Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Using Perl and hand-crafted regexes instead of facilities like strptime: </p> <pre><code>#!/bin/perl -w while (&lt;&gt;) { # for date times that don't use leading zeroes, use this regex instead: # (?:\d{1,2}/\d{1,2}/\d{4} )(\d{1,2})(?::\d\d:\d\d) (AM|PM) while (m%(?:\d\d/\d\d/\d{4} )(\d\d)(?::\d\d:\d\d) (AM|PM)%) { my $hh = $1; $hh -= 12 if ($2 eq 'AM' &amp;&amp; $hh == 12); $hh += 12 if ($2 eq 'PM' &amp;&amp; $hh != 12); $hh = sprintf "%02d", $hh; # for date times that don't use leading zeroes, use this regex instead: # (\d{1,2}/\d{1,2}/\d{4} )(\d{1,2})(:\d\d:\d\d) (?:AM|PM) s%(\d\d/\d\d/\d{4} )(\d\d)(:\d\d:\d\d) (?:AM|PM)%$1$hh$3%; } print; } </code></pre> <p>That's very fussy - but also converts possibly multiple timestamps per line.</p> <p>Note that the transformation for AM/PM to 24-hour is not trivial.</p> <ul> <li>12:01 AM --> 00:01</li> <li>12:01 PM --> 12:01</li> <li>01:30 AM --> 01:30</li> <li>01:30 PM --> 13:30</li> </ul> <p>Now tested:</p> <pre><code>perl ampm-24hr.pl &lt;&lt;! 12/24/2005 12:01:00 AM 09/22/1999 12:00:00 PM 12/12/2005 01:15:00 PM 01/01/2009 01:56:45 AM 12/30/2009 10:00:00 PM 12/30/2009 10:00:00 AM ! 12/24/2005 00:01:00 09/22/1999 12:00:00 12/12/2005 13:15:00 01/01/2009 01:56:45 12/30/2009 22:00:00 12/30/2009 10:00:00 </code></pre> <hr> <p><em>Added</em>:</p> <p>In <a href="https://stackoverflow.com/questions/508752/whats-a-simple-way-to-convert-between-an-am-pm-time-to-24-hour-time-in-javascrip">What is a Simple Way to Convert Between an AM/PM Time and 24 hour Time in JavaScript</a>, an alternative algorithm is provided for the conversion:</p> <pre><code>$hh = ($1 % 12) + (($2 eq 'AM') ? 0 : 12); </code></pre> <p>Just one test...probably neater.</p>
    singulars
    1. This table or related slice is empty.
    1. POConvert 12-hour date/time to 24-hour date/time
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USJonathan Leffler
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POConvert 12-hour date/time to 24-hour date/time
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO$hh = ($hh + 12) % 24; seems pretty trivial to me...
      singulars
      1. PO
      1. USDave Sherohman
    2. CO@Dave Sherohman: Are you sure? It would have to be conditional on AM/PM being present, at minimum - you don't need to add 12 hours to an AM time such as 10:00 AM. It also doesn't seem to handle the problem that 12:59 AM is two minutes before 01:01 AM.
      singulars
      1. PO
      1. USJonathan Leffler
    3. COThanks Jonathan, worked like a charm :) I had to change the regex to `(?:\d{1,2}/\d{1,2}/\d{4} )(\d{1,2})(?::\d\d:\d\d) (AM|PM)`, but other than that this was spot on.
      singulars
      1. PO
      1. USPatrick Cuff
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload