The famous Y2K bug occurred because some old programs used two decimal digits to

Question

The famous Y2K bug occurred because some old programs used two decimal digits to store years. This became a problem in the year 2000, because such programs had no way to tell whether "00" meant 1900 or 2000.

A similar problem will occur for Java programs when the number of milliseconds since the beginning of 1970 exceeds the capacity of a long. In what year will this occur, given that the maximum value of a long is 9,223,372,036,854,775,807? What if getTime() returned an int, which has a maximum value of 2,147,483,647? What about those UNIX/C systems which use an int to store the number of seconds since the beginning of 1970?

Explanation / Answer

Part 1: Java Program Time Overflow if Long Data type is used to store the time:

Maximum Number that can be stored in long datatype :9,223,372,036,854,775,807

Number of millisecons in 1 year = 365*24*60*60*1000=

3153600000 msec

Total number of years befor it overflow : 2924712087 years

Part 2: If Int has been used instead of Long then It has been overflow withinn a year i.e 1971 itself.

Total number of years befor it overflow :

Part 3:

If Unix system might have used int to store second then

The years on which it will overflow is 0.6*1000=600 years after 1970.

Maximum Number that can be stored in long datatype :9,223,372,036,854,775,807

Number of millisecons in 1 year = 365*24*60*60*1000=

3153600000 msec

Total number of years befor it overflow : 2924712087 years

Part 2: If Int has been used instead of Long then It has been overflow withinn a year i.e 1971 itself.

Total number of years befor it overflow :

Part 3:

If Unix system might have used int to store second then

The years on which it will overflow is 0.6*1000=600 years after 1970.

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