cron expression parsing into java date

Question

• my database having 10 18 16 ? * SUN,MON,WED,FRI * cron expression then how to convert into Java date.
• how to comparing with present day time.

Answer 1

You may want to look into the org.quartz.CronExpression class in the Quartz API.

Please note that you cannot simply compare a cron expression with a date because the cron expression (typically) represents a sequence of various dates. In any case, you may find the following methods useful:

public boolean isSatisfiedBy(Date date)
public Date getNextValidTimeAfter(Date date)

As for comparing two cron expressions, what would you like to compare? The only thing that IMO makes sense to compare are the next 'trigger' dates, i.e. dates obtained from getNextValidTimeAfter([some reference date]) calls.