JodaTime equivalent of DateUtils.truncate()

Question

I have never used JodaTime before, but answering this question, How to get ordinal Weekdays in a Month.

I tried it and came up with this ugly code to unset all fields below day:

DateTime startOfMonth =     input.withDayOfMonth(1)         .withHourOfDay(0)       // there         .withMinuteOfHour(0)    // has got to         .withSecondOfMinute(0)  // be a shorter way         .withMillisOfSecond(0); // to do this 

Where the Commons / Lang equivalent using DateUtils would be

Date startOfMonth = DateUtils.truncate(input, Calendar.MONTH); 

What's the preferred idiom to do that in JodaTime?

Answer 1

You can use roundFloorCopy() to mimic DateUtils.truncate

Date truncateMonth = DateUtils.truncate(input, Calendar.MONTH); -> DateTime truncateMonth = input.dayOfMonth().roundFloorCopy();  Date truncateMinute = DateUtils.truncate(input, Calendar.MINUTE); -> DateTime truncateMinute = input.minuteOfDay().roundFloorCopy();  Date truncateHourOfDay = DateUtils.truncate(input, Calendar.HOUR_OF_DAY); -> DateTime truncateHourOfDay = input.hourOfDay().roundFloorCopy() 

Answer 2

Use the withMillisOfDay() method to shorten the syntax.

 DateTime startOfMonth = input.withDayOfMonth(1).withMillisOfDay(0);