Calculate month difference in Joda Time

date, datediff, java, jodatime

Solution

Months.monthsBetween(
     start.withDayOfMonth(1),
     end.withDayOfMonth(1)).getMonths()

Problem

At the 4th line of code (ignore whitespace & comments) and beyond I'm calculating the month difference between 2 dates. This works, but looks a bit hacky. Is there a better way? ``` int handleAllowance(LocalDate today) { int allowance = membership.allowance(); if (allowance == 0) return 0; // if update was last month (or earlier) int months = today.monthOfYear().getMaximumValue() - today.monthOfYear().getMinimumValue(); // yeah, 12, but just to be 100% correct :-) int curMonth = (today.getYear() * months) + today. getMonthOfYear(); int updMonth = (lastAllowanceUpdate.getYear() * months) + lastAllowanceUpdate.getMonthOfYear(); if (curMonth > updMonth) { // ...and if today is on or past update day int updateDay = Math.min(allowanceDay, today.dayOfMonth().getMaximumValue()); if (today.getDayOfMonth() >= updateDay) { // number of months to give allowance (in the rare case this process fails to run for 2 months or more) int allowanceMonths = curMonth - updMonth; // give credits final int totalAllowance = allowance * allowanceMonths; giveCredits(totalAllowance); // update day lastAllowanceUpdate = lastAllowanceUpdate.plusMonths(allowanceMonths); // return the allowance given return totalAllowance; } } return 0; } ```

Original source