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- <html>
- <body>
- <script>
- function WindowLoad(event) {
- /*
- I have a simple math question (warning I am terrible at math) I have a recorder,
- I know it can make recordings of 1 hour 2 minutes and 6 seconds per file,
- when a file ends it automatically starts the next file, if I know the start
- time and the "mark time", what would be the formula to get which file and what
- time of that file the "mark time” is at in that file? this is not homework, it
- is a problem I am trying to solve for an actual recorder I have, but I can’t seem
- to get the right value… please give me a layman’s answer, not a mathematicians answer
- something seems to be wrong cause when I enter 00:00:00 as the start time and 16:00:00 as the mark time I
- get "in file:16 time in file:00:28:30” but just looking at the minutes, 28 minutes seems off cause 2 minutes
- times 16 is 32 minutes, and it should even be 33 minutes I think because the seconds being 6 seconds times 16 would
- be 90 seconds, which is over a minute, what am I doing wrong?
- monoprotic:amigojapan: 15 files takes 15*(01:02:06) = 15:31:30
- monoprotic:amigojapan: so 15 are complete; the end point is in the 16th file, 16:00:00 - 15:31:30 = 00:28:30 into it
- amigojapan: is the program output correct then?
- monoprotic:amigojapan: it seems to be, i think you're just confused about what the output is
- */
- function time_to_seconds(hms) {
- //var hms = '02:04:33'; // your input string
- var a = hms.split(':'); // split it at the colons
- // minutes are worth 60 seconds. Hours are worth 60 minutes.
- var seconds = (+a[0]) * 60 * 60 + (+a[1]) * 60 + (+a[2]);
- //console.log(seconds);
- return seconds;
- }
- function seconds_to_time(sec_num ) {
- var hours = Math.floor(sec_num / 3600);
- var minutes = Math.floor((sec_num - (hours * 3600)) / 60);
- var seconds = sec_num - (hours * 3600) - (minutes * 60);
- if (hours < 10) {hours = "0"+hours;}
- if (minutes < 10) {minutes = "0"+minutes;}
- if (seconds < 10) {seconds = "0"+seconds;}
- return hours+':'+minutes+':'+seconds;
- }
- //calculate the time in seconds of each file start
- var files_in_seconds=[];
- var GB_SD=32;//32gigabytes 2 gygabytes per file
- for(var file_index=0;file_index<(GB_SD/2)+1;file_index++) {
- files_in_seconds.push((file_index) * time_to_seconds("01:02:06"));//'01:02:06' time of one file
- }
- var start_time=time_to_seconds(prompt("start time HH:MM:SS","15:30:00"));
- var mark_time=time_to_seconds(prompt("mark time HH:MM:SS","15:30:00"));
- var time_from_start=mark_time-start_time;
- //find which file it is in
- for(var file_index in files_in_seconds) {
- if(time_from_start >= files_in_seconds[parseInt(file_index)] && time_from_start < files_in_seconds[parseInt(file_index)+1]) {
- time_in_file=time_from_start-files_in_seconds[parseInt(file_index)];
- alert(
- "start time:"+seconds_to_time(start_time)
- +
- "\nmark time:"+seconds_to_time(mark_time)
- +
- "\ntime from start:"+seconds_to_time(time_from_start)
- +
- "\nin file:"+(parseInt(file_index)+1)
- +
- "\ntime in file:"+seconds_to_time(time_in_file)
- );
- }
- }
- }
- window.addEventListener('load', WindowLoad, false);
- </script>
- no output needed. hit relaod to calculate again (javascript must be enabled for this program to work)
- </body>
- </html>
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