# Time#to\_s format

**URL:** <https://www.ruby-forum.com/t/time-to-s-format/87702>\
**Category:** Development\
**Created:** [March 5, 2007, 10:45am UTC](https://www.ruby-forum.com/t/time-to-s-format/87702 "2007-03-05T10:45:00Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![OHARA\_Shigeki](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/c37758/32.png) [@OHARA\_Shigeki](https://www.ruby-forum.com/u/OHARA_Shigeki)\
**Post date:** [March 5, 2007, 10:45am UTC](https://www.ruby-forum.com/t/time-to-s-format/87702/1 "2007-03-05T10:45:00Z")

</div>

e$BBg86$G$9!#e(B

Ruby 1.8.6 e$B$+$ie(B Time#to\_s e$B$N7A\<0$,e(B  
RFC 2822 e$B=`5r$KJQ99$K$J$k$h$&$J$N$G$9$,!"e(B  
e$B$3$N7A\<0$,4V0c$C$F$$$k$h$&$K;W$$$^$9!#e(B

From: “NARUSE, Yui” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Subject: [ruby-dev:29467] Re: [ruby-cvs:17256] ruby, ruby: \* time.c  
(time\_to\_s): generate RFC822 style date string.  
Message-ID: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Date: Mon, 4 Sep 2006 18:33:50 +0900

> e$B$K$J$C$F$$$^$9$,!"e(B  
> p Time.now, Time.now.utc  
> Mon, Sep 04 2006 18:12:44 +0900  
> Mon, Sep 04 2006 09:12:44 UT  
> e$B$,@5$7$$$+$H!#e(B

RFC 2822 e$B$Ne(B 3.3. Date and Time Specification e$B$K$h$k$H!"e(B

date = day month year

e$B$,@5$7$$$h$&$G$9!#e(B

* * *

OHARA Shigeki (e$BBg86e(B e$B=E\<ye(B) [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

---

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**Author:** ![OHARA\_Shigeki](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/c37758/32.png) [@OHARA\_Shigeki](https://www.ruby-forum.com/u/OHARA_Shigeki)\
**Post date:** [March 5, 2007, 11:28am UTC](https://www.ruby-forum.com/t/time-to-s-format/87702/2 "2007-03-05T11:28:05Z")

</div>

At Mon, 5 Mar 2007 18:44:19 +0900,  
OHARA Shigeki wrote:

> Ruby 1.8.6 から Time#to\_s の形式が  
> RFC 2822 æº–æ‹ ã«å¤‰æ›´ã«ãªã‚‹ã‚ˆã†ãªã®ã§ã™ãŒã€  
> この形式が間違っているように思います。  
> (snip)  
> RFC 2822 の 3.3. Date and Time Specification によると、
> 
> date = day month year
> 
> が正しいようです。

　確かにその通りですね。修正します。

% /usr/local/bin/ruby -v -rtime -e ‘Time.rfc2822(Time.now.to\_s)’  
ruby 1.8.6 (2007-03-05 patchlevel 0) [i686-darwin8.8.3]  
/usr/local/lib/ruby/1.8/time.rb:296:in `rfc2822’: not RFC 2822 compliant  
date: “Mon, Mar 05 2007 19:25:08 +0900” (ArgumentError)  
from -e:1

　ちょっと情けない…。

–  
/  
/\_\_ \_\_ [Akinori.org](http://Akinori.org) / [MUSHA.org](http://MUSHA.org)  
/ ) ) ) ) / [FreeBSD.org](http://FreeBSD.org) / [Ruby-lang.org](http://Ruby-lang.org)  
Akinori MUSHA aka / (\_ / ( (\_\_( @ [iDaemons.org](http://iDaemons.org) / and.or.jp

“Different eyes see different things,  
Different hearts beat on different strings –  
But there are times for you and me when all such things agree”

---

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**Author:** ![OHARA\_Shigeki](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/c37758/32.png) [@OHARA\_Shigeki](https://www.ruby-forum.com/u/OHARA_Shigeki)\
**Post date:** [March 5, 2007, 2:15pm UTC](https://www.ruby-forum.com/t/time-to-s-format/87702/3 "2007-03-05T14:15:33Z")

</div>

　ところで、 1.8.6 の Time#to\_s を RFC 2822 形式にするというのは  
最終決定でいいのでしょうか。1.9 ではまた違う形式になっていますが、  
これは変更し忘れですよね？

　1.9 でまた変えるくらいなら、 1.8.6 で変えるのは避けたいのですが。

–  
/  
/\_\_ \_\_ [Akinori.org](http://Akinori.org) / [MUSHA.org](http://MUSHA.org)  
/ ) ) ) ) / [FreeBSD.org](http://FreeBSD.org) / [Ruby-lang.org](http://Ruby-lang.org)  
Akinori MUSHA aka / (\_ / ( (\_\_( @ [iDaemons.org](http://iDaemons.org) / and.or.jp

“Different eyes see different things,  
Different hearts beat on different strings –  
But there are times for you and me when all such things agree”

---

<div class="post-metadata">

**Author:** ![OHARA\_Shigeki](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/c37758/32.png) [@OHARA\_Shigeki](https://www.ruby-forum.com/u/OHARA_Shigeki)\
**Post date:** [March 6, 2007, 7:38am UTC](https://www.ruby-forum.com/t/time-to-s-format/87702/4 "2007-03-06T07:38:49Z")

</div>

At Mon, 5 Mar 2007 23:27:33 +0900,  
matz wrote:

> Timezone表現の部分を数値表現にすることだけだったのですが、  
> Timezon表現の位置について悩んでいるうちにそのままRFC2822形式  
> になってしまったという経緯があります(当初、RFC2822とctime形  
> 式の違いを十分に認識していなかった)。

　本当に RFC 2822 形式が欲しいならそれ用のメソッド(time.rb の  
Time#rfc2822 なり自作メソッドなり)を使うべきなので、 to\_s が  
RFC 2822 形式である必要はないでしょうね。

　それはさておき、 inspect は usec を含む形式に変えた方がいいん  
じゃないでしょうか。(ctime や RFC 2822 は usec を含められない)

> で、Ruby 1.9ではISO8601形式(ただし区切りのTは使わない)にしよ  
> うと思っています。元々1.8の範囲内では小さな変更にして、1.9の  
> ときに大きな変更にしようと思っていましたから。

　1.9 の rdoc ã¯å®Ÿè£…ã‚’åæ˜ ã—ã¦ã„ã¾ã›ã‚“ã€‚ä»Šã®ä»•æ§˜ã¯ ISO 8601  
でも YAML æº–æ‹ ã§ã‚‚ãªãä¸­é€”åŠç«¯ãªã®ã§ã€ã“ã®æ©Ÿä¼šã«å®Ÿè£…ã‚‚å¤‰ãˆã¦  
しまった方がいいと思いますが。

# Index: time.c

— time.c (revision 11998)  
+++ time.c (working copy)  
@@ -1185,11 +1185,14 @@

- 

```
time.to_s => string

```

- 
- Returns a string representing _time_. Equivalent to calling

- 
  - `Time#strftime` with a format string of  
```%a`

- 
  - `%b` `%d` `%H:%M:%S`

- 
  - `%Z` `%Y`‘’.

- 
  - `Time#strftime` with a format string of

- 
  - ```%Y-%m-%d` `%H:%M:%S` `%z`‘’

- 
  - for local times and

- 
  - ```%Y-%m-%d` `%H:%M:%S` `UTC`‘’

- 
  - for UTC times.
  - 

- 
  - 

```
Time.now.to_s #=> "Wed Apr 09 08:56:04 CDT 2003"

```

- 
  - 

```
Time.now.to_s #=> "2003-04-09 08:56:04 -0500"

```

- 
  - 

```
Time.now.utc.to_s #=> "2003-04-09 13:56:04 UTC"

```

\*/

static VALUE

> というわけで、今さらではありますが、私は
> 
> - 1.8の範囲内ではRFC2822は採用せず、Timezoneを数値表現にす  
> るだけ(つまり、1.8.5の状態に戻す)
> 
> - 1.9でISO8601形式に
> 
> というのを提案します。が、すっかり忘れて放置していたのは私で  
> すし、もう時期も時期ですから、最終的な判断はknuさんに任せま  
> す。

　変えるに足る理由が見つからないので、 1.8.6 は 1.8.5 の仕様に  
戻そうと思います。もっと早く突っ込んでおけばよかった。

–  
/  
/\_\_ \_\_ [Akinori.org](http://Akinori.org) / [MUSHA.org](http://MUSHA.org)  
/ ) ) ) ) / [FreeBSD.org](http://FreeBSD.org) / [Ruby-lang.org](http://Ruby-lang.org)  
Akinori MUSHA aka / (\_ / ( (\_\_( @ [iDaemons.org](http://iDaemons.org) / and.or.jp

“Different eyes see different things,  
Different hearts beat on different strings –  
But there are times for you and me when all such things agree”

---

<div class="post-metadata">

**Author:** ![OHARA\_Shigeki](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/c37758/32.png) [@OHARA\_Shigeki](https://www.ruby-forum.com/u/OHARA_Shigeki)\
**Post date:** [March 5, 2007, 3:28pm UTC](https://www.ruby-forum.com/t/time-to-s-format/87702/5 "2007-03-05T15:28:44Z")

</div>

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

In message “Re: [ruby-dev:30493] Re: Time#to\_s format”  
on Mon, 5 Mar 2007 22:15:13 +0900, “Akinori MUSHA”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|e$B!!$H$3$m$G!"e(B 1.8.6 e$B$Ne(B Time#to\_s e$B$re(B RFC 2822 e$B7A\<0$K$9$k$H$$$&$N$Oe(B  
|e$B:G=\*7hDj$G$$$$$N$G$7$g$&$+!#e(B1.9 e$B$G$O$^$?0c$&7A\<0$K$J$C$F$$$^$9$,!"e(B  
|e$B$3$l$OJQ99$7K:$l$G$9$h$M!)e(B  
|  
|e$B!!e(B1.9 e$B$G$^$?JQ$($k$/$i$$$J$i!"e(B 1.8.6 e$B$GJQ$($k$N$OHr$1$?$$$N$G$9$,!#e(B

e$BFq$7$$$H$3$m$G$9!#;d$N85!9$N0U;W$Oe(Bctimee$BI=8=$G[#Kf@-$,Bg$-$$e(B  
Timezonee$BI=8=$NItJ,$r?tCMI=8=$K$9$k$3$H$@$1$@$C$?$N$G$9$,!“e(B  
Timezone$BI=8=$N0LCV$K$D$$$FG:$s$G$$$k$&$A$K$=$N$^$^e(BRFC2822e$B7A\<0e(B  
e$B$K$J$C$F$7$^$C$?$H$$$&7P0^$,$”$j$^$9e(B(e$BEv=i!"e(BRFC2822e$B$He(Bctimee$B7Ae(B  
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e$B$G!"e(BRuby  
1.9e$B$G$Oe(BISO8601e$B7A\<0e(B(e$B$?$@$76h@Z$j$Ne(BTe$B$O;H$o$J$$e(B)e$B$K$7$he(B  
e$B$&$H;W$C$F$$$^$9!#85!9e(B1.8e$B$NHO0OFb$G$O\>.$5$JJQ99$K$7$F!"e(B1.9e$B$Ne(B  
e$B$H$-$KBg$-$JJQ99$K$7$h$&$H;W$C$F$$$^$7$?$+$i!#e(B

e$B$H$$$&$o$1$G!“:#$5$i$G$O$”$j$^$9$,!";d$Oe(B

- 

1.8e$B$NHO0OFb$G$Oe(BRFC2822e$B$O:NMQ$;$:!"e(BTimezonee$B$r?tCMI=8=$K$9e(B  
e$B$k$@$1e(B(e$B$D$^$j!"e(B1.8.5e$B$N\>uBV$KLa$9e(B)

- 1.9e$B$Ge(BISO8601e$B7A\<0$Ke(B

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e$B$9!#e(B

---

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**Author:** ![OHARA\_Shigeki](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/c37758/32.png) [@OHARA\_Shigeki](https://www.ruby-forum.com/u/OHARA_Shigeki)\
**Post date:** [March 9, 2007, 9:17am UTC](https://www.ruby-forum.com/t/time-to-s-format/87702/6 "2007-03-09T09:17:18Z")

</div>

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

In message “Re: [ruby-dev:30499] Re: Time#to\_s format”  
on Tue, 6 Mar 2007 15:38:38 +0900, “Akinori MUSHA”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|e$B!!$=$l$O$5$F$\*$-!"e(B inspect e$B$Oe(B usec e$B$r4^$`7A\<0$KJQ$($?J}$,$$$$$se(B  
|e$B$8$c$J$$$G$7$g$&$+!#e(B(ctime e$B$de(B RFC 2822 e$B$Oe(B usec e$B$r4^$a$i$l$J$$e(B)

e$B$=$&$G$9$M$(!#e(BYAMLe$B7A\<0$K$“$o$;$k$+$J$”!#e(B

|\> e$B$G!"e(BRuby 1.9e$B$G$Oe(BISO8601e$B7A\<0e(B(e$B$?$@$76h@Z$j$Ne(BTe$B$O;H$o$J$$e(B)e$B$K$7$he(B  
|\> e$B$&$H;W$C$F$$$^$9!#85!9e(B1.8e$B$NHO0OFb$G$O\>.$5$JJQ99$K$7$F!“e(B1.9e$B$Ne(B  
|\> e$B$H$-$KBg$-$JJQ99$K$7$h$&$H;W$C$F$$$^$7$?$+$i!#e(B  
|  
|e$B!!e(B1.9 e$B$Ne(B rdoc e$B$O\<BAu$rH?1G$7$F$$$^$;$s!#:#$N;EMM$Oe(B ISO 8601  
|e$B$G$be(B YAML e$B=`5r$G$b$J$/CfESH\>C\<$J$N$G!”$3$N5!2q$K\<BAu$bJQ$($Fe(B  
|e$B$7$^$C$?J}$,$$$$$H;W$$$^$9$,!#e(B

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