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104 lines
2.7 KiB
104 lines
2.7 KiB
10 years ago
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#
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# wpylib.datetime0_idt
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# Created: 20141015
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# Wirawan Purwanto
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#
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# Simple date/time stamp using 64-bit integer.
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# This module is an internal module; the exported name will
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# be put in wpylib.datetime module.
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#
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"""
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wplib.datetime0_idt module
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Simple date/time stamp using 64-bit integer.
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The primary motivation of creating this class is to store date/time
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information in the most compact way, while keeping the ease of
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human readability.
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The internal format is very simple:
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YYYYMMDDhhmmssfff
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where:
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- YYYY = year (0 < YYYY <= 9999)
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- MM = month (1 <= MM <= 12)
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- DD = day
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- hh = hour (0 <= hh < 24)
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- mm = minutes
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- ss = seconds
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- fff = milliseconds
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The time is always expressed in terms of UTC to eliminate ambiguity of
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time zone, daylight savings time, etc.
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CAVEAT: The resolution of the time is only on the order of millisecond.
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This is a 17-decimal-digit integer, which fits in a 64-bit range (9.22e+18).
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"""
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from wpylib.params import struct
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class idatetime(object):
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"""Simple 8-byte integer representation of a date/time stamp.
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"""
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def __init__(self, idt=None):
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if idt != None:
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self.idt = idt
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def validate(self):
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raise NotImplementedError
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def split_values(self):
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"""Splits the compact datetime into components.
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Warning: the values are NOT validated.
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"""
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idt = self.idt
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s = str(idt)
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R = struct()
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#R.YYYY, R.MM, R.DD, R.hh, R.mm, R.ss, R.fff # names are too cryptic
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# Use same member names as in datetime (in sofar it is possible):
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R.year, R.month, R.day, R.hour, R.minute, R.second, R.millisecond = map(int, [
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s[:-13], # year
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s[-13:-11], # month
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s[-11:-9], # day
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s[-9:-7], # hour
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s[-7:-5], # min
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s[-5:-3], # sec
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s[-3:] # millisec
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])
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R.microsecond = R.millisecond * 1000
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return R
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def to_datetime(self):
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"""Converts the object value to standard python datetime object.
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"""
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from datetime import datetime
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R = self.split_values()
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dt = datetime(R.year, R.month, R.day, R.hour, R.minute, R.second, R.microsecond)
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'''
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idt = self.idt
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s = str(idt)
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YYYY, MM, DD, hh, mm, ss, ms = map(int, [
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s[:-13], # year
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s[-13:-11], # month
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s[-11:-9], # day
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s[-9:-7], # hour
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s[-7:-5], # min
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s[-5:-3], # sec
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s[-3:] # millisec
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])
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dt = datetime(YYYY, MM, DD, hh, mm, ss, fff*1000)
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'''
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return dt
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def str_iso8601(self):
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"""Outputs the object according to ISO-8601 combined date/time format.
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No time zone is shown."""
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R = self.split_values()
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fmt = "%(year)04d-%(month)02d-%(day)02dT%(hour)02d:%(minute)02d:%(second)02d.%(millisecond)03d"
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return fmt % R
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