[[!redirects The Window Manager Time]] h6. [[WindowManager]] h6(. » [[WindowManager Technical Details|Technical Details]] h6((. » Time h2(#overview). Overview RISC OS actually has two clocks; # the hardware clock # the software clock. Both clocks are timed independently and can diverge by a few seconds per day. The clocks are only re-synchronised when the computer hardware is reset. h2(#usage). Usage Tasks that require the use of time and date settings should always use the time provided by the software clock. The software clock measures time in centi-seconds. *Note:* Times are represented using 32-bits, and it should be remembered that the number used can become negative (when bit 31 is set). So when comparing times, the expression <code>(new_time – old_time) > 100</code> is better than <code> new_time > old_time + 100 </code>