I want the "input date" that is in a text format to be in a date format

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i build acalculater that calculates the week and day of a pregnat women.
the input is in a text format
and i want it to be in a date format. but when i change it, it doesn't calculate

What I have tried:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
 
 
<title>Untitled Document 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<meta http-equiv="Content-Style-Type" content="text/css"> 
<meta http-equiv="Content-Script-Type" content="text/javascript"> 
 
function calculate(f){ 
var entry = f.newD.value.split('/');//splits input value; 
if((entry.length&lt;3)||(entry[0].length!=2)||(entry[1].length!=2)||(entry[2].length!=4)||(Number(entry[0]>31))||(Number(entry[1]>12))){//some limitative conditions 
alert('Plese input data in format dd/mm/yyyy !'); 
f.difD.value = ''; 
return false; 
} 
y=entry[2]*1; 
m=entry[1]*1-1;//sets months to default values i.e Jan = 0; Feb = 1; etc. 
d=entry[0]*1; 
var newDate = new Date(y,m,d);//sets the new date 
var today = new Date();//sets the today date 
dif = ((today-newDate)/7)-1;//difference in milliseconds 
dif = Math.floor(dif/1000/60/60/24);//difference in days
yamim1 =((((today-newDate)/ 7) / (24 * 3600 * 1000))-dif)*7;
yamim1 = Math.floor(yamim1);
if(dif&lt;0){//if the date is in the past alert('The chosen date is in the past. Please input a valid date!'); 
f.difD.value = ''; 
return false; 
} 
f.difD.value = ' שבוע '+ dif + '  +  '+ yamim1 + ' ימים ' ;//assign the difference 
} 
 
 
 
 
   
    
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Posted 23-Feb-17 6:43am

Member 13019942

Updated 23-Feb-17 21:01pm

v3

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Graeme_Grant · Answer 1 · 2017-02-23T14:56:00

Solution 1

Google is your friend...

1. if you want to convert to a date: javascript format text as date - Google[^]

2. If you need to mask the input: javascript date masked input - Google[^]

Posted 23-Feb-17 14:56pm

Graeme_Grant

Peter Leow · Answer 2 · 2017-02-23T21:01:00

Solution 2

Never do that. You cannot reliably work on Date as string. Instead, use JavaScript Dates[^]. Refer to my previous answer[^].
Instead of letting user to enter free form date string, use a date picker[^] instead.

Posted 23-Feb-17 21:01pm

Peter Leow