Revision: 8182
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=8182&view=rev
Author: efiring
Date: 2010-03-08 18:33:04 +0000 (Mon, 08 Mar 2010)
Log Message:
-----------
dates.py: fix num2jul, jul2num; fixes bug 2963391; thanks to G. Lichtenberg
Modified Paths:
--------------
trunk/matplotlib/lib/matplotlib/dates.py
Modified: trunk/matplotlib/lib/matplotlib/dates.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/dates.py 2010-03-08 18:09:55 UTC (rev
8181)
+++ trunk/matplotlib/lib/matplotlib/dates.py 2010-03-08 18:33:04 UTC (rev
8182)
@@ -3,8 +3,9 @@
Matplotlib provides sophisticated date plotting capabilities, standing
on the shoulders of python :mod:`datetime`, the add-on modules
:mod:`pytz` and :mod:`dateutils`. :class:`datetime` objects are
-converted to floating point numbers which represent the number of days
-since 0001-01-01 UTC. The helper functions :func:`date2num`,
+converted to floating point numbers which represent time in days
+since 0001-01-01 UTC, plus 1. For example, 0001-01-01, 06:00 is
+1.25, not 0.25. The helper functions :func:`date2num`,
:func:`num2date` and :func:`drange` are used to facilitate easy
conversion to and from :mod:`datetime` and numeric ranges.
@@ -225,7 +226,7 @@
*d* is either a :class:`datetime` instance or a sequence of datetimes.
Return value is a floating point number (or sequence of floats)
- which gives number of days (fraction part represents hours,
+ which gives one plus the number of days (fraction part represents hours,
minutes, seconds) since 0001-01-01 00:00:00 UTC.
"""
if not cbook.iterable(d): return _to_ordinalf(d)
@@ -235,17 +236,18 @@
def julian2num(j):
'Convert a Julian date (or sequence) to a matplotlib date (or sequence).'
if cbook.iterable(j): j = np.asarray(j)
- return j + 1721425.5
+ return j - 1721424.5
def num2julian(n):
'Convert a matplotlib date (or sequence) to a Julian date (or sequence).'
if cbook.iterable(n): n = np.asarray(n)
- return n - 1721425.5
+ return n + 1721424.5
def num2date(x, tz=None):
"""
- *x* is a float value which gives number of days (fraction part
- represents hours, minutes, seconds) since 0001-01-01 00:00:00 UTC.
+ *x* is a float value which gives one plus the number of days
+ (fraction part represents hours, minutes, seconds) since
+ 0001-01-01 00:00:00 UTC.
Return value is a :class:`datetime` instance in timezone *tz* (default to
rcparams TZ value).
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