Greets Folks,

I've been wrestling with how to better control plotting of time data and 
just can't seem to see the right path. My dataset has thousands of points 
distributes across a number of years. I would like to plot the responses 
according to increasing time with nice boundaries - perhaps integer months 
- along the abscissa. However, the earliest time occurs mid-month and I 
cannot figure out how to properly truncate the minimum date in the dataset 
to an integer month for use in the xlim= and at= statements to set the 
plotting range on month boundaries.

Thanks in advance for your help or advice.

Best Regards,
Steve
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