diff --git a/include/timeutils.h b/include/timeutils.h
index 962c1c946..c6a23bebd 100644
--- a/include/timeutils.h
+++ b/include/timeutils.h
@@ -29,10 +29,9 @@ namespace Duration
 	 * seconds. If called with this duration 33,019,565 will be returned.
 	 *
 	 * @param str A string containing a duration.
-	 * @param base The base time to use for leap year calculation.
 	 * @return Either the number of seconds in the duration or 0 on error.
 	 */
-	CoreExport unsigned long From(const std::string& str, time_t base = 0);
+	CoreExport unsigned long From(const std::string& str);
 
 	/** Determines whether a duration string is valid.
 	 * @param str The duration string to check.
@@ -58,7 +57,7 @@ namespace Duration
 	 * @param base The base time to use for leap year calculation.
 	 * @return True if the conversion succeeded; otherwise, false.
 	 */
-	CoreExport bool TryFrom(const std::string& str, unsigned long& duration, time_t base = 0);
+	CoreExport bool TryFrom(const std::string& str, unsigned long& duration);
 }
 
 namespace Time
diff --git a/src/helperfuncs.cpp b/src/helperfuncs.cpp
index c81a9fa0f..eaacee665 100644
--- a/src/helperfuncs.cpp
+++ b/src/helperfuncs.cpp
@@ -403,7 +403,7 @@ static constexpr unsigned int duration_multi[] =
 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 };
 
-bool Duration::TryFrom(const std::string& str, unsigned long& duration, time_t base)
+bool Duration::TryFrom(const std::string& str, unsigned long& duration)
 {
 	unsigned long total = 0;
 	unsigned long subtotal = 0;
@@ -437,7 +437,7 @@ bool Duration::TryFrom(const std::string& str, unsigned long& duration, time_t b
 	return true;
 }
 
-unsigned long Duration::From(const std::string& str, time_t base)
+unsigned long Duration::From(const std::string& str)
 {
 	unsigned long out = 0;
 	Duration::TryFrom(str, out, base);