diff --git a/chrono_io.h b/chrono_io.h
index d66a4f2..b370270 100644
--- a/chrono_io.h
+++ b/chrono_io.h
@@ -24,7 +24,7 @@
 // SOFTWARE.
 //
 // Our apologies.  When the previous paragraph was written, lowercase had not yet
-// been invented (that woud involve another several millennia of evolution).
+// been invented (that would involve another several millennia of evolution).
 // We did not mean to shout.
 
 #include <chrono>
diff --git a/date.h b/date.h
index 951bdc2..1fedf7f 100644
--- a/date.h
+++ b/date.h
@@ -25,7 +25,7 @@
 // SOFTWARE.
 //
 // Our apologies.  When the previous paragraph was written, lowercase had not yet
-// been invented (that woud involve another several millennia of evolution).
+// been invented (that would involve another several millennia of evolution).
 // We did not mean to shout.
 
 #include <algorithm>
diff --git a/islamic.h b/islamic.h
index df044a6..b18c493 100644
--- a/islamic.h
+++ b/islamic.h
@@ -24,7 +24,7 @@
 // SOFTWARE.
 //
 // Our apologies.  When the previous paragraph was written, lowercase had not yet
-// been invented (that woud involve another several millennia of evolution).
+// been invented (that would involve another several millennia of evolution).
 // We did not mean to shout.
 
 #include "date.h"
diff --git a/julian.h b/julian.h
index 696be7c..4aac963 100644
--- a/julian.h
+++ b/julian.h
@@ -24,7 +24,7 @@
 // SOFTWARE.
 //
 // Our apologies.  When the previous paragraph was written, lowercase had not yet
-// been invented (that woud involve another several millennia of evolution).
+// been invented (that would involve another several millennia of evolution).
 // We did not mean to shout.
 
 #include "date.h"
diff --git a/tz.cpp b/tz.cpp
index 51644aa..9783dd6 100644
--- a/tz.cpp
+++ b/tz.cpp
@@ -25,15 +25,15 @@
 // SOFTWARE.
 //
 // Our apologies.  When the previous paragraph was written, lowercase had not yet
-// been invented (that woud involve another several millennia of evolution).
+// been invented (that would involve another several millennia of evolution).
 // We did not mean to shout.
 
 #ifdef _WIN32
 // Windows.h will be included directly and indirectly (e.g. by curl).
 // We need to define these macros to prevent Windows.h bringing in
-// more than we need and do it eearly so Windows.h doesn't get included
+// more than we need and do it early so Windows.h doesn't get included
 // without these macros having been defined.
-// min/max macrosinterfere with the C++ versions.
+// min/max macros interfere with the C++ versions.
 #ifndef NOMINMAX
 #define NOMINMAX
 #endif
@@ -585,7 +585,7 @@ sort_zone_mappings(std::vector<date::detail::timezone_mapping>& mappings)
     });
 }
 
-// This routine maps Win32 OS error codes to readable text strngs.
+// This routine maps Win32 OS error codes to readable text strings.
 static
 std::string
 get_win32_message(DWORD error_code)
@@ -2617,7 +2617,7 @@ extract_gz_file(const std::string& version, const std::string& gz_file,
 
 #if USE_SHELL_API
     // When using shelling out with std::system() extra quotes are required around the
-    // whole command. It's weird but neccessary it seems, see:
+    // whole command. It's weird but necessary it seems, see:
     // http://stackoverflow.com/q/27975969/576911
 
     cmd = "\"" + cmd + "\"";
diff --git a/tz.h b/tz.h
index 4cd1d1e..ce73f7e 100644
--- a/tz.h
+++ b/tz.h
@@ -25,16 +25,16 @@
 // SOFTWARE.
 //
 // Our apologies.  When the previous paragraph was written, lowercase had not yet
-// been invented (that woud involve another several millennia of evolution).
+// been invented (that would involve another several millennia of evolution).
 // We did not mean to shout.
 
 // Get more recent database at http://www.iana.org/time-zones
 
 // The notion of "current timezone" is something the operating system is expected to "just
 // know". How it knows this is system specific. It's often a value set by the user at OS
-// intallation time and recorded by the OS somewhere. On Linux and Mac systems the current
+// installation time and recorded by the OS somewhere. On Linux and Mac systems the current
 // timezone name is obtained by looking at the name or contents of a particular file on
-// disk. On Windows the current timzeone name comes from the registry. In either method,
+// disk. On Windows the current timezone name comes from the registry. In either method,
 // there is no guarantee that the "native" current timezone name obtained will match any
 // of the "Standard" names in this library's "database". On Linux, the names usually do
 // seem to match so mapping functions to map from native to "Standard" are typically not
diff --git a/tz_private.h b/tz_private.h
index e796e9c..fe821f1 100644
--- a/tz_private.h
+++ b/tz_private.h
@@ -24,7 +24,7 @@
 // SOFTWARE.
 //
 // Our apologies.  When the previous paragraph was written, lowercase had not yet
-// been invented (that woud involve another several millennia of evolution).
+// been invented (that would involve another several millennia of evolution).
 // We did not mean to shout.
 
 #if !defined(_MSC_VER) || (_MSC_VER >= 1900)
@@ -124,7 +124,7 @@ public:
 // A Rule specifies one or more set of datetimes without using an offset.
 // Multiple dates are specified with multiple years.  The years in effect
 // go from starting_year_ to ending_year_, inclusive.  starting_year_ <=
-// ending_year_. save_ is ineffect for times from the specified time
+// ending_year_. save_ is in effect for times from the specified time
 // onward, including the specified time. When the specified time is
 // local, it uses the save_ from the chronologically previous Rule, or if
 // there is none, 0.