number of days calculation

[peterjerome]

is there a way to calculate the number of days between two dates? ...ie numberDays = (date1 - date2).
thanks,
peter.

Hi Peter,

Yes, here are several links that show how to code a function that will do this.

http://www.breakingpar.com/bkp/home....256CC30078F008
http://www.vijayjoshi.org/2008/10/24...in-javascript/
http://www.breakingpar.com/bkp/home....25711000753DBF
http://www.mcfedries.com/JavaScript/DaysBetween.asp

Hope this helps.

Steve

[peterjerome]

hi steve,
thank you so much. i have good success.
i used a form of your 2nd example.

function main() {
nState = getBarState();
if (nState == BARSTATE_NEWBAR) {
var oneDay = 86400000; //24*60*60*1000
var entryDate = new Date(2011,5,28); //June 28, 2011
var today = new Date();
var diffDays = Math.abs((entryDate.getTime() - today.getTime()) / (oneDay));

debugPrintln(entryDate, "**", diffDays); // diffDays = 13.47846
var numberDaysBack = Math.round(diffDays);
debugPrintln(numberDaysBack); // diffDays = 13
}
}
question. my entry date is 11 days back from todays date. the calculation shows 13 days i suspect this is due to the weekend? do you know how i could calculate the correct 11 days?
i want to use the number in high(-11) so i can calculate the highest high going back to my entry date. does this make sense?

thanks again steve,
peter.

Hi peter,

You are most welcome, good first cut on the JavaScript code. I used the links as a resource and wrote a function that takes into account the weekends and provide the number of weekdays. Read the notes in the efs, they may be helpful.

Hope this works for you.

Steve

Originally posted by peterjerome
hi steve,
thank you so much. i have good success.
i used a form of your 2nd example.

function main() {
nState = getBarState();
if (nState == BARSTATE_NEWBAR) {
var oneDay = 86400000; //24*60*60*1000
var entryDate = new Date(2011,5,28); //June 28, 2011
var today = new Date();
var diffDays = Math.abs((entryDate.getTime() - today.getTime()) / (oneDay));

debugPrintln(entryDate, "**", diffDays); // diffDays = 13.47846
var numberDaysBack = Math.round(diffDays);
debugPrintln(numberDaysBack); // diffDays = 13
}
}
question. my entry date is 11 days back from todays date. the calculation shows 13 days i suspect this is due to the weekend? do you know how i could calculate the correct 11 days?
i want to use the number in high(-11) so i can calculate the highest high going back to my entry date. does this make sense?

thanks again steve,
peter.

/*************************************************
 EFS Formula : weekdaysBetween
 Written By Steve Hare © 2011           
 written: 7/11/2011
 
 a demo efs that contains a function that will compute the number of weekdays 
 between two dates. When a date is used, the calculation assumes midnight that day 
 which is the beginning of the next day, so be aware of the basis of the calculation. I 
 included some debugPrintln output to illustrate this point.
 
 I also included some debugPrintln output to illustrate the difference in days and the difference in weeks.
 
 I used code at these links to develop this efs:
 [url]http://www.breakingpar.com/bkp/home...7256CC30078F008[/url]
 [url]http://www.vijayjoshi.org/2008/10/2...-in-javascript/[/url]
 [url]http://www.breakingpar.com/bkp/home...725711000753DBF[/url]
 [url]http://www.mcfedries.com/JavaScript/DaysBetween.asp[/url]

 posted in this thread: \"http://forum.esignalcentral.com/showthread.php?s=&threadid=36337\"
 Saved in FileShare \"http://share.esignal.com/groupgo.jsp?groupid=339\"

 *************************************************/
 
 
function weekdaysBetween(date1, date2) {
 var adjust, diffDays, e, endDate, one_day, s, startDate, weeksBetween;
 if (date1.indexOf("-") != -1) {
  date1 = date1.split("-");
 } else if (date1.indexOf("/") != -1) {
  date1 = date1.split("/");
 } else {
  return 0;
 }
 if (date2.indexOf("-") != -1) {
  date2 = date2.split("-");
 } else if (date2.indexOf("/") != -1) {
  date2 = date2.split("/");
 } else {
  return 0;
 }
 if (parseInt(date1[0], 10) >= 1000) {
  startDate = new Date(date1[0],date1[1],date1[2]);
 } else if (parseInt(date1[2], 10) >= 1000) {
  startDate = new Date(date1[2],date1[0],date1[1]);
 } else {
  return 0;
 }
 if (parseInt(date2[0], 10) >= 1000) {
  endDate = new Date(date2[0],date2[1],date2[2]);
 } else if (parseInt(date2[2], 10) >= 1000) {
  endDate = new Date(date2[2],date2[0],date2[1]);
 } else {
  return 0;
 }
 if (startDate < endDate) {
  s = startDate;
  e = endDate;
 } else {
  s = endDate;
  e = startDate;
 }
 one_day = 1000 * 60 * 60 * 24;
 diffDays = Math.floor((e - s) / one_day);
 weeksBetween = Math.floor(diffDays / 7);
 
 debugPrintln("date1 = "+date1);
 debugPrintln("date2 = "+date2);
 debugPrintln("startDate = "+s);
 debugPrintln("endDate = "+e);debugPrintln("");
 debugPrintln("diffDays = "+diffDays);
 debugPrintln("weeksBetween = "+weeksBetween);debugPrintln("");

 if (s.getDay() == e.getDay()) {
  adjust = 0;
 } else if (s.getDay() == 0 && e.getDay() == 6) {
  adjust = 5;
 } else if (s.getDay() == 6 && e.getDay() == 0) {
  adjust = 0;
 } else if (e.getDay() == 6 || e.getDay() == 0) {
  adjust = 5 - s.getDay();
 } else if (s.getDay() == 0 || s.getDay() == 6) {
  adjust = e.getDay();
 } else if (e.getDay() > s.getDay()) {
  adjust = e.getDay() - s.getDay();
 } else {
  adjust = 5 + e.getDay() - s.getDay();
 }
 return (weeksBetween * 5) + adjust;
}

var num=weekdaysBetween("06/01/2009","07/01/2009");
debugPrintln("num weekdays = "+num);

/* 
 * debug Output:
 * 
 * date1 = 06,01,2009
 * date2 = 07,01,2009
 * startDate = Wed Jul 01 2009 00:00:00 GMT-0400 (Eastern Daylight Time)
 * endDate = Sat Aug 01 2009 00:00:00 GMT-0400 (Eastern Daylight Time)
 * 
 * diffDays = 31
 * weeksBetween = 4
 * 
 * num weekdays = 22
 * 
 */