win32: squeeze a few bytes out of strftime

1 files changed, 6 insertions, 4 deletions

diff --git a/win32/mingw.c b/win32/mingw.c
index 4c449514a..f9967f1c4 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -972,9 +972,11 @@ size_t mingw_strftime(char *buf, size_t max, const char *format, const struct tm
         int m;
 
         /*
-         * Emulate the '%e' and '%s' formats that Windows' strftime lacks.
-         * Happily, the string that replaces '%e' is two characters long.
-         * '%s' is a bit more complicated.
+         * Emulate the some formats that Windows' strftime lacks.
+         * - '%e' day of the month with space padding
+         * - '%s' number of seconds since the Unix epoch
+         * - '%z' timezone offset
+         * Also, permit the '-' modifier to omit padding.  Windows uses '#'.
          */
         fmt = xstrdup(format);
         for ( t=fmt; *t; ++t ) {
@@ -1017,7 +1019,7 @@ size_t mingw_strftime(char *buf, size_t max, const char *format, const struct tm
 
                                         hr = offset / 3600;
                                         min = (offset % 3600) / 60;
-                                        sprintf(buffer+1, "%02d%02d", hr, min);
+                                        sprintf(buffer+1, "%04d", hr*100 + min);
                                 }
                                 newfmt = xasprintf("%s%s%s", fmt, buffer, t+2);
                                 free(fmt);