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wizard04 on 09/02/11

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# Get time intervals between two Dates

/ Published in: JavaScript

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1. /* Get time intervals between two Dates v2.0
2.  *
5.  *
6.  * Author: Andy Harrison, http://dragonzreef.com/
7.  * Date: 16 September 2011
8.  */
9.
10. Date.isLeapYear = function(year){ return (year%400 == 0 || (year%4 == 0 && year%100 != 0)); }
11. Date.prototype.isLeapYear = function(){ return Date.isLeapYear(this.getFullYear()); }
12.
13. //get the number of days in a given month of a given year (month being 0-11)
14. Date.daysInMonth = function(year, month){ return ([31, (Date.isLeapYear(year)?29:28), 31,30,31,30,31,31,30,31,30,31])[month]; }
15. Date.prototype.daysInMonth = function(){ return Date.daysInMonth(this.getFullYear(), this.getMonth()); }
16.
17. //returns an object with time intervals between two Dates
18. //Date objects, milliseconds, or date strings are accepted arguments
19. //object properties: years, months, weeks, days, hours, minutes, seconds, milliseconds
20. //each part is *in addition* to the sum of the larger parts; e.g., if there are 17 days between the two dates, .weeks==2 and .days==3
21. Date.timeBetween = function(dateA, dateB)
22. {
23. dateA = new Date(dateA);
24. dateB = new Date(dateB);
25. if(isNaN(dateA.valueOf()+dateB.valueOf())) return null; //invalid date(s)
26.
27. if(dateA.valueOf() > dateB.valueOf())
28. {
29. var tmp = dateA;
30. dateA = dateB;
31. dateB = tmp;
32. }
33.
34. var parts = {};
35.
36. //years
37. parts.years = dateB.getFullYear() - dateA.getFullYear();
38.
39. //months
40. dateA.setFullYear(dateB.getFullYear());
41. parts.months = dateB.getMonth() - dateA.getMonth();
42.
43. //days
44. dateA.setMonth(dateB.getMonth());
45. if(dateA.valueOf() > dateB.valueOf())
46. {
47. dateA.setMonth(dateA.getMonth()-1);
48. parts.months--;
49. }
50. parts.days = Math.floor((dateB.valueOf()-dateA.valueOf())/86400000);
51.
52. //time
53. parts.hours = dateB.getHours() - dateA.getHours();
54. parts.minutes = dateB.getMinutes() - dateA.getMinutes();
55. parts.seconds = dateB.getSeconds() - dateA.getSeconds();
56. parts.milliseconds = dateB.getMilliseconds() - dateA.getMilliseconds();
57.
58. //weeks
59. parts.weeks = Math.floor(parts.days/7);
60. parts.days = parts.days%7;
61.
63. if(parts.milliseconds < 0){ parts.milliseconds = 1000+parts.milliseconds; parts.seconds--; }
64. if(parts.seconds < 0){ parts.seconds = 60+parts.seconds; parts.minutes--; }
65. if(parts.minutes < 0){ parts.minutes = 60+parts.minutes; parts.hours--; }
66. if(parts.hours < 0) parts.hours = 24+parts.hours;
67. if(parts.months < 0){ parts.months = 12+parts.months; parts.years--; }
68.
69. return parts;
70. }