chromeos: Add gdata::util::FormatTimeAsString().

This adds a function for formatting a base::Time as an RFC
3339 date/time, e.g. "2012-07-03T12:30:34.318Z".  This
function complements the existing
gdata::util::GetTimeFromString(), and is needed for a later
contacts-related change.

BUG=128805
TEST=added


Review URL: https://chromiumcodereview.appspot.com/10790124

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@147998 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/gdata/gdata_util.cc

@@ -570,5 +570,14 @@ bool GetTimeFromString(const base::StringPiece& raw_value,
   return true;
 }
 
+std::string FormatTimeAsString(const base::Time& time) {
+  base::Time::Exploded exploded;
+  time.UTCExplode(&exploded);
+  return base::StringPrintf(
+      "%04d-%02d-%02dT%02d:%02d:%02d.%03dZ",
+      exploded.year, exploded.month, exploded.day_of_month,
+      exploded.hour, exploded.minute, exploded.second, exploded.millisecond);
+}
+
 }  // namespace util
 }  // namespace gdata

chrome/browser/chromeos/gdata/gdata_util.h

@@ -11,6 +11,7 @@
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
+#include "base/time.h"
 #include "chrome/browser/chromeos/gdata/gdata_errorcode.h"
 #include "googleurl/src/gurl.h"
 
@@ -101,11 +102,14 @@ bool IsDriveV2ApiEnabled();
 // Returns a PlatformFileError that corresponds to the GDataFileError provided.
 base::PlatformFileError GDataFileErrorToPlatformError(GDataFileError error);
 
-// Returns true when time string is successfully parsed and output as |time|.
-// The time string must be in format yyyy-mm-ddThh:mm:ss.dddTZ (TZ is either
-// '+hh:mm', '-hh:mm', 'Z' (representing UTC) or empty string).
+// Parses an RFC 3339 date/time into a base::Time, returning true on success.
+// The time string must be in the format "yyyy-mm-ddThh:mm:ss.dddTZ" (TZ is
+// either '+hh:mm', '-hh:mm', 'Z' (representing UTC), or an empty string).
 bool GetTimeFromString(const base::StringPiece& raw_value, base::Time* time);
 
+// Formats a base::Time as an RFC 3339 date/time (in UTC).
+std::string FormatTimeAsString(const base::Time& time);
+
 }  // namespace util
 }  // namespace gdata
 

chrome/browser/chromeos/gdata/gdata_util_unittest.cc

@@ -6,6 +6,7 @@
 
 #include "base/file_path.h"
 #include "base/i18n/time_formatting.h"
+#include "base/stringprintf.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/chromeos/system/timezone_settings.h"
@@ -14,7 +15,6 @@
 
 namespace gdata {
 namespace util {
-
 namespace {
 
 std::string FormatTime(const base::Time& time) {
@@ -171,5 +171,11 @@ TEST(GDataUtilTest, GetTimeFromString) {
             FormatTime(test_time));
 }
 
+TEST(GDataUtilTest, FormatTimeAsString) {
+  base::Time::Exploded exploded_time = {2012, 7, 0, 19, 15, 59, 13, 123};
+  base::Time time = base::Time::FromUTCExploded(exploded_time);
+  EXPECT_EQ("2012-07-19T15:59:13.123Z", FormatTimeAsString(time));
+}
+
 }  // namespace util
 }  // namespace gdata