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

# DaysBetween

 DaysBetween[{year1, month1, day1}, {year2, month2, day2}] gives the number of days between the dates {year1, month1, day1} and {year2, month2, day2}. DaysBetween[{year1, month1, day1, hour1, minute1, second1}, {year2, month2, day2, hour2, minute2, second2}] gives the number of days between the given dates.
• The following options can be given:
 Calendar Automatic specifies which calendar system to use
• The default calendar is the usual American calendar, but can be changed with the Calendar option.
Needs["Calendar`"]
The number of days between consecutive days is 1:
 Out[2]=

Needs["Calendar`"]
The number of days between the same date is 0:
 Out[2]=

Needs["Calendar`"]
If the second date is earlier than the first date, then a negative result is returned:
 Out[2]=

Needs["Calendar`"]
John F. Kennedy's presidency is referred to as lasting 1000 days:
 Out[2]=

Needs["Calendar`"]
Hours, minutes, and seconds do not affect DaysBetween:
 Out[2]=

Needs["Calendar`"]
In the default (Western/American) calendar 11 days were deleted in September 1752:
 Out[2]=

Needs["Calendar`"]
In the default (Western/American) calendar, 1752 had 355 days:
 Out[2]=
 Options   (4)