PEAR date and time zone classes
Generic PEAR classes for representation and manipulation of dates,
times and time zones without the need of timestamps, which is a huge
limitation for php programs. Includes time zone data, time zone
conversions and many date/time conversions. It does not rely on 32-bit
system date stamps, so you can display calendars and compare dates that
date pre 1970 and post 2038. This package also provides a class to
convert date strings between Gregorian and Human calendar formats.