Correct buffer growth when formatting time (#367)

test/format-test.cc

@@ -60,7 +60,6 @@ lconv *localeconv() {
 }
 
 #include "fmt/format.h"
-#include "fmt/time.h"
 
 #include "util.h"
 #include "mock-allocator.h"
@@ -1551,15 +1550,6 @@ TEST(FormatTest, Variadic) {
   EXPECT_EQ(L"abc1", format(L"{}c{}", L"ab", 1));
 }
 
-TEST(FormatTest, Time) {
-  std::tm tm = std::tm();
-  tm.tm_year = 116;
-  tm.tm_mon  = 3;
-  tm.tm_mday = 25;
-  EXPECT_EQ("The date is 2016-04-25.",
-            fmt::format("The date is {:%Y-%m-%d}.", tm));
-}
-
 template <typename T>
 std::string str(const T &value) {
   return fmt::format("{}", value);