diff --git a/CLAUDE.md b/CLAUDE.md
index e7ff22d..ceb2330 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -314,7 +314,7 @@ IBAN wrapped across continuation lines stays contiguous for a glob to match.
 A new parser must do the same rather than reintroduce a structured field.
 
 **A parser may name its statements, and only uploads use it.** `parser.Namer` is
-optional, like `parser.Warner`: `nlb` names an izpisek `izpisek_YYYY_MM_DD`
+optional, like `parser.Warner`: `nlb` names an izpisek `izpisek_YYYY-MM-DD`
 after its *Datum izpiska*, ported from the `rename_izpiski.py` it replaced, and
 `traderepublic` names a statement `traderepublic_YYYY_MM_DD_YYYY_MM_DD` after
 the period in its header. A name is derived from what the statement says, never
diff --git a/README.md b/README.md
index 2c01211..9a457f3 100644
--- a/README.md
+++ b/README.md
@@ -217,7 +217,7 @@ it does not create one.
 
 Some banks name their downloads unhelpfully, so a parser may name the statement
 instead — lowercase throughout, extension included — and the status line says
-what each file became. An NLB izpisek is saved as `izpisek_YYYY_MM_DD.pdf` after
+what each file became. An NLB izpisek is saved as `izpisek_YYYY-MM-DD.pdf` after
 the *Datum izpiska* in its header, and a Trade Republic statement, which
 downloads as `document-N.pdf`, as `traderepublic_YYYY_MM_DD_YYYY_MM_DD.pdf`
 after the period on its first page (`DATE 01 May 2025 - 31 Jul 2026`). Either
@@ -679,7 +679,7 @@ nothing else to configure — `parser` names one of these and that is all.
 
 | `parser` | Statement | Notes |
 | --- | --- | --- |
-| `nlb` | NLB izpisek PDF | Wrapped descriptions are folded in from continuation lines, and the IBAN column is appended to the description. Uploads are saved as `izpisek_YYYY_MM_DD.pdf` after the statement date. |
+| `nlb` | NLB izpisek PDF | Wrapped descriptions are folded in from continuation lines, and the IBAN column is appended to the description. Uploads are saved as `izpisek_YYYY-MM-DD.pdf` after the statement date. |
 | `traderepublic` | Trade Republic PDF | Handles both the single-line and the stacked layout by measuring column positions. Uploads are saved as `traderepublic_YYYY_MM_DD_YYYY_MM_DD.pdf` after the statement period. |
 | `revolut` | `account-statement*.csv` | Skips non-COMPLETED rows, folds the fee into the amount. |
 
diff --git a/internal/parser/nlb.go b/internal/parser/nlb.go
index b727b14..b820ccf 100644
--- a/internal/parser/nlb.go
+++ b/internal/parser/nlb.go
@@ -65,7 +65,7 @@ func (p *nlbParser) Parse(path string, acc *config.Account) ([]RawTxn, error) {
 	return parseNLBText(text, p.digits)
 }
 
-// StatementName names an izpisek after its statement date, izpisek_YYYY_MM_DD,
+// StatementName names an izpisek after its statement date, izpisek_YYYY-MM-DD,
 // so the folder sorts by date and two downloads of one statement collide.
 func (p *nlbParser) StatementName(path string) (string, error) {
 	text, err := pdfToText(path)
@@ -80,7 +80,7 @@ func nlbStatementName(text string) string {
 	if m == nil {
 		return ""
 	}
-	return fmt.Sprintf("izpisek_%s_%s_%s", m[3], m[2], m[1])
+	return fmt.Sprintf("izpisek_%s-%s-%s", m[3], m[2], m[1])
 }
 
 // parseNLBText holds the whole parser, separated from PDF extraction so it can
diff --git a/internal/parser/nlb_test.go b/internal/parser/nlb_test.go
index 8a2aa56..3fbfb4b 100644
--- a/internal/parser/nlb_test.go
+++ b/internal/parser/nlb_test.go
@@ -117,8 +117,8 @@ func TestParseNLBRejectsMalformedLine(t *testing.T) {
 func TestNLBStatementName(t *testing.T) {
 	header := "                              IZPISEK 001/2026\n" +
 		"   Datum izpiska    31.01.2026          Stran 1\n"
-	if got := nlbStatementName(header + nlbPage); got != "izpisek_2026_01_31" {
-		t.Errorf("name = %q, want izpisek_2026_01_31", got)
+	if got := nlbStatementName(header + nlbPage); got != "izpisek_2026-01-31" {
+		t.Errorf("name = %q, want izpisek_2026-01-31", got)
 	}
 	if got := nlbStatementName(nlbPage); got != "" {
 		t.Errorf("name without a statement date = %q, want none", got)