Display number of days between dates
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			^dtdiff^ date1 date2

displays the number of days between two formatted dates.  Each date is 
specified in yymmdd format.  Year estimate assumes 365.25 days per year.

	. ^dtdiff 910505 910701^

	Difference in Days is:        57
	Difference in Weeks is:     8.14
	Difference in Years is:    0.156

Warning
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^dtdiff^ calculates the number of days up to, but not including, the second
date.