Do you get confused converting grid times to your local time?
The Grid Time Converter makes it easy.
Use the < > buttons to set the grid hour (outer numbers) adjacent to your local hour (inner numbers) and that's it.
For example: In the picture above (GMT)
10am Grid Time = 6pm Local
Obtainable from Fields Store
hop://hg.osgrid.org:80/Misty%20Isles/851/640/23