How to convert datetime to long value?

I wish to use the timestamp class, as the first method is deprecated, I wish to use the second one. What is the common way to convert the year, month, date, hour, minute, second, and nano to a long value?

Timestamp(int year, int month, int date, int hour, int minute, int second, int nano)
          Deprecated. instead use the constructor Timestamp(long millis)
Timestamp(long time)
          Constructs a Timestamp object using a milliseconds time value.
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Use a Calendar

long time = cal.getTimeInMillis();

(set Cal first of course)

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william007Author Commented:
Hi, may I know how to set the Calendar with the date information? as I can't see a direct way to do this from the calendar API.
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william007Author Commented:
Hi, I just miss it, the calendar class has a method
set(int year, int month, int date, int hourOfDay, int minute, int second)

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