1 files changed, 2 insertions, 3 deletions

diff --git a/lib/Postdelay/TimeSpec.hs b/lib/Postdelay/TimeSpec.hs
index f84a196..0736e80 100644
--- a/lib/Postdelay/TimeSpec.hs
+++ b/lib/Postdelay/TimeSpec.hs
@@ -104,9 +104,8 @@ timeZone = label "Timezone" $ (Left <$> numericTimezone) <|> (Right <$> namedTim
 numericTimezone :: StringParser s m => m TimeZone
 numericTimezone = review utcOffset <$> (sign <*> ((^+^) <$> hour <*> minute)) <?> "Numeric timezone"
   where
-    hour = (% Hour) <$> twoDigit
-    minute = (% Minute) <$> twoDigit
-    twoDigit = (\n1 n2 -> fromDigit n1 * 10 + fromDigit n2) <$> digitChar <*> digitChar
+    hour   = (% Hour)   <$> boundedNatural True (0 <=..<= 24)
+    minute = (% Minute) <$> boundedNatural True (0 <=..<  60)
 
 namedTimezone :: (StringParser s m, MonadIO m) => m TZ
 namedTimezone = do