how to calculate a minutes from the TimeStamp in java?

I want to calculate the number of minutes from the TimeStamp. How to do that? for exmple

I have a TimeStamp 开发者_运维问答value as 13/11/10 1:01 PM. I need to get that in minutes since the current time?

Hope I am clear THanks

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Timestamp is a java.util.Date with a bit more precision - so assuming you don't care too much about the nanos, just call getTime() on it to get the millis since the epoch:

long now = System.currentTimeMillis(); // See note below
long then = timestamp.getTime();

// Positive if 'now' is later than 'then',
// negative if 'then' is later than 'now'
long minutes = TimeUnit.MILLISECONDS.toMinutes(now - then);

Note that for testability, I personally wouldn't use System.currentTimeMillis - I'd have an interface (e.g. Clock) representing a "current time service", and inject that. You can then easily have a fake clock.

EDIT: I've assumed you've already got a parsed value. If you haven't, and only have a string, you'll need to parse it first. I'd personally recommend Joda Time as a rather better date and time API than the built-in stuff, unless you have a particular reason not to use it.

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Assuming the value is in String.

1. Parse that string using SimpleDateFormat's parse() method
2. get the time in long from your Date object using getTime()
3. Take a difference of System.currentTimeMillis() and the long received from getTime()
4. Divide that by 1000 and then 60

Assuming the value is in Timestamp, skip step 1 and 2. And notice s in Timestamp is in lowercase.

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You can use Timestamp.getTime() to get the time in milliseconds. System.currentTimeMillis() will give you the same thing for the current time. Subtract them and divide by 1000*60 to convert the milliseconds to minutes