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https://github.com/davidkeegan/dklrt
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85 lines
2.5 KiB
Python
Executable file
85 lines
2.5 KiB
Python
Executable file
#!/usr/bin/python
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# Time and Date Utilities (dklrt).
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# (c) David Keegan 2011-08-06.
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import sys, re
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from time import *
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import datetime
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import Misc
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ModuleName = __name__
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ReDateSep = '[-/]'
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ReDate = '\d{4}%s\d{1,2}%s\d{1,2}' % (ReDateSep, ReDateSep)
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RePeriod = '(\d+)([ymwd])'
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DateFormat = '%Y-%m-%d'
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DateFormatH = DateFormat + ' %H';
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DateFormatHm = DateFormatH + ':%M';
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DateFormatHms = DateFormatHm + ':%S';
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SecPerDay = 24 * 60 * 60
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def _Throw(Msg): Misc.Throw(Msg, ModuleName)
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def DateParse(Datestr):
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"""Converts a date string to seconds since the epoch."""
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Fs = DateFormat;
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if length(Datestr) > 16 : Fs = DateFormatHms;
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elif length(Datestr) > 13 : Fs = DateFormatHm;
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elif length(Datestr) > 10 : Fs = DateFormatH;
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return mktime(strptime(Datestr, Fs))
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def DateToText(Seconds):
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# Round seconds to integer first as we're truncating the time
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# component.
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return strftime(DateFormat, localtime(round(Seconds)))
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def DateToday():
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return DateParse(DateToText(time()))
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def DateAddPeriod(Seconds, Periodstr):
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"""Adds the period to the Seconds (a date)."""
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Match = re.match(RePeriod, Periodstr)
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if not Match: _Throw("Bad Period String: %s!", Periodstr)
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Count = int(Match.group(1))
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Unit = Match.group(2)
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Rv = Seconds
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if Unit == 'y': Rv = DateAddYears(Rv, Count)
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elif Unit== 'm': Rv = DateAddMonths(Rv, Count)
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elif Unit == 'w': Rv = Rv + (Count * SecPerDay * 7)
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elif Unit == 'd': Rv = Rv + (Count * SecPerDay)
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else: _Throw('Bad Period Unit: "%s"!' % Unit)
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return Rv
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def DateAddYears(Seconds, Count):
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"""Shifts Seconds (a date) forward by Count years.
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If Seconds is Feb 29, shifts to Feb 28, even if shifing to a
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leap year.
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"""
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if not isinstance(Count, (int, long)):
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_Throw("Count argument not an int!")
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dtd = datetime.date.fromtimestamp(Seconds)
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if not Count == 0:
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if (dtd.month == 2) and (dtd.day == 29):
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dtd = dtd.replace(day=28)
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dtd = dtd.replace(year=(dtd.year + Count))
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return mktime(dtd.timetuple())
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def DateAddMonths(Seconds, Count):
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"""Shifts Seconds (a date) forward by Count months.
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If the day is >= 29, shifts to 28.
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"""
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if not isinstance(Count, (int, long)):
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_Throw("Count argument not an int!")
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dtd = datetime.date.fromtimestamp(Seconds)
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if not Count == 0:
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if dtd.day >= 29: dtd = dtd.replace(day=28)
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Month = (dtd.month + Count) - 1
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Years = Month / 12
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dtd = dtd.replace(year=(dtd.year + Years))
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Month = (Month % 12) + 1
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dtd = dtd.replace(month=Month)
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return mktime(dtd.timetuple())
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