The JavaScript Source: Math Related: Date Difference

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Date Difference

Enter two dates (including the time!) and this script will display the number of weeks, days, hours, minutes, and seconds between the two. The seconds field is optional, too. For an example, try entering your birthdate and compare it to today's date.

The JavaScript Source: Math Related: Date Difference
Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s). The script is yours!!!

  <HEAD> <SCRIPT LANGUAGE="JavaScript">      // Checks for the following valid date formats: // MM/DD/YY MM/DD/YYYY MM-DD-YY MM-DD-YYYY var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/; // requires 4 digit year var matchArray = dateStr.match(datePat); // is the format ok? if (matchArray == null) { alert(dateStr + " Date is not in a valid format.") return false; } month = matchArray[1]; // parse date into variables day = matchArray[3]; year = matchArray[4]; if (month < 1 || month > 12) { // check month range alert("Month must be between 1 and 12."); return false; } if (day < 1 || day > 31) { alert("Day must be between 1 and 31."); return false; } if ((month==4 || month==6 || month==9 || month==11) && day==31) { alert("Month "+month+" doesn't have 31 days!") return false; } if (month == 2) { // check for february 29th var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); if (day>29 || (day==29 && !isleap)) { alert("February " + year + " doesn't have " + day + " days!"); return false; } } return true; } function isValidTime(timeStr) { // Time validation function courtesty of // Sandeep V. Tamhankar (stamhankar@hotmail.com) --> // Checks if time is in HH:MM:SS AM/PM format. // The seconds and AM/PM are optional. var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/; var matchArray = timeStr.match(timePat); if (matchArray == null) { alert("Time is not in a valid format."); return false; } hour = matchArray[1]; minute = matchArray[2]; second = matchArray[4]; ampm = matchArray[6]; if (second=="") { second = null; } if (ampm=="") { ampm = null } if (hour < 0 || hour > 23) { alert("Hour must be between 1 and 12. (or 0 and 23 for military time)"); return false; } if (hour <= 12 && ampm == null) { if (confirm("Please indicate which time format you are using. OK = Standard Time, CANCEL = Military Time")) { alert("You must specify AM or PM."); return false; } } if (hour > 12 && ampm != null) { alert("You can't specify AM or PM for military time."); return false; } if (minute < 0 || minute > 59) { alert ("Minute must be between 0 and 59."); return false; } if (second != null && (second < 0 || second > 59)) { alert ("Second must be between 0 and 59."); return false; } return true; } function dateDiff(dateform) { date1 = new Date(); date2 = new Date(); diff = new Date(); if (isValidDate(dateform.firstdate.value) && isValidTime(dateform.firsttime.value)) { // Validates first date date1temp = new Date(dateform.firstdate.value + " " + dateform.firsttime.value); date1.setTime(date1temp.getTime()); } else return false; // otherwise exits if (isValidDate(dateform.seconddate.value) && isValidTime(dateform.secondtime.value)) { // Validates second date date2temp = new Date(dateform.seconddate.value + " " + dateform.secondtime.value); date2.setTime(date2temp.getTime()); } else return false; // otherwise exits // sets difference date to difference of first date and second date diff.setTime(Math.abs(date1.getTime() - date2.getTime())); timediff = diff.getTime(); weeks = Math.floor(timediff / (1000 * 60 * 60 * 24 * 7)); timediff -= weeks * (1000 * 60 * 60 * 24 * 7); days = Math.floor(timediff / (1000 * 60 * 60 * 24)); timediff -= days * (1000 * 60 * 60 * 24); hours = Math.floor(timediff / (1000 * 60 * 60)); timediff -= hours * (1000 * 60 * 60); mins = Math.floor(timediff / (1000 * 60)); timediff -= mins * (1000 * 60); secs = Math.floor(timediff / 1000); timediff -= secs * 1000; dateform.difference.value = weeks + " weeks, " + days + " days, " + hours + " hours, " + mins + " minutes, and " + secs + " seconds"; return false; // form should never submit, returns false } // End --> </script> </HEAD>  <BODY> <center> <form onSubmit="return dateDiff(this);"> <table> <tr><td> <pre> First Date: Date: <input type=text name=firstdate value="" size=10 maxlength=10> (MM/DD/YYYY format) Time: <input type=text name=firsttime value="" size=10 maxlength=10> (HH:MM:SS format) Second Date: Date: <input type=text name=seconddate value="" size=10 maxlength=10> (MM/DD/YYYY format) Time: <input type=text name=secondtime value="" size=10 maxlength=10> (HH:MM:SS format) <center><input type=submit value="Calculate Difference!"> Date Difference:<br> <input type=text name=difference value="" size=60> </center> </pre> </td></tr> </table> </form> </center> <p><center> <font face="arial, helvetica" size="-2">Free JavaScripts provided<br> by <a href="http://javascriptsource.com">The JavaScript Source</a></font> </center><p> 
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1. From: Ejaz AhmedData diff11/26/2008 04:27:20

1. From: Ejaz Ahmed
Data diff
11/26/2008 04:27:20