Support AbslStringify in absl Civil Time types.

PiperOrigin-RevId: 582342910
Change-Id: Iada5420867779ed352d8fb0695ff6d6044acfba2

absl/time/civil_time.h

@@ -462,6 +462,32 @@ std::string FormatCivilTime(CivilDay c);
 std::string FormatCivilTime(CivilMonth c);
 std::string FormatCivilTime(CivilMonth c);
 std::string FormatCivilTime(CivilYear c);
 std::string FormatCivilTime(CivilYear c);
 
 
+// Support for StrFormat(), StrCat(), etc
+template <typename Sink>
+void AbslStringify(Sink& sink, CivilSecond c) {
+  sink.Append(FormatCivilTime(c));
+}
+template <typename Sink>
+void AbslStringify(Sink& sink, CivilMinute c) {
+  sink.Append(FormatCivilTime(c));
+}
+template <typename Sink>
+void AbslStringify(Sink& sink, CivilHour c) {
+  sink.Append(FormatCivilTime(c));
+}
+template <typename Sink>
+void AbslStringify(Sink& sink, CivilDay c) {
+  sink.Append(FormatCivilTime(c));
+}
+template <typename Sink>
+void AbslStringify(Sink& sink, CivilMonth c) {
+  sink.Append(FormatCivilTime(c));
+}
+template <typename Sink>
+void AbslStringify(Sink& sink, CivilYear c) {
+  sink.Append(FormatCivilTime(c));
+}
+
 // absl::ParseCivilTime()
 // absl::ParseCivilTime()
 //
 //
 // Parses a civil-time value from the specified `absl::string_view` into the
 // Parses a civil-time value from the specified `absl::string_view` into the

absl/time/civil_time_test.cc

@@ -19,8 +19,9 @@
 #include <sstream>
 #include <sstream>
 #include <type_traits>
 #include <type_traits>
 
 
-#include "absl/base/macros.h"
 #include "gtest/gtest.h"
 #include "gtest/gtest.h"
+#include "absl/base/macros.h"
+#include "absl/strings/str_format.h"
 
 
 namespace {
 namespace {
 
 
@@ -869,6 +870,23 @@ TEST(CivilTime, ParseEdgeCases) {
   EXPECT_FALSE(absl::ParseLenientCivilTime("9223372036854775808", &y)) << y;
   EXPECT_FALSE(absl::ParseLenientCivilTime("9223372036854775808", &y)) << y;
 }
 }
 
 
+TEST(CivilTime, AbslStringify) {
+  EXPECT_EQ("2015-01-02T03:04:05",
+            absl::StrFormat("%v", absl::CivilSecond(2015, 1, 2, 3, 4, 5)));
+
+  EXPECT_EQ("2015-01-02T03:04",
+            absl::StrFormat("%v", absl::CivilMinute(2015, 1, 2, 3, 4)));
+
+  EXPECT_EQ("2015-01-02T03",
+            absl::StrFormat("%v", absl::CivilHour(2015, 1, 2, 3)));
+
+  EXPECT_EQ("2015-01-02", absl::StrFormat("%v", absl::CivilDay(2015, 1, 2)));
+
+  EXPECT_EQ("2015-01", absl::StrFormat("%v", absl::CivilMonth(2015, 1)));
+
+  EXPECT_EQ("2015", absl::StrFormat("%v", absl::CivilYear(2015)));
+}
+
 TEST(CivilTime, OutputStream) {
 TEST(CivilTime, OutputStream) {
   absl::CivilSecond cs(2016, 2, 3, 4, 5, 6);
   absl::CivilSecond cs(2016, 2, 3, 4, 5, 6);
   {
   {