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.TH lunar 1 "28 October 2001"
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lunar (version 2.2) \- a calendar conversion utility
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program performs date conversion between the Gregorian Solar Calendar (SC)
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and the Chinese Lunar Calendar (LC).
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Given a date in either calendar, the program also
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outputs the corresponding "shengxiao" (animal of the year)
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and "ganzhi" characters.
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The date range currently covered is from about 1900 A.D. to 2049 A.D.
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For the sake of convenience, we choose the convention such that the solar
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and lunar year numbers of the first day of a lunar year are the same.
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For example, SC 1991.2.15 is LC 1991.1.1,
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while SC 1991.2.14 is LC 1990.12.30.
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Moreover, we choose the convention such that the solar and lunar hour numbers
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(in 24-hour clock) of a date are the same, although a lunar day starts
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at 23:00 of a solar day. This means that SC 1991.2.15.23 is LC 1991.1.2.23,
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while SC 1991.2.16.0 is LC 1991.1.2.0,
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and SC 1991.2.16.1 is LC 1991.1.2.1.
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The standard time of the Lunar Calendar is
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Beijing (Hong Kong) Standard Time, not GMT.
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Be sure to adjust appropriately for other time zones
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and "Day-light Saving Time".
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In the Lunar Calendar,
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a normal year has 12 months, and a leap year (run-nian) has 13 months,
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where the extra month is called a "leap month" (run-yue).
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For example, the leap month that follows immediately the 6-th lunar month
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is called the 6-th leap month.
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A (leap) month is either a short or long one, which has 29 or 30 days
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There are 10 gan's and 12 zhi's.
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The ganzhi labeling of the year, month, day and hour of a date
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is a member of the Cartesian product GxGxGxG, where G = {1,2,...,60}.
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For example, "jia-zi" is 1, "yi-chou" is 2, and so on.
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The ganzhi of the j-th leap month is the same as that of the j-th month.
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The possible options are
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output ganzhi in special "bitmap" characters.
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output hanzi or Chinese characters encoded in (highest-bit-set) GB code.
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convert a lunar date to solar date.
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The default is to convert a solar date to a lunar date.
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indicate the month is a lunar leap month.
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This option is meaningful only when the "-i" option is used.
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Copyright (C) 1988, 1989, 1991, 1992, 2001 Fung F. Lee and Ricky Yeung
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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The last version of this program was released on July 23, 1992 as
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version 2.1a. This program was first released under the terms of
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GNU GPL on October 28, 2001 as version 2.2. Both versions are identical
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except for the license text.
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Fung F. Lee and Ricky Yeung
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The special "bitmap" file "lunar.bitmap" was contributed by Weimin Liu.
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Special thanks to Hwei Chen Ti who extended the tables from 2001 to 2049.
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Bug reports and comments should be sent to lee@umunhum.stanford.edu.
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This software has no connection with our employers.