nobu	2019-01-13 12:31:01 +0900 (Sun, 13 Jan 2019)

  New Revision: 66803

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66803

  Log:
    time.c: do not set utc_offset in vtm_add_offset
    
    * time.c (vtm_add_offset): just add offset to other components
      only.  removed subtraction of utc_offset as it is overwritten
      always immediately in callers.

  Modified files:
    trunk/time.c
Index: time.c
===================================================================
--- time.c	(revision 66802)
+++ time.c	(revision 66803)
@@ -1911,8 +1911,6 @@ vtm_add_offset(struct vtm *vtm, VALUE of https://github.com/ruby/ruby/blob/trunk/time.c#L1911
     int sec, min, hour;
     int day;
 
-    vtm->utc_offset = subv(vtm->utc_offset, off);
-
     if (lt(off, INT2FIX(0))) {
         sign = -1;
         off = neg(off);

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