On Sun, Oct 21, 2012 at 05:40:40PM -0400, Andrew Dunstan wrote:
>
> I'm not sure if this has come up before.
>
> A client was just finding difficulties because to_char() doesn't
> support formatting the timezone part of a timestamptz numerically
> (i.e. as +-hhmm) instead of using a timezone name. Is there any
> reason for that? Would it be something worth having?
Great idea! I have developed the attached patch to do this:
test=> SELECT to_char(current_timestamp, 'OF');
to_char
---------
-04
(1 row)
test=> SELECT to_char(current_timestamp, 'TMOF');
to_char
---------
-04
(1 row)
test=> SET timezone = 'Asia/Calcutta';
SET
test=> SELECT to_char(current_timestamp, 'OF');
to_char
---------
+05:30
(1 row)
test=> SELECT to_char(current_timestamp, 'FMOF');
to_char
---------
+5:30
(1 row)
I went with the optional colon and minutes because this is how we output
it:
test=> SELECT current_timestamp;
now
-------------------------------
2013-06-28 22:02:24.773587-04
---
(1 row)
test=> set timezone = 'Asia/Calcutta';
SET
test=> SELECT current_timestamp;
now
----------------------------------
2013-06-29 07:32:29.157565+05:30
------
(1 row)
--
Bruce Momjian <br...@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
new file mode 100644
index 7c009d8..5765ddf
*** a/doc/src/sgml/func.sgml
--- b/doc/src/sgml/func.sgml
*************** SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1
*** 5645,5650 ****
--- 5645,5654 ----
<entry><literal>tz</literal></entry>
<entry>lower case time-zone name</entry>
</row>
+ <row>
+ <entry><literal>OF</literal></entry>
+ <entry>time-zone offset</entry>
+ </row>
</tbody>
</tgroup>
</table>
diff --git a/src/backend/utils/adt/formatting.c b/src/backend/utils/adt/formatting.c
new file mode 100644
index 7b85406..4c272ef
*** a/src/backend/utils/adt/formatting.c
--- b/src/backend/utils/adt/formatting.c
*************** typedef enum
*** 600,605 ****
--- 600,606 ----
DCH_MS,
DCH_Month,
DCH_Mon,
+ DCH_OF,
DCH_P_M,
DCH_PM,
DCH_Q,
*************** static const KeyWord DCH_keywords[] = {
*** 746,751 ****
--- 747,753 ----
{"MS", 2, DCH_MS, TRUE, FROM_CHAR_DATE_NONE},
{"Month", 5, DCH_Month, FALSE, FROM_CHAR_DATE_GREGORIAN},
{"Mon", 3, DCH_Mon, FALSE, FROM_CHAR_DATE_GREGORIAN},
+ {"OF", 2, DCH_OF, FALSE, FROM_CHAR_DATE_NONE}, /* O */
{"P.M.", 4, DCH_P_M, FALSE, FROM_CHAR_DATE_NONE}, /* P */
{"PM", 2, DCH_PM, FALSE, FROM_CHAR_DATE_NONE},
{"Q", 1, DCH_Q, TRUE, FROM_CHAR_DATE_NONE}, /* Q */
*************** static const int DCH_index[KeyWord_INDEX
*** 874,880 ****
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, DCH_A_D, DCH_B_C, DCH_CC, DCH_DAY, -1,
! DCH_FX, -1, DCH_HH24, DCH_IDDD, DCH_J, -1, -1, DCH_MI, -1, -1,
DCH_P_M, DCH_Q, DCH_RM, DCH_SSSS, DCH_TZ, DCH_US, -1, DCH_WW, -1, DCH_Y_YYY,
-1, -1, -1, -1, -1, -1, -1, DCH_a_d, DCH_b_c, DCH_cc,
DCH_day, -1, DCH_fx, -1, DCH_hh24, DCH_iddd, DCH_j, -1, -1, DCH_mi,
--- 876,882 ----
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, DCH_A_D, DCH_B_C, DCH_CC, DCH_DAY, -1,
! DCH_FX, -1, DCH_HH24, DCH_IDDD, DCH_J, -1, -1, DCH_MI, -1, DCH_OF,
DCH_P_M, DCH_Q, DCH_RM, DCH_SSSS, DCH_TZ, DCH_US, -1, DCH_WW, -1, DCH_Y_YYY,
-1, -1, -1, -1, -1, -1, -1, DCH_a_d, DCH_b_c, DCH_cc,
DCH_day, -1, DCH_fx, -1, DCH_hh24, DCH_iddd, DCH_j, -1, -1, DCH_mi,
*************** DCH_to_char(FormatNode *node, bool is_in
*** 2502,2507 ****
--- 2504,2519 ----
s += strlen(s);
}
break;
+ case DCH_OF:
+ INVALID_FOR_INTERVAL;
+ sprintf(s, "%+0*ld", S_FM(n->suffix) ? 0 : 3, tm->tm_gmtoff / 3600);
+ s += strlen(s);
+ if (tm->tm_gmtoff % 3600 != 0)
+ {
+ sprintf(s, ":%02ld", (tm->tm_gmtoff % 3600) / 60);
+ s += strlen(s);
+ }
+ break;
case DCH_A_D:
case DCH_B_C:
INVALID_FOR_INTERVAL;
*************** DCH_from_char(FormatNode *node, char *in
*** 2915,2923 ****
break;
case DCH_tz:
case DCH_TZ:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
! errmsg("\"TZ\"/\"tz\" format patterns are not supported in to_date")));
case DCH_A_D:
case DCH_B_C:
case DCH_a_d:
--- 2927,2936 ----
break;
case DCH_tz:
case DCH_TZ:
+ case DCH_OF:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
! errmsg("\"TZ\"/\"tz\"/\"OF\" format patterns are not supported in to_date")));
case DCH_A_D:
case DCH_B_C:
case DCH_a_d:
--
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