"""
Matplotlib provides sophisticated date plotting capabilities, standing
on the shoulders of python datetime, the add-on modules pytz and
dateutils. datetime objects are converted to floating point numbers
which represent the number of days since 0001-01-01 UTC. The helper
functions date2num, num2date and drange are used to facilitate easy
conversion to and from datetime and numeric ranges.
A wide range of specific and general purpose date tick locators and
formatters are provided in this module. See matplotlib.tickers for
general information on tick locators and formatters. These are
described below.
All the matplotlib date converters, tickers and formatters are
timezone aware, and the default timezone is given by the timezone
parameter in your matplotlibrc file. If you leave out a tz timezone
instance, the default from your rc file will be assumed. If you want
to use a custom time zone, pass a pytz.timezone instance
with the tz keyword argument to num2date, plot_date, and any custom
date tickers or locators you create. See http://pytz.sourceforge.net
for information on pytz and timezone handling.
The dateutil module (http://labix.org/python-dateutil)
provides additional code to handle
date ticking, making it easy to place ticks on any kinds of dates -
see examples below.
Date tickers -
Most of the date tickers can locate single or multiple values. Eg
# tick on mondays every week
loc = WeekdayLocator(byweekday=MO, tz=tz)
# tick on mondays and saturdays
loc = WeekdayLocator(byweekday=(MO, SA))
In addition, most of the constructors take an interval argument.
# tick on mondays every second week
loc = WeekdayLocator(byweekday=MO, interval=2)
The rrule locator allows completely general date ticking
# tick every 5th easter
rule = rrulewrapper(YEARLY, byeaster=1, interval=5)
loc = RRuleLocator(rule)
Here are all the date tickers
* MinuteLocator - locate minutes
* HourLocator - locate hours
* DayLocator - locate specifed days of the month
* WeekdayLocator - Locate days of the week, eg MO, TU
* MonthLocator - locate months, eg 7 for july
* YearLocator - locate years that are multiples of base
* RRuleLocator - locate using a matplotlib.dates.rrulewrapper.
The rrulewrapper is a simple wrapper around a dateutils.rrule
https://moin.conectiva.com.br/DateUtil which allow almost
arbitrary date tick specifications. See
examples/date_demo_rrule.py
Date formatters
DateFormatter - use strftime format strings
DateIndexFormatter - date plots with implicit x indexing.
"""
import sys, re, time, math, datetime
import locale
import pytz
import matplotlib
import numpy as npy
import matplotlib.units as units
import matplotlib.cbook as cbook
import matplotlib.ticker as ticker
from pytz import timezone
from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY, \
MONTHLY, WEEKLY, DAILY, HOURLY, MINUTELY, SECONDLY
from dateutil.relativedelta import relativedelta
import dateutil.parser
__all__ = ( 'date2num', 'num2date', 'drange', 'epoch2num',
'num2epoch', 'mx2num', 'DateFormatter',
'IndexDateFormatter', 'DateLocator', 'RRuleLocator',
'YearLocator', 'MonthLocator', 'WeekdayLocator',
'DayLocator', 'HourLocator', 'MinuteLocator',
'SecondLocator', 'rrule', 'MO', 'TU', 'WE', 'TH', 'FR',
'SA', 'SU', 'YEARLY', 'MONTHLY', 'WEEKLY', 'DAILY',
'HOURLY', 'MINUTELY', 'SECONDLY', 'relativedelta',
'seconds', 'minutes', 'hours', 'weeks')
UTC = pytz.timezone('UTC')
def _get_rc_timezone():
s = matplotlib.rcParams['timezone']
return pytz.timezone(s)
HOURS_PER_DAY = 24.
MINUTES_PER_DAY = 60.*HOURS_PER_DAY
SECONDS_PER_DAY = 60.*MINUTES_PER_DAY
MUSECONDS_PER_DAY = 1e6*SECONDS_PER_DAY
SEC_PER_MIN = 60
SEC_PER_HOUR = 3600
SEC_PER_DAY = SEC_PER_HOUR * 24
SEC_PER_WEEK = SEC_PER_DAY * 7
MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY = (
MO, TU, WE, TH, FR, SA, SU)
WEEKDAYS = (MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY)
def _to_ordinalf(dt):
"""
convert datetime to the Gregorian date as UTC float days,
preserving hours, minutes, seconds and microseconds. return value
is a float
"""
if hasattr(dt, 'tzinfo') and dt.tzinfo is not None:
delta = dt.tzinfo.utcoffset(dt)
if delta is not None:
dt -= delta
base = float(dt.toordinal())
if hasattr(dt, 'hour'):
base += (dt.hour/HOURS_PER_DAY + dt.minute/MINUTES_PER_DAY +
dt.second/SECONDS_PER_DAY + dt.microsecond/MUSECONDS_PER_DAY
)
return base
def _from_ordinalf(x, tz=None):
"""
convert Gregorian float of the date, preserving hours, minutes,
seconds and microseconds. return value is a datetime
"""
if tz is None: tz = _get_rc_timezone()
ix = int(x)
dt = datetime.datetime.fromordinal(ix)
remainder = float(x) - ix
hour, remainder = divmod(24*remainder, 1)
minute, remainder = divmod(60*remainder, 1)
second, remainder = divmod(60*remainder, 1)
microsecond = int(1e6*remainder)
if microsecond<10: microsecond=0
dt = datetime.datetime(
dt.year, dt.month, dt.day, int(hour), int(minute), int(second),
microsecond, tzinfo=UTC).astimezone(tz)
if microsecond>999990:
dt += datetime.timedelta(microseconds=1e6-microsecond)
return dt
00173 class strpdate2num:
"""
Use this class to parse date strings to matplotlib datenums when
you know the date format string of the date you are parsing. See
examples/load_demo.py
"""
00179 def __init__(self, fmt):
""" fmt: any valid strptime format is supported """
self.fmt = fmt
00183 def __call__(self, s):
"""s : string to be converted
return value: a date2num float
"""
return date2num(datetime.datetime(*time.strptime(s, self.fmt)[:6]))
def datestr2num(d):
"""
Convert a date string to a datenum using dateutil.parser.parse
d can be a single string or a sequence of strings
"""
if cbook.is_string_like(d):
dt = dateutil.parser.parse(d)
return date2num(dt)
else:
return date2num([dateutil.parser.parse(s) for s in d])
def date2num(d):
"""
d is either a 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,
minutes, seconds) since 0001-01-01 00:00:00 UTC
"""
if not cbook.iterable(d): return _to_ordinalf(d)
else: return npy.asarray([_to_ordinalf(val) for val in d])
def julian2num(j):
'convert a Julian date (or sequence) to a matplotlib date (or sequence)'
if cbook.iterable(j): j = npy.asarray(j)
return j + 1721425.5
def num2julian(n):
'convert a matplotlib date (or seguence) to a Julian date (or sequence)'
if cbook.iterable(n): n = npy.asarray(n)
return n - 1721425.5
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
Return value is a datetime instance in timezone tz (default to
rcparams TZ value)
if x is a sequence, a sequence of datetimes will be returned
"""
if tz is None: tz = _get_rc_timezone()
if not cbook.iterable(x): return _from_ordinalf(x, tz)
else: return [_from_ordinalf(val, tz) for val in x]
def drange(dstart, dend, delta):
"""
Return a date range as float gregorian ordinals. dstart and dend
are datetime instances. delta is a datetime.timedelta instance
"""
step = (delta.days + delta.seconds/SECONDS_PER_DAY +
delta.microseconds/MUSECONDS_PER_DAY)
f1 = _to_ordinalf(dstart)
f2 = _to_ordinalf(dend)
return npy.arange(f1, f2, step)
00254 class DateFormatter(ticker.Formatter):
"""
Tick location is seconds since the epoch. Use a strftime format
string
python only supports datetime strftime formatting for years
greater than 1900. Thanks to Andrew Dalke, Dalke Scientific
Software who contributed the strftime code below to include dates
earlier than this year
"""
illegal_s = re.compile(r"((^|[^%])(%%)*%s)")
00267 def __init__(self, fmt, tz=None):
"""
fmt is an strftime format string; tz is the tzinfo instance
"""
if tz is None: tz = _get_rc_timezone()
self.fmt = fmt
self.tz = tz
def __call__(self, x, pos=0):
dt = num2date(x, self.tz)
return self.strftime(dt, self.fmt)
def set_tzinfo(self, tz):
self.tz = tz
def _findall(self, text, substr):
sites = []
i = 0
while 1:
j = text.find(substr, i)
if j == -1:
break
sites.append(j)
i=j+1
return sites
def strftime(self, dt, fmt):
fmt = self.illegal_s.sub(r"\1", fmt)
fmt = fmt.replace("%s", "s")
if dt.year > 1900:
return cbook.unicode_safe(dt.strftime(fmt))
year = dt.year
delta = 2000 - year
off = 6*(delta // 100 + delta // 400)
year = year + off
year = year + ((2000 - year)//28)*28
timetuple = dt.timetuple()
s1 = time.strftime(fmt, (year,) + timetuple[1:])
sites1 = self._findall(s1, str(year))
s2 = time.strftime(fmt, (year+28,) + timetuple[1:])
sites2 = self._findall(s2, str(year+28))
sites = []
for site in sites1:
if site in sites2:
sites.append(site)
s = s1
syear = "%4d" % (dt.year,)
for site in sites:
s = s[:site] + syear + s[site+4:]
return cbook.unicode_safe(s)
00335 class IndexDateFormatter(ticker.Formatter):
"""
Use with IndexLocator to cycle format strings by index.
"""
00339 def __init__(self, t, fmt, tz=None):
"""
t is a sequence of dates floating point days). fmt is a
strftime format string
"""
if tz is None: tz = _get_rc_timezone()
self.t = t
self.fmt = fmt
self.tz = tz
def __call__(self, x, pos=0):
'Return the label for time x at position pos'
ind = int(round(x))
if ind>=len(self.t) or ind<=0: return ''
dt = num2date(self.t[ind], self.tz)
return cbook.unicode_safe(dt.strftime(self.fmt))
00360 class AutoDateFormatter(ticker.Formatter):
"""
This class attempt to figure out the best format to use. This is
most useful when used with the AutoDateLocator.
"""
def __init__(self, locator, tz=None):
self._locator = locator
self._formatter = DateFormatter("%b %d %Y %H:%M:%S %Z", tz)
self._tz = tz
def __call__(self, x, pos=0):
scale = float( self._locator._get_unit() )
if ( scale == 365.0 ):
self._formatter = DateFormatter("%Y", self._tz)
elif ( scale == 30.0 ):
self._formatter = DateFormatter("%b %Y", self._tz)
elif ( (scale == 1.0) or (scale == 7.0) ):
self._formatter = DateFormatter("%b %d %Y", self._tz)
elif ( scale == (1.0/24.0) ):
self._formatter = DateFormatter("%H:%M:%S %Z", self._tz)
elif ( scale == (1.0/(24*60)) ):
self._formatter = DateFormatter("%H:%M:%S %Z", self._tz)
elif ( scale == (1.0/(24*3600)) ):
self._formatter = DateFormatter("%H:%M:%S %Z", self._tz)
else:
self._formatter = DateFormatter("%b %d %Y %H:%M:%S %Z", self._tz)
return self._formatter(x, pos)
class rrulewrapper:
def __init__(self, freq, **kwargs):
self._construct = kwargs.copy()
self._construct["freq"] = freq
self._rrule = rrule(**self._construct)
def set(self, **kwargs):
self._construct.update(kwargs)
self._rrule = rrule(**self._construct)
def __getattr__(self, name):
if name in self.__dict__:
return self.__dict__[name]
return getattr(self._rrule, name)
class DateLocator(ticker.Locator):
hms0d = {'byhour':0, 'byminute':0,'bysecond':0}
def __init__(self, tz=None):
"""
tz is the tzinfo instance
"""
if tz is None: tz = _get_rc_timezone()
self.tz = tz
def set_tzinfo(self, tz):
self.tz = tz
def datalim_to_dt(self):
self.verify_intervals()
dmin, dmax = self.dataInterval.get_bounds()
return num2date(dmin, self.tz), num2date(dmax, self.tz)
def viewlim_to_dt(self):
self.verify_intervals()
vmin, vmax = self.viewInterval.get_bounds()
return num2date(vmin, self.tz), num2date(vmax, self.tz)
def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 1
def nonsingular(self, vmin, vmax):
unit = self._get_unit()
vmin -= 2*unit
vmax += 2*unit
return vmin, vmax
class RRuleLocator(DateLocator):
def __init__(self, o, tz=None):
DateLocator.__init__(self, tz)
self.rule = o
def __call__(self):
self.verify_intervals()
try: dmin, dmax = self.viewlim_to_dt()
except ValueError: return []
if dmin>dmax:
dmax, dmin = dmin, dmax
delta = relativedelta(dmax, dmin)
self.rule.set(dtstart=dmin-delta, until=dmax+delta)
dates = self.rule.between(dmin, dmax, True)
return date2num(dates)
def _get_unit(self):
"""
Return how many days a unit of the locator is; use for
intelligent autoscaling
"""
freq = self.rule._rrule._freq
if ( freq == YEARLY ):
return 365
elif ( freq == MONTHLY ):
return 30
elif ( freq == WEEKLY ):
return 7
elif ( freq == DAILY ):
return 1
elif ( freq == HOURLY ):
return (1.0/24.0)
elif ( freq == MINUTELY ):
return (1.0/(24*60))
elif ( freq == SECONDLY ):
return (1.0/(24*3600))
else:
return -1
def autoscale(self):
"""
Set the view limits to include the data range
"""
self.verify_intervals()
dmin, dmax = self.datalim_to_dt()
if dmin>dmax:
dmax, dmin = dmin, dmax
delta = relativedelta(dmax, dmin)
self.rule.set(dtstart=dmin-delta, until=dmax+delta)
dmin, dmax = self.datalim_to_dt()
vmin = self.rule.before(dmin, True)
if not vmin: vmin=dmin
vmax = self.rule.after(dmax, True)
if not vmax: vmax=dmax
vmin = date2num(vmin)
vmax = date2num(vmax)
return self.nonsingular(vmin, vmax)
00525 class AutoDateLocator(DateLocator):
"""
On autoscale this class picks the best MultipleDateLocator to set the
view limits and the tick locs.
"""
def __init__(self, tz=None):
DateLocator.__init__(self, tz)
self._locator = YearLocator()
self._freq = YEARLY
def __call__(self):
'Return the locations of the ticks'
self.refresh()
return self._locator()
def refresh(self):
'refresh internal information based on current lim'
dmin, dmax = self.viewlim_to_dt()
self._locator = self.get_locator(dmin, dmax)
def _get_unit(self):
if ( self._freq == YEARLY ):
return 365.0
elif ( self._freq == MONTHLY ):
return 30.0
elif ( self._freq == WEEKLY ):
return 7.0
elif ( self._freq == DAILY ):
return 1.0
elif ( self._freq == HOURLY ):
return 1.0/24
elif ( self._freq == MINUTELY ):
return 1.0/(24*60)
elif ( self._freq == SECONDLY ):
return 1.0/(24*3600)
else:
return -1
def autoscale(self):
'Try to choose the view limits intelligently'
self.verify_intervals()
dmin, dmax = self.datalim_to_dt()
self._locator = self.get_locator(dmin, dmax)
return self._locator.autoscale()
def get_locator(self, dmin, dmax):
'pick the best locator based on a distance'
delta = relativedelta(dmax, dmin)
numYears = (delta.years * 1.0)
numMonths = (numYears * 12.0) + delta.months
numDays = (numMonths * 31.0) + delta.days
numHours = (numDays * 24.0) + delta.hours
numMinutes = (numHours * 60.0) + delta.minutes
numSeconds = (numMinutes * 60.0) + delta.seconds
numticks = 5
interval = 1
bymonth = 1
bymonthday = 1
byhour = 0
byminute = 0
bysecond = 0
if ( numYears >= numticks ):
self._freq = YEARLY
elif ( numMonths >= numticks ):
self._freq = MONTHLY
bymonth = range(1, 13)
if ( (0 <= numMonths) and (numMonths <= 14) ):
interval = 1
elif ( (15 <= numMonths) and (numMonths <= 29) ):
interval = 3
elif ( (30 <= numMonths) and (numMonths <= 44) ):
interval = 4
else:
interval = 6
elif ( numDays >= numticks ):
self._freq = DAILY
bymonth = None
bymonthday = range(1, 32)
if ( (0 <= numDays) and (numDays <= 9) ):
interval = 1
elif ( (10 <= numDays) and (numDays <= 19) ):
interval = 2
elif ( (20 <= numDays) and (numDays <= 49) ):
interval = 3
elif ( (50 <= numDays) and (numDays <= 99) ):
interval = 7
else:
interval = 14
elif ( numHours >= numticks ):
self._freq = HOURLY
bymonth = None
bymonthday = None
byhour = range(0, 24)
if ( (0 <= numHours) and (numHours <= 14) ):
interval = 1
elif ( (15 <= numHours) and (numHours <= 30) ):
interval = 2
elif ( (30 <= numHours) and (numHours <= 45) ):
interval = 3
elif ( (45 <= numHours) and (numHours <= 68) ):
interval = 4
elif ( (68 <= numHours) and (numHours <= 90) ):
interval = 6
else:
interval = 12
elif ( numMinutes >= numticks ):
self._freq = MINUTELY
bymonth = None
bymonthday = None
byhour = None
byminute = range(0, 60)
if ( numMinutes > (10.0 * numticks) ):
interval = 10
elif ( numSeconds >= numticks ):
self._freq = SECONDLY
bymonth = None
bymonthday = None
byhour = None
byminute = None
bysecond = range(0, 60)
if ( numSeconds > (10.0 * numticks) ):
interval = 10
else:
pass
rrule = rrulewrapper( self._freq, interval=interval, \
dtstart=dmin, until=dmax, \
bymonth=bymonth, bymonthday=bymonthday, \
byhour=byhour, byminute = byminute, \
bysecond=bysecond )
locator = RRuleLocator(rrule, self.tz)
locator.set_view_interval(self.viewInterval)
locator.set_data_interval(self.dataInterval)
return locator
00676 class YearLocator(DateLocator):
"""
Make ticks on a given day of each year that is a multiple of base.
Examples:
# Tick every year on Jan 1st
locator = YearLocator()
# Tick every 5 years on July 4th
locator = YearLocator(5, month=7, day=4)
"""
00689 def __init__(self, base=1, month=1, day=1, tz=None):
"""
mark years that are multiple of base on a given month and day
(default jan 1)
"""
DateLocator.__init__(self, tz)
self.base = ticker.Base(base)
self.replaced = { 'month' : month,
'day' : day,
'hour' : 0,
'minute' : 0,
'second' : 0,
'tzinfo' : tz
}
00705 def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 365
def __call__(self):
self.verify_intervals()
dmin, dmax = self.viewlim_to_dt()
ymin = self.base.le(dmin.year)
ymax = self.base.ge(dmax.year)
ticks = [dmin.replace(year=ymin, **self.replaced)]
while 1:
dt = ticks[-1]
if dt.year>=ymax: return date2num(ticks)
year = dt.year + self.base.get_base()
ticks.append(dt.replace(year=year, **self.replaced))
00727 def autoscale(self):
"""
Set the view limits to include the data range
"""
self.verify_intervals()
dmin, dmax = self.datalim_to_dt()
ymin = self.base.le(dmin.year)
ymax = self.base.ge(dmax.year)
vmin = dmin.replace(year=ymin, **self.replaced)
vmax = dmax.replace(year=ymax, **self.replaced)
vmin = date2num(vmin)
vmax = date2num(vmax)
return self.nonsingular(vmin, vmax)
00743 class MonthLocator(RRuleLocator):
"""
Make ticks on occurances of each month month, eg 1, 3, 12
"""
00747 def __init__(self, bymonth=None, bymonthday=1, interval=1, tz=None):
"""
mark every month in bymonth; bymonth can be an int or
sequence. default is range(1,13), ie every month
interval is the interval between each iteration. Eg, if
interval=2, mark every second occurance
"""
if bymonth is None: bymonth=range(1,13)
o = rrulewrapper(MONTHLY, bymonth=bymonth, bymonthday=bymonthday,
interval=interval, **self.hms0d)
RRuleLocator.__init__(self, o, tz)
00760 def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 30
00768 class WeekdayLocator(RRuleLocator):
"""
Make ticks on occurances of each weekday
"""
00773 def __init__(self, byweekday=1, interval=1, tz=None):
"""
mark every weekday in byweekday; byweekday can be a number or
sequence
elements of byweekday must be one of MO, TU, WE, TH, FR, SA,
SU, the constants from dateutils.rrule
interval specifies the number of weeks to skip. Ie interval=2
plots every second week
"""
o = rrulewrapper(DAILY, byweekday=byweekday,
interval=interval, **self.hms0d)
RRuleLocator.__init__(self, o, tz)
00789 def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 7
00797 class DayLocator(RRuleLocator):
"""
Make ticks on occurances of each day of the month, eg 1, 15, 30
"""
00801 def __init__(self, bymonthday=None, interval=1, tz=None):
"""
mark every day in bymonthday; bymonthday can be an int or sequence
Default is to tick every day of the month - bymonthday=range(1,32)
"""
if bymonthday is None: bymonthday=range(1,32)
o = rrulewrapper(DAILY, bymonthday=bymonthday,
interval=interval, **self.hms0d)
RRuleLocator.__init__(self, o, tz)
00812 def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 1
00819 class HourLocator(RRuleLocator):
"""
Make ticks on occurances of each hour
"""
00823 def __init__(self, byhour=None, interval=1, tz=None):
"""
mark every hour in byhour; byhour can be an int or sequence.
Default is to tick every hour - byhour=range(24)
interval is the interval between each iteration. Eg, if
interval=2, mark every second occurance
"""
if byhour is None: byhour=range(24)
rule = rrulewrapper(HOURLY, byhour=byhour, interval=interval,
byminute=0, bysecond=0)
RRuleLocator.__init__(self, rule, tz)
00836 def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 1/24.
00843 class MinuteLocator(RRuleLocator):
"""
Make ticks on occurances of each minute
"""
00847 def __init__(self, byminute=None, interval=1, tz=None):
"""
mark every minute in byminute; byminute can be an int or
sequence. default is to tick every minute - byminute=range(60)
interval is the interval between each iteration. Eg, if
interval=2, mark every second occurance
"""
if byminute is None: byminute=range(60)
rule = rrulewrapper(MINUTELY, byminute=byminute, interval=interval,
bysecond=0)
RRuleLocator.__init__(self, rule, tz)
00861 def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 1./(24*60)
00868 class SecondLocator(RRuleLocator):
"""
Make ticks on occurances of each second
"""
00872 def __init__(self, bysecond=None, interval=1, tz=None):
"""
mark every second in bysecond; bysecond can be an int or
sequence. Default is to tick every second bysecond = range(60)
interval is the interval between each iteration. Eg, if
interval=2, mark every second occurance
"""
if bysecond is None: bysecond=range(60)
rule = rrulewrapper(SECONDLY, bysecond=bysecond, interval=interval)
RRuleLocator.__init__(self, rule, tz)
00885 def _get_unit(self):
"""
return how many days a unit of the locator is; use for
intelligent autoscaling
"""
return 1./(24*60*60)
def _close_to_dt(d1, d2, epsilon=5):
'assert that datetimes d1 and d2 are within epsilon microseconds'
delta = d2-d1
mus = abs(delta.days*MUSECONDS_PER_DAY + delta.seconds*1e6 +
delta.microseconds)
assert(mus<epsilon)
def _close_to_num(o1, o2, epsilon=5):
'assert that float ordinals o1 and o2 are within epsilon microseconds'
delta = abs((o2-o1)*MUSECONDS_PER_DAY)
assert(delta<epsilon)
def epoch2num(e):
"""
convert an epoch or sequence of epochs to the new date format,
days since 0001
"""
spd = 24.*3600.
return 719163 + npy.asarray(e)/spd
def num2epoch(d):
"""
convert days since 0001 to epoch. d can be a number or sequence
"""
spd = 24.*3600.
return (npy.asarray(d)-719163)*spd
def mx2num(mxdates):
"""
Convert mx datetime instance (or sequence of mx instances) to the
new date format,
"""
scalar = False
if not cbook.iterable(mxdates):
scalar = True
mxdates = [mxdates]
ret = epoch2num([m.ticks() for m in mxdates])
if scalar: return ret[0]
else: return ret
def date_ticker_factory(span, tz=None, numticks=5):
"""
Create a date locator with numticks (approx) and a date formatter
for span in days. Return value is (locator, formatter)
"""
if span==0: span = 1/24.
minutes = span*24*60
hours = span*24
days = span
weeks = span/7.
months = span/31.
years = span/365.
if years>numticks:
locator = YearLocator(int(years/numticks), tz=tz)
fmt = '%Y'
elif months>numticks:
locator = MonthLocator(tz=tz)
fmt = '%b %Y'
elif weeks>numticks:
locator = WeekdayLocator(tz=tz)
fmt = '%a, %b %d'
elif days>numticks:
locator = DayLocator(interval=int(math.ceil(days/numticks)), tz=tz)
fmt = '%b %d'
elif hours>numticks:
locator = HourLocator(interval=int(math.ceil(hours/numticks)), tz=tz)
fmt = '%H:%M\n%b %d'
elif minutes>numticks:
locator = MinuteLocator(interval=int(math.ceil(minutes/numticks)), tz=tz)
fmt = '%H:%M:%S'
else:
locator = MinuteLocator(tz=tz)
fmt = '%H:%M:%S'
formatter = DateFormatter(fmt, tz=tz)
return locator, formatter
def seconds(s):
'return seconds as days'
return float(s)/SEC_PER_DAY
def minutes(m):
'return minutes as days'
return float(m)/MINUTES_PER_DAY
def hours(h):
'return hours as days'
return h/24.
def weeks(w):
'return weeks as days'
return w*7.
class DateConverter(units.ConversionInterface):
def axisinfo(unit):
'return the unit AxisInfo'
if unit=='date':
majloc = AutoDateLocator()
majfmt = AutoDateFormatter(majloc)
return units.AxisInfo(
majloc = majloc,
majfmt = majfmt,
label='date',
)
else: return None
axisinfo = staticmethod(axisinfo)
def convert(value, unit):
if units.ConversionInterface.is_numlike(value): return value
return date2num(value)
convert = staticmethod(convert)
def default_units(x):
'return the default unit for x or None'
return 'date'
default_units = staticmethod(default_units)
units.registry[datetime.date] = DateConverter()
units.registry[datetime.datetime] = DateConverter()
if __name__=='__main__':
tz = pytz.timezone('US/Pacific')
dt = datetime.datetime(1011, 10, 9, 13, 44, 22, 101010, tzinfo=tz)
x = date2num(dt)
_close_to_dt(dt, num2date(x, tz))
d1 = datetime.datetime( 2000, 3, 1, tzinfo=tz)
d2 = datetime.datetime( 2000, 3, 5, tzinfo=tz)
delta = datetime.timedelta(hours=6)
dates = drange(d1, d2, delta)
from _transforms import Value, Interval
v1 = Value(date2num(d1))
v2 = Value(date2num(d2))
dlim = Interval(v1,v2)
vlim = Interval(v1,v2)
locator = DayLocator(tz=tz)
locator.set_data_interval(dlim)
locator.set_view_interval(vlim)
dmin, dmax = locator.autoscale()
vlim.set_bounds(dmin, dmax)
ticks = locator()
fmt = '%Y-%m-%d %H:%M:%S %Z'
formatter = DateFormatter(fmt, tz)
for t in dates: print formatter(t)