Q:

How to convert Date String to joda DateTime?

I have a date string "Wed Nov 20 00:00:00 IST 2019". How do I convert it to joda DateTime with the pattern "yyyyMMdd".

dateObject.setStartDate(new DateTime().plusDays(1).toString("yyyyMMdd"));

A:

The problem with your String pattern is, that JodaTime does not recognize the 'IST' timezone. (See http://joda-time.sourceforge.net/timezones.html for a list of supported time zones.)
If you always want to parse the date in the same time zone, you could use:
DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("EEE MMM dd HH:mm:ss 'IST' yyyy").withZone(DateTimeZone.forID("Indian/Mahe"));
DateTime parsed = DateTime.parse("Wed Nov 20 00:00:00 IST 2019", dateTimeFormatter);

Note that I have used IST as a string literal in the pattern format, i.e., this will only work if your date strings always includes the "IST" string.
To add fixed time zone information to your parsed date use withZone on the formatter. I picked a random Indian timezone known to JodaTime, "Indian/Mahe" in this case. Look up the one that matches your time zone in the list of supported time zones.

