This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.

# DateDifference

 DateDifference[date1, date2] gives the number of days from date1 to date2. DateDifference[date1, date2, "unit"]gives the difference between date1 and date2 in the specified unit. DateDifference[date1, date2, {"unit1", "unit2", ...}]gives the difference as a list with elements corresponding to the successive "uniti".
• Dates can be specified in the following forms:
 {y,m,d} year, month, day {y,m} the first day of the specified month {y} January 1 of the year y "string" date as a string ("Jan. 1, 2000") {y,m,d,h,m,s} precise time time absolute time specification
• Possible units are "Year", "Quarter", "Month", "Week", "Day", "Hour", "Minute", "Second".
• {y, m, d} is taken to be equivalent to {y, m, d, 0, 0, 0}, etc.
• DateDifference[date2] gives the fractional number of days from the current time until date2.
Give the number of days between January 1 and July 4:
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Use dates specified in {y, m, d} form:
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Find a date difference in units of weeks:
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If the second date is before the first, the date difference is negative:
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