<div dir="ltr">Hello,<div><br></div><div>I am currently developing a C++ time-zone database parser, building on top of Howard Hinnant's work. I am writing thorough checks.</div><div><br></div><div>One Zone check that I am experimenting with is:</div><div><br></div><div><i>If the <b>FORMAT</b> field contains either a "%s" or a '/' then the <b>RULES</b> field must contain a named rule.</i></div><div><i><br></i></div><div>However line 3840 of the asia file in:</div><div><a href="https://data.iana.org/time-zones/releases/tzdata2021e.tar.gz">https://data.iana.org/time-zones/releases/tzdata2021e.tar.gz</a><br></div><div>fails this check, as highlighted in yellow in the table below.</div><div><br></div><div><table border="0" cellpadding="0" cellspacing="0" width="589" style="border-collapse:collapse;width:443pt">
<colgroup><col width="181" style="width:136pt">
<col width="102" style="width:77pt">
<col width="57" style="width:43pt">
<col width="72" style="width:54pt">
<col width="60" style="width:45pt">
<col width="117" style="width:88pt">
</colgroup><tbody><tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" width="181" style="height:15pt;width:136pt;border:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">#
Tajikistan</td>
<td class="gmail-xl63" width="102" style="border-left:none;width:77pt;border-top:0.5pt solid windowtext;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" width="57" style="border-left:none;width:43pt;border-top:0.5pt solid windowtext;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" width="72" style="border-left:none;width:54pt;border-top:0.5pt solid windowtext;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" width="60" style="border-left:none;width:45pt;border-top:0.5pt solid windowtext;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" width="117" style="border-left:none;width:88pt;border-top:0.5pt solid windowtext;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" style="height:15pt;border-top:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;border-left:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"># From Shanks
& Pottenger.</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" style="height:15pt;border-top:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;border-left:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"># Zone</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">NAME</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">STDOFF</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">RULES</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">FORMAT</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">[UNTIL]</td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" style="height:15pt;border-top:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;border-left:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">Zone</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">Asia/Dushanbe</td>
<td class="gmail-xl64" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">04:35:12</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">-</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">LMT</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">1924 May 2</td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" style="height:15pt;border-top:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;border-left:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl65" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">5:00</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">-</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">+05</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">1930 Jun 21</td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" style="height:15pt;border-top:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;border-left:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">6:00</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">RussiaAsia</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">+06/+07</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">1991 Mar 31 2:00s</td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" style="height:15pt;border-top:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;border-left:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">5:00</td>
<td class="gmail-xl66" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;background:yellow;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">1:00</td>
<td class="gmail-xl66" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;background:yellow;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">+05/+06</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">1991 Sep 9
2:00s</td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl63" style="height:15pt;border-top:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;border-left:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
<td class="gmail-xl65" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">05:00</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">-</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">+05</td>
<td class="gmail-xl63" style="border-top:none;border-left:none;border-right:0.5pt solid windowtext;border-bottom:0.5pt solid windowtext;padding-top:1px;padding-right:1px;padding-left:1px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap"> </td>
</tr>
</tbody></table><br></div><div>My guess is that '+05/+06' should be '+05'.</div><div>I may well be wrong. Could you let me know either way?</div><div><br></div><div>If you are interested, I have found a few other bits and pieces where the data files are in slight variance with the documentation but are not show-stoppers.</div><div>Most of these occur in the very early releases. (I am testing every database available on <a href="https://data.iana.org/time-zones/releases/">https://data.iana.org/time-zones/releases/</a>)</div><div><br></div><div>Regards</div><div><br></div><div>Nick Deguillaume</div><div>+44 75 2828 6473<br></div></div>