How do I change the time scale on my charts?

The time period of the information displayed (the x-axis of the graph) can be changed from as large as months to as little as a minute.

While displaying any chart using MetaTrader 4 there will be a time increment selection section in your toolbar.

It will look like this:

M1 will generate 1 candlestick every minute
M5 will generate 1 candlestick every 5 minutes
M15 will generate 1 candlestick every 15 minutes
M30 will generate 1 candlestick every 30 minutes
H1 will generate 1 candlestick every hour
H4 will generate 1 candlestick every 4 hours
D1 will generate 1 candlestick every day
W1 will generate 1 candlestick every week
MN will generate 1 candlestick every month