Ah I worked it out - you have to use the button down the bottom of the log dialog window that says "Show Range" or maybe "Show All". If you click the arrow next to the button you can then specify a date range.
The date filters at the top of the dialog box seem to only filter whatever you are currently looking at.
Refer to the screenshot below,
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…