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Sencha DateTime function

/ Published in: JavaScript
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pass in a string representation for a time period and it returns a date object; Weeks are assumed to be Monday midnight Am - Sunday 23:59:59

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  1. switch (dateTimeString)
  2. {
  3. /* DAY ********************************************************/
  4.  
  5.     // get todays date-time, clear its time off
  6.     case 'firstSecondOfToday':
  7.         return Ext.Date.clearTime(new Date());
  8.  
  9.     // take firstSecondOfToday and add 86399 seconds to it- there are 86400 seconds in a day
  10.     case 'lastSecondOfToday':
  11.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfToday'), Ext.Date.SECOND, 86399); 
  12.  
  13. /* WEEK ********************************************************/  
  14.  
  15.     // take the numeric representation of the day of the week (0-6) and subtract it from todaysFirstSecond
  16.     // Add one to make the first day of the week the first second of Monday
  17.     case 'firstSecondOfTheWeek':
  18.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfToday'), Ext.Date.DAY, -Ext.Date.format(this.getDateTimeFor('firstSecondOfToday'), 'N')+1);
  19.  
  20.     // take first second of the week and subtract 7 days
  21.     case 'firstSecondOfThePreviousWeek':
  22.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheWeek'), Ext.Date.DAY, -7); 
  23.  
  24.     // take the first second of the previous week and add number of seconds in a minus one
  25.     case 'lastSecondOfThePreviousWeek':
  26.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfThePreviousWeek'), Ext.Date.SECOND, 604799); 
  27.  
  28. /* MONTH ********************************************************/        
  29.  
  30.     case 'firstSecondOfTheMonth':
  31.         return Ext.Date.getFirstDateOfMonth(new Date()); 
  32.  
  33.     // take first second of the month and subtract one month
  34.     case 'firstSecondOfThePreviousMonth':
  35.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheMonth'), Ext.Date.MONTH, -1);  
  36.  
  37.     // take the first second of the month and subtract one second
  38.     case 'lastSecondOfThePreviousMonth':
  39.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheMonth'), Ext.Date.SECOND, -1);
  40.  
  41. /* QUARTER ********************************************************/        
  42.  
  43.     // take the current month number, get the remainder after three, add one to compensate for 0 based month numbers,
  44.     // subtract from current month number
  45.     case 'firstSecondOfTheQuarter':
  46.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheMonth'), Ext.Date.MONTH, -(Ext.Date.format(this.getDateTimeFor('firstSecondOfTheMonth'), 'n')%3)+1); 
  47.  
  48.     // take the first second of the quarter and subtract 3 months
  49.     case 'firstSecondOfThePreviousQuarter':
  50.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheQuarter'), Ext.Date.MONTH, -3); 
  51.  
  52.     // take the first second of the current quarter and subtract one second
  53.     case 'lastSecondOfThePreviousQuarter':
  54.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheQuarter'), Ext.Date.SECOND, -1);
  55.  
  56. /* YEAR ********************************************************/
  57.  
  58.     // set month and date to january first and append year from firstSecondOfTheMonth
  59.     // undefined time defaults to midnight AM    
  60.     case 'firstSecondOfTheYear':
  61.         return new Date('1/1/'+Ext.Date.format(this.getDateTimeFor('firstSecondOfTheMonth'), 'Y'));
  62.  
  63.     case 'firstSecondOfThePreviousYear':
  64.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheYear'), Ext.Date.YEAR, -1); 
  65.  
  66.     // take the first second of the year and subtract one second
  67.     case 'lastSecondOfThePreviousYear':
  68.         return Ext.Date.add(this.getDateTimeFor('firstSecondOfTheYear'), Ext.Date.SECOND, -1);
  69.  
  70.     default:
  71.         console.log('Error: invalid date called from static function getDateTimeFor() - '+dateTimeString);
  72.         return -1;
  73. }

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