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A Date question provides the respondent with a field specially designed to hold a date. This could be used for example to ask for the respondent's date of birth, the date of a particular event etc.
The question details page includes a number of fields and options. All the properties available for this question type are described in the Question Properties section (go to Accessing Question Properties for more information).
Figure 1 - The Date item's question details page
When the respondent clicks on the date field button, a calendar opens enabling him/her to select the desired date. This ensures the format of the date input is correct.
Note: The displayed date format may differ from the actual value. The displayed date is formatted based on the locale of the user's browser. However the parsed value is always formatted yyyy-mm-dd.
Note: When a date item is used in a survey, it will be available (as all other items) in the survey data. When editing the respondent data you will be able to select the date as a column and search for respondents based on the date.
When designing this question, you can choose to add "Don't know" and "Prefer not to answer" options.
These options will appear beneath the question when users take the survey; selecting either option allows the user to continue without entering an answer in the field.
Learn more here: Don't Know and Prefer Not to Answer Choices.