2}T') { 'xs:dateTime' } else { 'dcscor:Field' }
+			X "$indent`t`t<dcsset:periodAdditionBegin xsi:type=`"$pabT`">$(Esc-Xml $pab)</dcsset:periodAdditionBegin>"
+			X "$indent`t`t<dcsset:periodAdditionEnd xsi:type=`"$paeT`">$(Esc-Xml $pae)</dcsset:periodAdditionEnd>"
 			X "$indent`t</dcsset:item>"
 		}
 	}
diff --git a/.claude/skills/skd-compile/scripts/skd-compile.py b/.claude/skills/skd-compile/scripts/skd-compile.py
index 44e45d1a..74d42999 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 v1.89 — Compile 1C DCS from JSON
+# skd-compile v1.90 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 import argparse
 import json
@@ -2192,8 +2192,13 @@ def emit_group_items(lines, group_by, indent):
             lines.append(f'{indent}\t\t<dcsset:groupType>{esc_xml(gt)}</dcsset:groupType>')
             pat = str(field.get('periodAdditionType', 'None'))
             lines.append(f'{indent}\t\t<dcsset:periodAdditionType>{esc_xml(pat)}</dcsset:periodAdditionType>')
-            lines.append(f'{indent}\t\t<dcsset:periodAdditionBegin xsi:type="xs:dateTime">0001-01-01T00:00:00</dcsset:periodAdditionBegin>')
-            lines.append(f'{indent}\t\t<dcsset:periodAdditionEnd xsi:type="xs:dateTime">0001-01-01T00:00:00</dcsset:periodAdditionEnd>')
+            # Auto-detect: ISO date → xs:dateTime, иначе → dcscor:Field (path).
+            pab = str(field.get('periodAdditionBegin', '0001-01-01T00:00:00'))
+            pae = str(field.get('periodAdditionEnd', '0001-01-01T00:00:00'))
+            pab_t = 'xs:dateTime' if re.match(r'^\d{4}-\d{2}-\d{2}T', pab) else 'dcscor:Field'
+            pae_t = 'xs:dateTime' if re.match(r'^\d{4}-\d{2}-\d{2}T', pae) else 'dcscor:Field'
+            lines.append(f'{indent}\t\t<dcsset:periodAdditionBegin xsi:type="{pab_t}">{esc_xml(pab)}</dcsset:periodAdditionBegin>')
+            lines.append(f'{indent}\t\t<dcsset:periodAdditionEnd xsi:type="{pae_t}">{esc_xml(pae)}</dcsset:periodAdditionEnd>')
             lines.append(f'{indent}\t</dcsset:item>')
     lines.append(f'{indent}</dcsset:groupItems>')
 
diff --git a/.claude/skills/skd-decompile/scripts/skd-decompile.ps1 b/.claude/skills/skd-decompile/scripts/skd-decompile.ps1
index 6a8caed3..ecfe6844 100644
--- a/.claude/skills/skd-decompile/scripts/skd-decompile.ps1
+++ b/.claude/skills/skd-decompile/scripts/skd-decompile.ps1
@@ -1,4 +1,4 @@
-# skd-decompile v0.72 — Decompile 1C DCS Template.xml to JSON DSL (draft)
+# skd-decompile v0.73 — Decompile 1C DCS Template.xml to JSON DSL (draft)
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[Parameter(Mandatory)]
@@ -1936,13 +1936,30 @@ function Get-GroupFields {
 			$gf = Get-Text $gItem "dcsset:field"
 			$pat = Get-Text $gItem "dcsset:periodAdditionType"
 			$gt = Get-Text $gItem "dcsset:groupType"
-			$isDefault = (-not $pat -or $pat -eq 'None') -and (-not $gt -or $gt -eq 'Items')
+			# periodAdditionBegin/End: non-default = либо dcscor:Field (path), либо
+			# date ≠ 0001-01-01T00:00:00. Сохраняем строкой — compile auto-detect тип.
+			$pabN = $gItem.SelectSingleNode("dcsset:periodAdditionBegin", $ns)
+			$paeN = $gItem.SelectSingleNode("dcsset:periodAdditionEnd", $ns)
+			$pab = $null; $pae = $null
+			if ($pabN) {
+				$pt = Get-LocalXsiType $pabN
+				$pv = $pabN.InnerText
+				if ($pt -eq 'Field' -or ($pv -and $pv -ne '0001-01-01T00:00:00')) { $pab = $pv }
+			}
+			if ($paeN) {
+				$pt = Get-LocalXsiType $paeN
+				$pv = $paeN.InnerText
+				if ($pt -eq 'Field' -or ($pv -and $pv -ne '0001-01-01T00:00:00')) { $pae = $pv }
+			}
+			$isDefault = (-not $pat -or $pat -eq 'None') -and (-not $gt -or $gt -eq 'Items') -and (-not $pab) -and (-not $pae)
 			if ($isDefault) {
 				$gFields += $gf
 			} else {
 				$obj = [ordered]@{ field = $gf }
 				if ($gt -and $gt -ne 'Items') { $obj['groupType'] = $gt }
 				if ($pat -and $pat -ne 'None') { $obj['periodAdditionType'] = $pat }
+				if ($pab) { $obj['periodAdditionBegin'] = $pab }
+				if ($pae) { $obj['periodAdditionEnd'] = $pae }
 				$gFields += $obj
 			}
 		} else {