Timer

A timer, comprising:

• a base;
• a dial, fixedly connected to the base, and comprising minute blocks and a first support;
• a driving shaft, rotatably mounted on the base, and selectably rotating relative to the base;
• and
• an indicator arm, comprising a second support and a plurality of hour blocks,
• wherein the first support comprises a first hollow arranged corresponding to the minute blocks, and the minute blocks are located in the first hollow and rotatably connected to the first support;
• the second support is rotatably connected to the driving shaft, the hour blocks each comprise a second block body and a second gear, the second block body is rotatably connected to the second support, the second gear is fixedly connected to the second block body, the second gear selectably rotates around the driving shaft, at least one second protrusion is correspondingly arranged on a rotation path of the second gear around the driving shaft, the second gear has second tooth grooves, and the second protrusion selectably extends into the second tooth grooves to drive the second gear to rotate relative to the second support so as to drive the hour blocks to rotate relative to the second support.