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I believe that is possible, you can disable previous or prior dates from the current one by enabling the option "Disabling Past Dates". You can follow the screenshots below.
1. Click the "Properties" in your Date field.
2. Enable the option "Disable Past Dates".
3. Make sure to save the changes. Here's a demo form: http://form.jotformpro.com/form/50468644203958. Enter a date prior to the default one and you'll see a warning message.
Do let us know if this works.
OOps actually its a Localized Calendar widget....so there is no feature like you showed..can u please help me again. :P
Unfortunately, the localized calendar widget does not have an option to disable the past dates. However, you can still the DateTime tool and follow the instructions of ecem.
As we cannot answer multiple questions in one thread, I have moved your latest question to a new thread and you will be answered here: http://www.jotform.com/answers/583898