Date validation and formatting using Javascript

Hi Experts,

I want to validate and format date field (mm/dd/yy) using javascript and am looking for sample code snippet.
Valid year is in between 1938 to 2050.

Valid i/p         o/p (Validation & Formatting)

12345-->         01/23/45
1232009-->     01/23/09
10122014-->   10/12/14
101214--->      10/12/14
10/20/2014--> 10/20/14
10/20/14-->     10/20/14
10-20-14-->     10/20/14
10-20-2014--> 10/20/14

Invalid Dates

12/89/2014->Invalid Date format,since we can't have date 89
13/12/2014->Invalid Date format,since we can't have month 13
1234567890->Invalid date format

Thanks in Advance
ksd123Asked:
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leakim971PluritechnicianCommented:
you should(must) go this logic and use a datepicker : http://jqueryui.com/datepicker/
or at least use this : http://digitalbush.com/projects/masked-input-plugin/
HTML5 : http://www.w3.org/TR/html-markup/input.date.html
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GaryCommented:
It's crazy to allow any kind of input like that and try and work out a date from it - follow leakim's advice

What about:
11111
Is that supposed to 1/11/11 or 11/1/11
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Slick812Commented:
????
You really must use a more restricted set of "inputs" as your first example CAN NOT meet your specifications -
12345-->   01/23/45

you specify this - "year is in between 1938 to 2050"
so this -
12345  could be either 1945  OR  2045, a difference of 100 years, so your inputs can not give correct outputs

as to invalid date check, this is not usually dificult with dates in this format -
    3/19/2014

BUT that format is NOT the same as you give in the first examples as -
    10/12/14

I ask you "Where does the text date input come from? ?"
a server database SELECT, user input, a web REST service?
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