Just another update

Task/Date-manipulation/00DESCRIPTION

@@ -1,3 +1,7 @@
-Given the date string "March 7 2009 7:30pm EST", output the time 12 hours later in any human-readable format.
+{{omit from|ML/I}}
+{{omit from|PARI/GP|No real capacity for string manipulation}}
+
+Given the date string "March 7 2009 7:30pm EST", <br>
+output the time 12 hours later in any human-readable format.
 
 As extra credit, display the resulting time in a time zone different from your own.

Task/Date-manipulation/00META.yaml

@@ -1,2 +1,4 @@
 ---
+category:
+- Date and time
 note: Text processing

Task/Date-manipulation/J/date-manipulation-1.j

@@ -0,0 +1,27 @@
+require'dates'
+months=: <;._2 tolower 0 :0
+January
+February
+March
+April
+May
+June
+July
+August
+September
+October
+November
+December
+)
+
+numbers=: _".' '"_`(1 I.@:-e.&(":i.10)@])`]}~
+words=: [:;:@tolower' '"_`(I.@(tolower = toupper)@])`]}~
+getyear=: >./@numbers
+getmonth=: 1 + months <./@i. words
+getday=: {.@(numbers -. getyear)
+gethour=: (2 { numbers) + 12 * (<'pm') e. words
+getminsec=: 2 {. 3}. numbers
+
+getts=: getyear, getmonth, getday, gethour, getminsec
+timeadd=: 1&tsrep@+&tsrep
+deltaT=: (1 tsrep 0)&([ + -@#@[ {. ])

Task/Date-manipulation/J/date-manipulation-2.j

@@ -0,0 +1,6 @@
+   (deltaT 12 0 0) timeadd getts 'March 7 2009 7:30pm EST'
+2009 3 8 7 30 0
+   timestamp (deltaT 12 0 0) timeadd getts 'March 7 2009 7:30pm EST'
+08 Mar 2009 07:30:00
+   isotimestamp (deltaT 12 0 0) timeadd getts 'March 7 2009 7:30pm EST'
+2009-03-08 07:30:00.000

Task/Date-manipulation/JavaScript/date-manipulation.js

@@ -1,51 +1,41 @@
 function add12hours(dateString) {
 
   // Get the parts of the date string
-  var parts = dateString.split(/\s+/);
-  var date  = parts[1];
-  var month = parts[0];
-  var year  = parts[2];
-  var time  = parts[3];
-  var ampm  = time && time.match(/[a-z]+$/i)[0];
-  var hr    = Number(time.split(':')[0]);
-  var min   = Number(time.split(':')[1].replace(/\D/g,''));
-  var zone  = parts[4].toUpperCase();
+  var parts = dateString.split(/\s+/),
+      date  = parts[1],
+      month = parts[0],
+      year  = parts[2],
+      time  = parts[3];
+
+  var hr    = Number(time.split(':')[0]),
+      min   = Number(time.split(':')[1].replace(/\D/g,'')),
+      ampm  = time && time.match(/[a-z]+$/i)[0],
+      zone  = parts[4].toUpperCase();
+
   var months = ['January','February','March','April','May','June',
-     'July','August','September','October','November','December'];
-  var zones = {'EST': 300, 'AEST': -600}; // Minutes to add to zone time to get UTC
+                'July','August','September','October','November','December'];
+  var zones  = {'EST': 300, 'AEST': -600}; // Minutes to add to zone time to get UTC
 
-  // Convert month name to number, zero indexed
-  // Could use indexOf but not supported widely
-  for (var i=0, iLen=months.length; i<iLen; i++) {
-    if (months[i] == month) {
-      month = i;
-    }
-  }
-  if (typeof month != 'number') return; // Invalid month name provided
+  // Convert month name to number, zero indexed. Return if invalid month
+  month = months.indexOf(month);
+  if (month === -1) { return; }
 
-  // Convert hours to 24hr
-  if (ampm && ampm.toLowerCase() == 'pm') {
-    hr += 12;
-  }
-
-  // Add 12 hours to hours
-  hr += 12;
+  // Add 12 hours as specified. Add another 12 if pm for 24hr time
+  hr += (ampm.toLowerCase() === 'pm') ? 24 : 12
 
   // Create a date object in local zone
-  var d = new Date(year, month, date);
-  d.setHours(hr, min, 0, 0);
+  var localTime = new Date(year, month, date);
+  localTime.setHours(hr, min, 0, 0);
 
-  // Adjust minutes for the time zones
-  d.setMinutes(d.getMinutes() + zones[zone] - d.getTimezoneOffset() );
-
-  // d is now a local date representing the same moment as the
-  // source date plus 12 hours
-  return d;
+  // Adjust localTime minutes for the time zones so it is now a local date
+  // representing the same moment as the source date plus 12 hours
+  localTime.setMinutes(localTime.getMinutes() + zones[zone] - localTime.getTimezoneOffset() );
+  return localTime;
 }
 
 var inputDateString = 'March 7 2009 7:30pm EST';
 
-alert(
+console.log(
   'Input: ' + inputDateString + '\n' +
   '+12hrs in local time: ' + add12hours(inputDateString)
  );

Task/Date-manipulation/Ruby/date-manipulation-3.rb

@@ -0,0 +1,6 @@
+require "date"
+
+puts d1 = DateTime.parse("March 7 2009 7:30pm EST")
+# d1 + 1 would add a day, so add half a day:
+puts d2 = d1 + 1/2r # 1/2r is a rational; 0.5 would also work
+puts d3 = d2.new_offset('+09:00')