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-rw-r--r--absl/time/format_test.cc9
-rw-r--r--absl/time/internal/cctz/include/cctz/civil_time_detail.h10
2 files changed, 13 insertions, 6 deletions
diff --git a/absl/time/format_test.cc b/absl/time/format_test.cc
index 40f4c24633cc..ac8d5ea303ac 100644
--- a/absl/time/format_test.cc
+++ b/absl/time/format_test.cc
@@ -394,7 +394,12 @@ TEST(FormatParse, RoundTrip) {
   // work. On Windows, `absl::ParseTime()` falls back to std::get_time() which
   // appears to fail on "%c" (or at least on the "%c" text produced by
   // `strftime()`). This makes it fail the round-trip test.
-#ifndef _MSC_VER
+  //
+  // Under the emscripten compiler `absl::ParseTime() falls back to
+  // `strptime()`, but that ends up using a different definition for "%c"
+  // compared to `strftime()`, also causing the round-trip test to fail
+  // (see https://github.com/kripken/emscripten/pull/7491).
+#if !defined(_MSC_VER) && !defined(__EMSCRIPTEN__)
   // Even though we don't know what %c will produce, it should roundtrip,
   // but only in the 0-offset timezone.
   {
@@ -403,7 +408,7 @@ TEST(FormatParse, RoundTrip) {
     EXPECT_TRUE(absl::ParseTime("%c", s, &out, &err)) << s << ": " << err;
     EXPECT_EQ(in, out);
   }
-#endif  // _MSC_VER
+#endif  // !_MSC_VER && !__EMSCRIPTEN__
 }
 
 TEST(FormatParse, RoundTripDistantFuture) {
diff --git a/absl/time/internal/cctz/include/cctz/civil_time_detail.h b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
index d7f72717ece2..855958ecb049 100644
--- a/absl/time/internal/cctz/include/cctz/civil_time_detail.h
+++ b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
@@ -506,9 +506,11 @@ enum class weekday {
 };
 
 CONSTEXPR_F weekday get_weekday(const civil_day& cd) noexcept {
-  CONSTEXPR_D weekday k_weekday_by_sun_off[7] = {
-      weekday::sunday,     weekday::monday,    weekday::tuesday,
-      weekday::wednesday,  weekday::thursday,  weekday::friday,
+  CONSTEXPR_D weekday k_weekday_by_mon_off[13] = {
+      weekday::monday,    weekday::tuesday,  weekday::wednesday,
+      weekday::thursday,  weekday::friday,   weekday::saturday,
+      weekday::sunday,    weekday::monday,   weekday::tuesday,
+      weekday::wednesday, weekday::thursday, weekday::friday,
       weekday::saturday,
   };
   CONSTEXPR_D int k_weekday_offsets[1 + 12] = {
@@ -517,7 +519,7 @@ CONSTEXPR_F weekday get_weekday(const civil_day& cd) noexcept {
   year_t wd = 2400 + (cd.year() % 400) - (cd.month() < 3);
   wd += wd / 4 - wd / 100 + wd / 400;
   wd += k_weekday_offsets[cd.month()] + cd.day();
-  return k_weekday_by_sun_off[(wd % 7 + 7) % 7];
+  return k_weekday_by_mon_off[wd % 7 + 6];
 }
 
 ////////////////////////////////////////////////////////////////////////