Flexitime Plan from Wikipedia
Extract: "Flextime (or flexitime Flexi-time) is a variable work
schedule, in contrast to traditional work arrangements requiring employees to work
a standard 9am to 5pm day. Under flexitime, there is typically a core period of
the day when employees are expected to be at work (for example, between 10 am and
4pm), whilst the rest of the working day is "flexitime", in which employees can
choose when they work, subject to achieving total daily, weekly or monthly hours
in the region of what the employer expects, and subject to the necessary work being
done."
See Wikipedia Article.