# \[feature:trunk\] %:z and %::z for strftime

**URL:** <https://www.ruby-forum.com/t/feature-trunk-z-and-z-for-strftime/191202>\
**Category:** Development\
**Created:** [July 7, 2010, 2:54pm UTC](https://www.ruby-forum.com/t/feature-trunk-z-and-z-for-strftime/191202 "2010-07-07T14:54:35Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [July 7, 2010, 2:54pm UTC](https://www.ruby-forum.com/t/feature-trunk-z-and-z-for-strftime/191202/1 "2010-07-07T14:54:35Z")

</div>

strftime e$B$Ge(B %:z e$B$He(B %::z  
e$B$H$$$&;XDj$r2DG=$K$9$k$N$O$I$&$G$7$g$&$+!#e(B

% ./ruby -e ‘p Time.now.strftime("%z %:z %::z")’  
“+0900 +09:00 +09:00:00”

e$B;~:9$r%U%)!\<%^%C%H$9$k$N$K8=:\_$Oe(B %z e$B$,$"$j$^$9$,!"$3$l$Oe(B  
+hhmm e$B$H$$$&7A$G$9!#e(B  
e$B$3$l$Oe(B RFC 822  
e$B7A\<0$N;~9o$rI=8=$9$k$K$O$A$g$&$I$$$$$N$G$9$,!“e(B  
XML Schema e$B$de(B RFC 3339 e$B$de(B W3CDTF  
e$B$G;H$&!”%3%m%s$,F~$C$?e(B +hh:mm e$B$H$$$&e(B  
e$B7A\<0$H$O9g$$$^$;$s!#e(B

e$B$=$7$F!":G6aCN$C$?$N$G$9$,!“e(BGNU coreutils e$B$Ne(B date e$B$K$Oe(B  
%:z e$B$H$$$&;XDj$Ge(B  
+hh:mm e$B$H$$$&7A\<0$r@8@.$9$k5!G=$,$”$j$^$9!#e(B  
e$B$^$?!"%3%m%s$r$U$?$D$K$7$Fe(B %::z e$B$H$9$k$He(B +hh:mm:ss  
e$B$HIC$^$G@8@.$7$^$9!#e(B

e$B$H$$$&$o$1$G!"e(BRuby e$B$G$be(B %:z e$B$He(B %::z  
e$B$r%5%]!\<%H$9$k$N$O$I$&$G$7$g$&!#e(B

e$B$J$\*!"%3%m%s$,F~$C$?7A\<0$O$=$NJ8;zNs\<+BN$r8+$F;~9o$NN`$G$"$k$3$H$,$o$+$k$N$Ge(B  
e$B4V0c$$$,5/$-$K$/$/!"$3$N7?\<0$O$=$l\<+BNNI$$$b$N$@$H;W$$$^$9!#e(B

# % svn diff --diff-cmd diff -x ‘-u -p’ Index: time.c

— time.c (revision 28563)  
+++ time.c (working copy)  
@@ -4346,7 +4346,9 @@ strftimev(const char \*fmt, VALUE time)

- %X - Preferred representation for the time alone, no date
- %y - Year without a century (00…99)
- %Y - Year with century

- 
  - %z - Time zone as hour offset from UTC (e.g. +0900)

- 
  - %z - Time zone as hour and minute offset from UTC (e.g. +0900)

- 
  - 

```
       %:z - hour and minute offset from UTC with a colon (e.g. 

```

+09:00)

- 
  - 

```
       %::z - hour, minute and second offset from UTC (e.g. 

```

+09:00:00)

- %Z - Time zone name
- %% - Literal ``%’’ character
- 

# Index: strftime.c

— strftime.c (revision 28563)  
+++ strftime.c (working copy)  
@@ -215,7 +215,7 @@ rb\_strftime\_with\_timespec(char _s, size\_  
 #endif  
 #endif /_ HAVE\_TM\_NAME _/  
 #endif /_ HAVE\_TM\_ZONE \*/

- int precision, flags;

- int precision, flags, colons;  
char padding;  
enum {LEFT, CHCASE, LOWER, UPPER, LOCALE\_O, LOCALE\_E};  
#define BIT\_OF(n) (1U\<\<(n))  
@@ -348,6 +348,7 @@ rb\_strftime\_with\_timespec(char \*s, size\_  
precision = -1;  
flags = 0;  
padding = 0;
- 

```
           colons = 0;

```

again:  
switch (\*++format) {  
case ‘\0’:  
@@ -530,13 +531,31 @@ rb\_strftime\_with\_timespec(char \*s, size\_  
\* us that muck around with various message processors.  
_/  
case ‘z’: /_ time zone offset east of GMT e.g. -0600 \*/

- 

```
 if (precision < 4) precision = 4;

```

- 

```
 NEEDS(precision + 1);

```

- 

```
                   switch (colons) {

```

- 

```
                     case 0: /* %z -> +hhmm */

```

- 

```
                       precision = precision <= 5 ? 2 : 

```

precision-3;

- 

```
                       NEEDS(precision + 3);

```

- 

```
                       break;

```

- 
- 

```
                     case 1: /* %:z -> +hh:mm */

```

- 

```
                       precision = precision <= 5 ? 2 : 

```

precision-3;

- 

```
                       NEEDS(precision + 4);

```

- 

```
                       break;

```

- 
- 

```
                     case 2: /* %::z -> +hh:mm:ss */

```

- 

```
                       precision = precision <= 5 ? 2 : 

```

precision-3;

- 

```
                       NEEDS(precision + 7);

```

- 

```
                       break;

```

- 
- 

```
                     default:

```

- 

```
                       format--;

```

- 

```
                       goto unknown;

```

- 

```
                   }
 if (gmt) {
   off = 0;
 }
 else {

```

- 

```
   off = NUM2LONG(rb_funcall(quo(vtm->utc_offset, INT2FIX(60)),

```

rb\_intern(“round”), 0));

- 

```
   off = NUM2LONG(rb_funcall(vtm->utc_offset, rb_intern("round"), 

```

0));  
#if 0  
#ifdef HAVE\_TM\_NAME  
/\*  
@@ -583,11 +602,22 @@ rb\_strftime\_with\_timespec(char \*s, size\_  
} else {  
\*s++ = ‘+’;  
}

- 

```
 off = off/60*100 + off%60;

```

- 

```
 i = snprintf(s, endp - s, (padding == ' ' ? "%*ld" : "%.*ld"),

```

- 

```
        precision - (precision > 4), off);

```

- 

```
 i = snprintf(s, endp - s, (padding == ' ' ? "%*ld" : "%.*ld"),

```

precision, off / 3600);

- 

```
 if (i < 0) goto err;

```

- 

```
 s += i;

```

- 

```
                   off = off % 3600;

```

- 

```
                   if (1 <= colons)

```

- 

```
                       *s++ = ':';

```

- 

```
 i = snprintf(s, endp - s, "%02d", off / 60);
 if (i < 0) goto err;
 s += i;

```

- 

```
                   off = off % 60;

```

- 

```
                   if (2 <= colons) {

```

- 

```
                       *s++ = ':';

```

- 

```
                       i = snprintf(s, endp - s, "%02d", off);

```

- 

```
                       if (i < 0) goto err;

```

- 

```
                       s += i;

```

- 

```
                   }
 continue;

```

#endif /\* MAILHEADER\_EXT \*/

@@ -839,6 +869,11 @@ rb\_strftime\_with\_timespec(char \*s, size\_  
padding = ’ ';  
goto again;

- case ‘:’:
- 

```
 FLAG_FOUND();

```

- 

```
                   colons++;

```

- 

```
 goto again;

```

- case ‘0’:  
padding = ‘0’;  
case ‘1’: case ‘2’: case ‘3’: case ‘4’:

---

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [July 7, 2010, 6:26pm UTC](https://www.ruby-forum.com/t/feature-trunk-z-and-z-for-strftime/191202/2 "2010-07-07T18:26:02Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:41841] [feature:trunk] %:z and %::z for  
strftime”  
on Wed, 7 Jul 2010 21:53:26 +0900, Tanaka A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|strftime e$B$Ge(B %:z e$B$He(B %::z e$B$H$$$&;XDj$r2DG=$K$9$k$N$O$I$&$G$7$g$&$+!#e(B  
|  
| % ./ruby -e ‘p Time.now.strftime(“%z %:z %::z”)’  
| “+0900 +09:00 +09:00:00”  
|  
|e$B;~:9$r%U%)!\<%^%C%H$9$k$N$K8=:\_$Oe(B %z e$B$,$“$j$^$9$,!”$3$l$Oe(B +hhmm e$B$H$$$&7A$G$9!#e(B  
|e$B$3$l$Oe(B RFC 822 e$B7A\<0$N;~9o$rI=8=$9$k$K$O$A$g$&$I$$$$$N$G$9$,!“e(B  
|XML Schema e$B$de(B RFC 3339 e$B$de(B W3CDTF e$B$G;H$&!”%3%m%s$,F~$C$?e(B +hh:mm e$B$H$$$&e(B  
|e$B7A\<0$H$O9g$$$^$;$s!#e(B  
|  
|e$B$=$7$F!“:G6aCN$C$?$N$G$9$,!“e(BGNU coreutils e$B$Ne(B date e$B$K$Oe(B %:z e$B$H$$$&;XDj$Ge(B  
|+hh:mm e$B$H$$$&7A\<0$r@8@.$9$k5!G=$,$”$j$^$9!#e(B  
|e$B$^$?!”%3%m%s$r$U$?$D$K$7$Fe(B %::z e$B$H$9$k$He(B +hh:mm:ss e$B$HIC$^$G@8@.$7$^$9!#e(B  
|  
|e$B$H$$$&$o$1$G!“e(BRuby e$B$G$be(B %:z e$B$He(B %::z e$B$r%5%]!\<%H$9$k$N$O$I$&$G$7$g$&!#e(B  
|  
|e$B$J$\*!”%3%m%s$,F~$C$?7A\<0$O$=$NJ8;zNs\<+BN$r8+$F;~9o$NN`$G$“$k$3$H$,$o$+$k$N$Ge(B  
|e$B4V0c$$$,5/$-$K$/$/!”$3$N7?\<0$O$=$l\<+BNNI$$$b$N$@$H;W$$$^$9!#e(B

trunke$B$K$J$iF~$l$F$b$$$$$s$8$c$J$$$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [July 7, 2010, 11:07pm UTC](https://www.ruby-forum.com/t/feature-trunk-z-and-z-for-strftime/191202/3 "2010-07-07T23:07:37Z")

</div>

e$B%A%1%C%He(B #3547 e$B$,99?7$5$l$^$7$?!#e(B (by Akira T.)

e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B  
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

This issue was solved with changeset r28572.  
Akira, thank you for reporting this issue.  
Your contribution to Ruby is greatly appreciated.  
May Ruby be with you.

* * *

[http://redmine.ruby-lang.org/issues/show/3547](http://redmine.ruby-lang.org/issues/show/3547)