diff --git a/src/pricehist/format.py b/src/pricehist/format.py
index c16857f..36bb023 100644
--- a/src/pricehist/format.py
+++ b/src/pricehist/format.py
@@ -9,6 +9,9 @@ class Format:
     symbol: str = "rightspace"
     datesep: str = "-"
 
+    def format_date(self, date):
+        return str(date).replace("-", self.datesep)
+
     def format_quote_amount(self, quote, amount):
         formatted_amount = self.format_num(amount)
 
diff --git a/src/pricehist/outputs/beancount.py b/src/pricehist/outputs/beancount.py
index ebe33ec..958b62b 100644
--- a/src/pricehist/outputs/beancount.py
+++ b/src/pricehist/outputs/beancount.py
@@ -11,7 +11,7 @@ class Beancount(BaseOutput):
             # TODO warn if fmt settings make an invalid number (not . for decimal)
             # TODO warn if fmt settings make an invalid quote (not right/rightspace)
 
-            date = str(price.date).replace("-", fmt.datesep)
+            date = fmt.format_date(price.date)
             lines.append(f"{date} price {series.base} {quote_amount}")
         return "\n".join(lines) + "\n"
 
diff --git a/src/pricehist/outputs/csv.py b/src/pricehist/outputs/csv.py
index b34aacb..7921a8b 100644
--- a/src/pricehist/outputs/csv.py
+++ b/src/pricehist/outputs/csv.py
@@ -7,7 +7,7 @@ class CSV(BaseOutput):
     def format(self, series, source=None, fmt=Format()):
         lines = ["date,base,quote,amount,source,type"]
         for price in series.prices:
-            date = str(price.date).replace("-", fmt.datesep)
+            date = fmt.format_date(price.date)
             amount = fmt.format_num(price.amount)
             line = ",".join(
                 [date, series.base, series.quote, amount, source.id(), series.type]
diff --git a/src/pricehist/outputs/gnucashsql.py b/src/pricehist/outputs/gnucashsql.py
index bd29b17..efca147 100644
--- a/src/pricehist/outputs/gnucashsql.py
+++ b/src/pricehist/outputs/gnucashsql.py
@@ -14,7 +14,7 @@ class GnuCashSQL(BaseOutput):
 
         values_parts = []
         for price in series.prices:
-            date = f"{price.date} {fmt.time}"
+            date = f"{fmt.format_date(price.date)} {fmt.time}"
             m = hashlib.sha256()
             m.update(
                 "".join(
diff --git a/src/pricehist/outputs/ledger.py b/src/pricehist/outputs/ledger.py
index b514e71..f69fbcc 100644
--- a/src/pricehist/outputs/ledger.py
+++ b/src/pricehist/outputs/ledger.py
@@ -7,7 +7,7 @@ class Ledger(BaseOutput):
     def format(self, series, source=None, fmt=Format()):
         lines = []
         for price in series.prices:
-            date = str(price.date).replace("-", fmt.datesep)
+            date = fmt.format_date(price.date)
             quote_amount = fmt.format_quote_amount(series.quote, price.amount)
             lines.append(f"P {date} {fmt.time} {series.base} {quote_amount}")
         return "\n".join(lines) + "\n"