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Full Discussion: calendar in unix
Top Forums UNIX for Advanced & Expert Users calendar in unix Post 302496817 by pludi on Tuesday 15th of February 2011 10:52:04 AM
Old 02-15-2011
No epoch error, just remember the leap year calculations. 1900 was not a leap year (it's a leap year if the year is divisible by 4, but not 100, except when also divisible by 400), and so the time between January 1900 and January 1928 is missing 1 day (February 29th, 1900 doesn't exist). In March of the respective years the calendars match up again.

As for the original question: the cal utility only has to support dates between September 14, 1752 and December 31, 9999 (both Gregorian calendar):
Quote:
The cal utility shall write a calendar to standard output using the Julian calendar for dates from January 1, 1 through September 2, 1752 and the Gregorian calendar for dates from September 14, 1752 through December 31, 9999 as though the Gregorian calendar had been adopted on September 14, 1752.

Last edited by pludi; 02-15-2011 at 11:57 AM.. Reason: clarification
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cal(1)								   User Commands							    cal(1)

NAME
cal - display a calendar SYNOPSIS
cal [ [month] year] DESCRIPTION
The cal utility writes a Gregorian calendar to standard output. If the year operand is specified, a calendar for that year is written. If no operands are specified, a calendar for the current month is written. OPERANDS
The following operands are supported: month Specify the month to be displayed, represented as a decimal integer from 1 (January) to 12 (December). The default is the current month. year Specify the year for which the calendar is displayed, represented as a decimal integer from 1 to 9999. The default is the current year. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cal: LANG, LC_ALL, LC_CTYPE, LC_TIME, LC_MESSAGES, and NLSPATH. TZ Determine the timezone used to calculate the value of the current month. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
calendar(1), attributes(5), environ(5), standards(5) NOTES
An unusual calendar is printed for September 1752. That is the month 11 days were skipped to make up for lack of leap year adjustments. To see this calendar, type: cal 9 1752 The command cal 83 refers to the year 83, not 1983. The year is always considered to start in January. SunOS 5.11 1 Feb 1995 cal(1)
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