https://www.cahighschoolfootballhof.com/assets/js/countdownup.js

1/*
2Author: Robert Hashemian
3http://www.hashemian.com/
4
5You can use this code in any manner so long as the author's
6name, Web address and this disclaimer is kept intact.
7********************************************************
8Usage Sample:
9
10<script language="JavaScript">
11TargetDate = "12/31/2020 5:00 AM";
12BackColor = "palegreen";
13ForeColor = "navy";
14CountActive = true;
15CountStepper = -1;
16LeadingZero = true;
17DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
18FinishMessage = "It is finally here!";
19</script>
20<script language="JavaScript" src="https://scripts.hashemian.com/js/countdown.js"></script>
21*/
22
23function calcage(secs, num1, num2) {
24  s = ((Math.floor(secs/num1))%num2).toString();
25  if (LeadingZero && s.length < 2)
26    s = "0" + s;
27  return s;
28}
29
30function CountBack(secs) {
31  if (secs < 0) {
32    document.getElementById("cntdwn").innerHTML = FinishMessage;
33    return;
34  }
35  DisplayStr = DisplayFormat.replace(/%%D%%/g, calcage(secs,86400,100000));
36  DisplayStr = DisplayStr.replace(/%%H%%/g, calcage(secs,3600,24));
37  DisplayStr = DisplayStr.replace(/%%M%%/g, calcage(secs,60,60));
38  DisplayStr = DisplayStr.replace(/%%S%%/g, calcage(secs,1,60));
39
40  document.getElementById("cntdwn").innerHTML = DisplayStr;
41  if (CountActive)
42    setTimeout("CountBack(" + (secs+CountStepper) + ")", SetTimeOutPeriod);
43}
44
45function putspan(backcolor, forecolor) {
46 document.write("<span id='cntdwn' style='background-color:" + backcolor +
47                "; color:" + forecolor + "'></span>");
48}
49
50if (typeof(BackColor)=="undefined")
51  BackColor = "white";
52if (typeof(ForeColor)=="undefined")
53  ForeColor= "black";
54if (typeof(TargetDate)=="undefined")
55  TargetDate = "12/31/2020 5:00 AM";
56if (typeof(DisplayFormat)=="undefined")
57  DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
58if (typeof(CountActive)=="undefined")
59  CountActive = true;
60if (typeof(FinishMessage)=="undefined")
61  FinishMessage = "";
62if (typeof(CountStepper)!="number")
63  CountStepper = -1;
64if (typeof(LeadingZero)=="undefined")
65  LeadingZero = true;
66
67
68CountStepper = Math.ceil(CountStepper);
69if (CountStepper == 0)
70  CountActive = false;
71var SetTimeOutPeriod = (Math.abs(CountStepper)-1)*1000 + 990;
72putspan(BackColor, ForeColor);
73var dthen = new Date(TargetDate);
74var dnow = new Date();
75if(CountStepper>0)
76  ddiff = new Date(dnow-dthen);
77else
78  ddiff = new Date(dthen-dnow);
79gsecs = Math.floor(ddiff.valueOf()/1000);
80CountBack(gsecs);