Develop Reference

how to know the result of substraction of date

I have a date like this 2017-07-25 09:30:49, when I subtract 2017-07-25 10:30:00 and 2017-07-25 09:30:00, I need a result like 1 Hours.
I can't find correct search key for googling what I need.
Anyone know what should I search on google ? or someone knows some function about that?
PS. Mysql or Javascript

Try with date object in javascript
Like this
var d1 = new Date("2017-07-25 10:30:00");
var d2 = new Date("2017-07-25 09:30:49")
var diff = Math.abs(d1-d2); // difference in milliseconds
Then convert the milliseconds to hours
var hours = parseInt((diff/(1000*60*60))%24);

You can go through it
Get the time difference between two datetimes
But the query is not clear do you want only the hour difference or you want the difference converted to hour format
Like what it will give if 2017-07-25 09:30:49 and 2017-07-26 10:30:00 ? 25 hour or 1 hour?

here a code example of how to do it
var date1 = new Date("2017-07-25 09:30:49");
var date2 = new Date("2017-07-25 10:30:00");
var datesum = new Date(date1 - date2);
var hours = datesum.getHours();
var minutes = datesum.getMinutes();
var seconds = datesum.getSeconds();
console.log(hours + " hour, " + minutes + " minutes, " + seconds + " seconds" )

var dateString = "2017-07-25 09:30:49";
var dateString2= "2017-07-25 11:30:00";
var reggie = /(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})/;
var dateArray = reggie.exec(dateString);
var dateArray2= reggie.exec(dateString2);
var dateObject1= new Date(
(+dateArray[1]),
(+dateArray[2])-1, // Careful, month starts at 0!
(+dateArray[3]),
(+dateArray[4]),
(+dateArray[5]),
(+dateArray[6])
);
var dateObject2= new Date(
(+dateArray2[1]),
(+dateArray2[2])-1, // Careful, month starts at 0!
(+dateArray2[3]),
(+dateArray2[4]),
(+dateArray2[5]),
(+dateArray2[6])
);
var diff = Math.abs(dateObject2-dateObject1); // difference in milliseconds
var hours = parseInt((diff/(1000*60*60))%24);

Try with the below dateFormatter function :
var d1 = new Date("2017-07-25 10:30:00");
var d2 = new Date("2017-07-25 09:30:00")
var diff = Math.abs(d1-d2);
var d = dateFormatter(diff);
console.log(d);
function dateFormatter(t){
var cd = 24 * 60 * 60 * 1000;
var ch = 60 * 60 * 1000;
var cm = 60*1000;
var d = Math.floor(t / cd);
var h = '0' + Math.floor( (t - d * cd) / ch);
var m = '0' + Math.round( (t - d * cd - h * ch) / 60000);
var s = '0' + Math.round((t - (d * cd) - (h * ch) - (m * cm))/1000);
return d + " days, " + h.substr(-2) + " hours, " + m.substr(-2) + " minutes, " +s.substr(-2)+ " seconds";
}

get current datetime in minutes and convert datetime (d.m.Y H:m) to minutes Javascript

Please i need some help in javascript or jQuery :
how to get current date and time to minutes?
i have a datetime in that format : 'd/m/Y H:m' (example 25/12/2016 22:35) in input . how to get it and convert it to minutes ? and make difference between it and current datetime
Thank you in advance for help. I tried all but nothing works

To get the current date and time to minutes, you could divide the milliseconds:
var theMinutes = new Date().getTime() / (1000 * 60);
To get the input and convert it to minutes, you could use a Date object, and divide the milliseconds:
var someDateTime = document.getElementById("someDateTime").value;
var someParts = someDateTime.split(" ");
var theDate = someParts[0];
var theTime = someParts[1];
var dateParts = theDate.split("/");
var timeParts = theTime.split(":");
var theDay = dateParts[0];
var theMonth = dateParts[1];
var theYear = dateParts[2];
var theHours = timeParts[0];
var theMinutes = timeParts[1];
var someDateTimeObject = new Date(theYear, theMonth, theDay, theHours, theMinutes, 0 );
var someDateTimeObjectMillis = someDateTimeObject.getTime();
var someDateTimeObjectMinutes = someDateTimeObjectMillis / (1000 * 60);

Hello thank you for all yours answers
Firsly i get the current time using php ( in Milliseconds) then convert pickup date to milliseconds and get differences between them in hours :
promo (in minutes) i get 767 hours normally i should get : 47 hours and some minutes
var startdate=document.getElementById('pickupdate').value; //03-11-2015 15:49
var someParts = startdate.split(" ");
var theDate = someParts[0];
var theTime = someParts[1];
var dateParts = theDate.split("-");
var timeParts = theTime.split(":");
var theDay = dateParts[0];
var theMonth = dateParts[1];
var theYear = dateParts[2];
var theHours = timeParts[0];
var theMinutes = timeParts[1];
var someDateTimeObject = new Date(theYear, theMonth, theDay, theHours, theMinutes, 0 );
var someDateTimeObjectMillis = someDateTimeObject.getTime();
//var someDateTimeObjectMinutes = someDateTimeObjectMillis / (1000 * 60);
alert(someDateTimeObjectMillis);
var maintenant = <?php echo(round(microtime(true) * 1000)); ?>;
alert(maintenant);
var diff = someDateTimeObjectMillis - maintenant;
alert(diff);
var promo = diff/(60 * 1000);
alert(promo); // 46079
thank you for your support

JavaScript date difference correction

I have a function that will calculate time between two date / time but I am having a small issue with the return.
Here is the way I collect the information.
Start Date
Start Time
Ending Date
Ending Time
Hours
And here is the function that calculates the dates and times:
function calculate (form) {
var d1 = document.getElementById("date1").value;
var d2 = document.getElementById("date2").value;
var t1 = document.getElementById("time1").value;
var t2 = document.getElementById("time2").value;
var dd1 = d1 + " " + t1;
var dd2 = d2 + " " + t2;
var date1 = new Date(dd1);
var date2 = new Date(dd2);
var sec = date2.getTime() - date1.getTime();
if (isNaN(sec)) {
alert("Input data is incorrect!");
return;
}
if (sec < 0) {
alert("The second date ocurred earlier than the first one!");
return;
}
var second = 1000,
minute = 60 * second,
hour = 60 * minute,
day = 24 * hour;
var hours = Math.floor(sec / hour);
sec -= hours * hour;
var minutes = Math.floor(sec / minute);
sec -= minutes * minute;
var seconds = Math.floor(sec / second);
var min = Math.floor((minutes * 100) / 60);
document.getElementById("result").value = hours + '.' + min;
}
If I put in todays date for both date fields and then 14:30 in the first time field and 15:35 in the second time field the result is shown as 1.8 and it should be 1.08
I didn't write this function but I am wondering if someone could tell me how to make that change?
Thank you.

If I understand correctly, the only issue you are having is that the minutes are not padded by zeroes. If this is the case, you can pad the value of min with zeroes using this little trick:
("00" + min).slice(-2)

I can't see why 15:35 - 14:30 = 1.08 is useful?
Try this instead:
function timediff( date1, date2 ) {
//Get 1 day in milliseconds
var one_day=1000*60*60*24;
// Convert both dates to milliseconds
var date1_ms = date1.getTime();
var date2_ms = date2.getTime();
// Calculate the difference in milliseconds
var difference_ms = date2_ms - date1_ms;
//take out milliseconds
difference_ms = difference_ms/1000;
var seconds = Math.floor(difference_ms % 60);
difference_ms = difference_ms/60;
var minutes = Math.floor(difference_ms % 60);
difference_ms = difference_ms/60;
var hours = Math.floor(difference_ms % 24);
var days = Math.floor(difference_ms/24);
return [days,hours,minutes,seconds];
}
function calculate (form) {
var d1 = document.getElementById("date1").value;
var d2 = document.getElementById("date2").value;
var t1 = document.getElementById("time1").value;
var t2 = document.getElementById("time2").value;
var dd1 = d1 + " " + t1;
var dd2 = d2 + " " + t2;
var date1 = new Date(dd1);
var date2 = new Date(dd2);
var diff = timediff(date1, date2);
document.getElementById("result").value = diff[1] + ':' + diff[2];
}

Verify if number of minutes is less than 10 and if it is then append an additional zero in front. Follow similar approach for seconds.

Is there a better way to calculate age of content

I have written a code to calculate the age of content on a website. It's inefficient, and the calculations are way off. I've written this script before, and last time it worked perfectly, but I can't find the damn file it's in.
I think the calculation problem is caused by the year. Can anyone suggest a fix up for me? Created date format is YYYYMMDD and output is in whole weeks (this is important), i.e. the example below should output '52' weeks.
var created='20120223';
var year=Number(created.substr(0,4));
var month=Number(created.substr(4,2))-1;
var day=Number(created.substr(6,2));
var d = new Date();
var curr_date = d.getDate();
var curr_month = d.getMonth() + 1;
var curr_year = d.getFullYear();
var input_age = ((((curr_year - year)*31536000) + ((curr_month - month)*2678400) + ((curr_date - day)*86400))/604800).toFixed(0);
document.getElementById('item12345_input').value = input_age + ' weeks';

you are subtracting a month first. then you are again adding a month. try this
var created='20120223';
var year=Number(created.substr(0,4));
var month=Number(created.substr(4,2))-1;
var day=Number(created.substr(6,2));
var d = new Date();
var curr_date = d.getDate();
var curr_month = d.getMonth();
var curr_year = d.getFullYear();
var input_age = ((((curr_year - year)*31536000) + ((curr_month - month)*2678400) + ((curr_date - day)*86400))/604800).toFixed(0);
alert(input_age + ' weeks');

Note Months are 0 based
<script>
var created ="20120223";
var yyyy = +created.substring(0, 4);
var mm = created.substring(4, 6)-1;
var dd = +created.substring(6, 8);
var createdDate = new Date(yyyy,mm,dd);
var ageMillis = new Date().getTime() - createdDate.getTime();
var MS_PER_WEEK = 1000/* ms /sec */
* 60 /* sec/min */
* 60 /* min/hr */
* 24 /* hr /day */
* 7 /* day/wk */;
var ageWeeks = parseInt(ageMillis / MS_PER_WEEK);
alert("Created on " +mm+"/"+dd+"/"+yyyy+" which is "+ageWeeks+ " week"+(ageWeeks==1?"":"s")+" ago");
</script>

you could try this:
var created='20120223';
var year=Number(created.substr(0,4));
var month = Number(created.substr(4,2));
if (Number(created.substr(4,2)) < 10){
month = '0'+ Number(created.substr(4,2));
}
var day=Number(created.substr(6,2));
var dt = year+'-'+month+'-'+day;
var dif = new Date().getTime() - Date.parse(dt);
var divWeek = 7 * 24 * 60 * 60 * 1000;
alert(Math.round(dif/divWeek));

Just subtract the 2 dates.
var createdDate = new Date(
+created.substring(0, 4), // Four digit year
created.substring(4, 6)-1, // Base-zero month
+created.substring(6, 8)); // Day of month
var ageMillis = (new Date) - createdDate;
var MS_PER_WEEK = 1000/* ms /sec */
* 60 /* sec/min */
* 60 /* min/hr */
* 24 /* hr /day */
* 7 /* day/wk */;
var ageWeeks = ageMillis / MS_PER_WEEK;

Jquery - Get the time in HH:MM format between two dates

I am getting the values from two text fields as date
var start_actual_time = $("#startPoint_complete_date").val();
var end_actual_time = $("#endPoint_complete_date").val();
which gives value
start_actual_time = 01/17/2012 11:20
end_actual_time = 01/18/2012 12:20
now i want to find out the duration in HH:MM format between these two dates (which is 25:00 in this case)
how can i do it...

var start_actual_time = "01/17/2012 11:20";
var end_actual_time = "01/18/2012 12:25";
start_actual_time = new Date(start_actual_time);
end_actual_time = new Date(end_actual_time);
var diff = end_actual_time - start_actual_time;
var diffSeconds = diff/1000;
var HH = Math.floor(diffSeconds/3600);
var MM = Math.floor(diffSeconds%3600)/60;
var formatted = ((HH < 10)?("0" + HH):HH) + ":" + ((MM < 10)?("0" + MM):MM)
alert(formatted);
See demo : http://jsfiddle.net/diode/nuv7t/5/ ( change mootools in jsfiddle
or open http://jsfiddle.net/nuv7t/564/ )

Working example:
gives alert message as 6:30
$(function(){
var startdate=new Date("01/17/2012 11:20");
var enddate=new Date("01/18/2012 12:20");
var diff = new Date(enddate - startdate);
alert(diff.getHours()+":"+diff.getMinutes());
});

First, I recommend this: http://www.mattkruse.com/javascript/date/ to convert the string to a date object, but you can convert it any way you want. Once converted, you can do this:
var difference_datetime = end_datetime.getTime() - start_datetime.getTime()
The getTime() function gets the number of milliseconds since 1970/01/01. Now you have the number of milliseconds of difference, and you can do whatever you want to convert to higher numbers (eg. divide by 1000 for seconds, divide that by 60 for minutes, divide that by 60 for hours, etc.)

I did something simular on a blog to see how long im together with my gf :P
http://daystogether.blogspot.com/ and this is how I did it:
// *****Set the unit values in milliseconds.*****
var msecPerMinute = 1000 * 60;
var msecPerHour = msecPerMinute * 60;
var msecPerDay = msecPerHour * 24;
// *****Setting dates*****
var today = new Date();
var startDate = new Date('10/27/2011 11:00:00');
// *****Calculate time elapsed, in MS*****
var interval = today.getTime() - startDate.getTime();
var days = Math.floor(interval / msecPerDay );
interval = interval - (days * msecPerDay );
var weeks = 0;
while(days >= 7)
{
days = days - 7;
weeks = weeks + 1;
}
var months = 0;
while(weeks >= 4)
{
weeks = weeks - 4;
months = months + 1;
}
// Calculate the hours, minutes, and seconds.
var hours = Math.floor(interval / msecPerHour );
interval = interval - (hours * msecPerHour );
var minutes = Math.floor(interval / msecPerMinute );
interval = interval - (minutes * msecPerMinute );
var seconds = Math.floor(interval / 1000 );
BTW this is just javascript, no jquery ;)

here you go:
function get_time_difference(start,end)
{
start = new Date(start);
end = new Date(end);
var diff = end.getTime() - start.getTime();
var time_difference = new Object();
time_difference.hours = Math.floor(diff/1000/60/60);
diff -= time_difference.hours*1000*60*60;
if(time_difference.hours < 10) time_difference.hours = "0" + time_difference.hours;
time_difference.minutes = Math.floor(diff/1000/60);
diff -= time_difference.minutes*1000*60;
if(time_difference.minutes < 10) time_difference.minutes = "0" + time_difference.minutes;
return time_difference;
}
var time_difference = get_time_difference("01/17/2012 11:20", "01/18/2012 12:20");
alert(time_difference.hours + ":" + time_difference.minutes);

start_date.setTime(Date.parse(start_actual_time));
end_date.setTime(Date.parse(end_actual_time));
//for check
start_date.toUTCString()
end_date.toUTCString()
/**
* Different in seconds
* #var diff int
*/
var diff = (end_date.getTime()-start_date.getTime())/1000;