diff --git a/src/CLI.cpp b/src/CLI.cpp
index 01ebac8f1..89a44f881 100644
--- a/src/CLI.cpp
+++ b/src/CLI.cpp
@@ -1345,7 +1345,7 @@ void CLI::findIDs ()
 
           if (terms.size () == 1)
           {
-            if (! digitsOnly (terms[0]))
+            if (! Lexer::isAllDigits (terms[0]))
             {
               is_an_id = false;
               break;
@@ -1366,8 +1366,8 @@ void CLI::findIDs ()
           }
           else if (terms.size () == 2)
           {
-            if (! digitsOnly (terms[0]) ||
-                ! digitsOnly (terms[1]))
+            if (! Lexer::isAllDigits (terms[0]) ||
+                ! Lexer::isAllDigits (terms[1]))
             {
               is_an_id = false;
               break;
@@ -2206,7 +2206,7 @@ bool CLI::isIDSequence (const std::string& raw) const
 ////////////////////////////////////////////////////////////////////////////////
 bool CLI::isID (const std::string& raw) const
 {
-  return digitsOnly (raw);
+  return Lexer::isAllDigits (raw);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/Date.cpp b/src/Date.cpp
index 91bd7c469..69dd376bc 100644
--- a/src/Date.cpp
+++ b/src/Date.cpp
@@ -823,7 +823,7 @@ void Date::operator++ (int)
 ////////////////////////////////////////////////////////////////////////////////
 bool Date::isEpoch (const std::string& input)
 {
-  if (digitsOnly (input) &&
+  if (Lexer::isAllDigits (input) &&
       input.length () <= 10 )
   {
     _t = (time_t) atoi (input.c_str ());
diff --git a/src/Duration.cpp b/src/Duration.cpp
index fc98fecb4..28de33eb0 100644
--- a/src/Duration.cpp
+++ b/src/Duration.cpp
@@ -107,7 +107,7 @@ Duration::Duration (time_t input)
 Duration::Duration (const std::string& input)
 : _secs (0)
 {
-  if (digitsOnly (input))
+  if (Lexer::isAllDigits (input))
   {
     time_t value = (time_t) strtol (input.c_str (), NULL, 10);
     if (value == 0 || value > 60)
diff --git a/src/commands/CmdCalendar.cpp b/src/commands/CmdCalendar.cpp
index 3a00fffd3..232f7b446 100644
--- a/src/commands/CmdCalendar.cpp
+++ b/src/commands/CmdCalendar.cpp
@@ -120,11 +120,11 @@ int CmdCalendar::execute (std::string& output)
       argWholeYear = true;
 
     // YYYY.
-    else if (digitsOnly (*arg) && arg->length () == 4)
+    else if (Lexer::isAllDigits (*arg) && arg->length () == 4)
       argYear = strtol (arg->c_str (), NULL, 10);
 
     // MM.
-    else if (digitsOnly (*arg) && arg->length () <= 2)
+    else if (Lexer::isAllDigits (*arg) && arg->length () <= 2)
     {
       argMonth = strtol (arg->c_str (), NULL, 10);
       if (argMonth < 1 || argMonth > 12)
diff --git a/src/text.cpp b/src/text.cpp
index cf9c9ada3..857d0d259 100644
--- a/src/text.cpp
+++ b/src/text.cpp
@@ -479,16 +479,6 @@ bool nontrivial (const std::string& input)
   return false;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-bool digitsOnly (const std::string& input)
-{
-  for (size_t i = 0; i < input.length (); ++i)
-    if (!isdigit (input[i]))
-      return false;
-
-  return true;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // Override of ispunct, that considers #, $ and @ not to be punctuation.
 //
diff --git a/src/text.h b/src/text.h
index 2e9036648..ae6b300d3 100644
--- a/src/text.h
+++ b/src/text.h
@@ -50,7 +50,6 @@ const std::string str_replace (std::string&, const std::string&, const std::stri
 const std::string str_replace (const std::string&, const std::string&, const std::string&);
 const char* optionalBlankLine ();
 bool nontrivial (const std::string&);
-bool digitsOnly (const std::string&);
 bool isPunctuation (char);
 bool compare (const std::string&, const std::string&, bool sensitive = true);
 bool closeEnough (const std::string&, const std::string&, unsigned int minLength = 0);
diff --git a/test/text.t.cpp b/test/text.t.cpp
index 9cb99bf65..57c33768d 100644
--- a/test/text.t.cpp
+++ b/test/text.t.cpp
@@ -37,7 +37,7 @@ Context context;
 ////////////////////////////////////////////////////////////////////////////////
 int main (int argc, char** argv)
 {
-  UnitTest t (209);
+  UnitTest t (205);
 
   // Ensure environment has no influence.
   unsetenv ("TASKDATA");
@@ -290,12 +290,6 @@ int main (int argc, char** argv)
   t.ok    (nontrivial ("  \t\ta"),                "nontrivial '  \\t\\ta' -> true");
   t.ok    (nontrivial ("a\t\t  "),                "nontrivial 'a\\t\\t  ' -> true");
 
-  // bool digitsOnly (const std::string&);
-  t.ok    (digitsOnly (""),                       "digitsOnly '' -> true");
-  t.ok    (digitsOnly ("0"),                      "digitsOnly '0' -> true");
-  t.ok    (digitsOnly ("123"),                    "digitsOnly '123' -> true");
-  t.notok (digitsOnly ("12fa"),                   "digitsOnly '12fa' -> false");
-
   // bool compare (const std::string&, const std::string&, bool caseless = false);
   // Make sure degenerate cases are handled.
   t.ok    (compare ("", ""),    "'' == ''");