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   1 var clone = require('../lang/clone');
   2
   3     /**
   4      * get a new Date object representing start of period
   5      */
   6     function startOf(date, period){
   7         date = clone(date);
   8
   9         // intentionally removed "break" from switch since start of
  10         // month/year/etc should also reset the following periods
  11         switch (period) {
  12             case 'year':
  13                 date.setMonth(0);
  14             /* falls through */
  15             case 'month':
  16                 date.setDate(1);
  17             /* falls through */
  18             case 'week':
  19             case 'day':
  20                 date.setHours(0);
  21             /* falls through */
  22             case 'hour':
  23                 date.setMinutes(0);
  24             /* falls through */
  25             case 'minute':
  26                 date.setSeconds(0);
  27             /* falls through */
  28             case 'second':
  29                 date.setMilliseconds(0);
  30                 break;
  31             default:
  32                 throw new Error('"'+ period +'" is not a valid period');
  33         }
  34
  35         // week is the only case that should reset the weekDay and maybe even
  36         // overflow to previous month
  37         if (period === 'week') {
  38             var weekDay = date.getDay();
  39             var baseDate = date.getDate();
  40             if (weekDay) {
  41                 if (weekDay >= baseDate) {
  42                     //start of the week is on previous month
  43                     date.setDate(0);
  44                 }
  45                 date.setDate(date.getDate() - date.getDay());
  46             }
  47         }
  48
  49         return date;
  50     }
  51
  52     module.exports = startOf;
  53
  54