High Quality Content by WIKIPEDIA articles! Flextime (or flexitime, flexi-time, originally derived from the German word Gleitzeit which literally means "sliding time") is a variable work schedule, in contrast to traditionalwork arrangements requiring employees to work a standard 9am to 5pm day. Its invention is usually credited to William Henning. Under flextime, there is typically a core period (of approximately 50% of total working time/working day) of the day when employees are expected to be at work (for example, between 11 am and 3pm), while 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.