Trading times for all commodities can be viewed here: http://www.investing.com/commodities/futures-specifications
Clicking on any row (not on the instrument's name) will expand it to show all the specifications, including trading hours.
The charts themselves may have different open and close times as follows:
- The overview chart (on http://www.investing.com/commodities/crude-oil) shows the daily/weekly/monthly candles in GMT. Other candles are shown in local time (computer timezone).
- In the Streaming Chart (http://www.investing.com/commodities/crude-oil-streaming-chart) the timezone can be set by clicking on the Chart Properties button -> Timezone/Sessions.
- In the Interactive Chart (http://www.investing.com/commodities/crude-oil-advanced-chart) the candles are shown in local time (computer timezone).