unittest for time strftime helper functions escape text to deal with possible locale values that have regex syntax while allowing regex syntax used for comparison we must update the local variables on every cycle make sure any characters that could be taken as regex syntax is escaped in escapestr c see below x see below z see below mustn t raise a value error these are standard but don t have predictable output these are some platform specific extensions a limitation of the ms c runtime library is that it crashes if a date before 1900 is passed with a format string containing y issue 13674 19634 helper functions escape text to deal with possible locale values that have regex syntax while allowing regex syntax used for comparison we must update the local variables on every cycle make sure any characters that could be taken as regex syntax is escaped in escapestr c see below x see below z see below mustn t raise a value error these are standard but don t have predictable output these are some platform specific extensions a limitation of the ms c runtime library is that it crashes if a date before 1900 is passed with a format string containing y issue 13674 19634
import calendar
import sys
import re
from test import support
import time
import unittest



def fixasctime(s):
    if s[8] == ' ':
        s = s[:8] + '0' + s[9:]
    return s

def escapestr(text, ampm):
    
    new_text = re.escape(text)
    new_text = new_text.replace(re.escape(ampm), ampm)
    new_text = new_text.replace(r'\%', '%')
    new_text = new_text.replace(r'\:', ':')
    new_text = new_text.replace(r'\?', '?')
    return new_text


class StrftimeTest(unittest.TestCase):

    def _update_variables(self, now):
        
        self.gmt = time.gmtime(now)
        now = time.localtime(now)

        if now[3] < 12: self.ampm='(AM|am)'
        else: self.ampm='(PM|pm)'

        self.jan1 = time.localtime(time.mktime((now[0], 1, 1, 0, 0, 0, 0, 1, 0)))

        try:
            if now[8]: self.tz = time.tzname[1]
            else: self.tz = time.tzname[0]
        except AttributeError:
            self.tz = ''

        if now[3] > 12: self.clock12 = now[3] - 12
        elif now[3] > 0: self.clock12 = now[3]
        else: self.clock12 = 12

        self.now = now

    def setUp(self):
        from locale import setlocale, LC_TIME
        saved_locale = setlocale(LC_TIME)
        setlocale(LC_TIME, 'C')
        self.addCleanup(setlocale, LC_TIME, saved_locale)

    def test_strftime(self):
        now = time.time()
        self._update_variables(now)
        self.strftest1(now)
        self.strftest2(now)

        if support.verbose:
            print("Strftime test, platform: %s, Python version: %s" % \
                  (sys.platform, sys.version.split()[0]))

        for j in range(-5, 5):
            for i in range(25):
                arg = now + (i+j*100)*23*3603
                self._update_variables(arg)
                self.strftest1(arg)
                self.strftest2(arg)

    def strftest1(self, now):
        if support.verbose:
            print("strftime test for", time.ctime(now))
        now = self.now
        
        
        expectations = (
            ('%a', calendar.day_abbr[now[6]], 'abbreviated weekday name'),
            ('%A', calendar.day_name[now[6]], 'full weekday name'),
            ('%b', calendar.month_abbr[now[1]], 'abbreviated month name'),
            ('%B', calendar.month_name[now[1]], 'full month name'),
            
            ('%d', '%02d' % now[2], 'day of month as number (00-31)'),
            ('%H', '%02d' % now[3], 'hour (00-23)'),
            ('%I', '%02d' % self.clock12, 'hour (01-12)'),
            ('%j', '%03d' % now[7], 'julian day (001-366)'),
            ('%m', '%02d' % now[1], 'month as number (01-12)'),
            ('%M', '%02d' % now[4], 'minute, (00-59)'),
            ('%p', self.ampm, 'AM or PM as appropriate'),
            ('%S', '%02d' % now[5], 'seconds of current time (00-60)'),
            ('%U', '%02d' % ((now[7] + self.jan1[6])//7),
             'week number of the year (Sun 1st)'),
            ('%w', '0?%d' % ((1+now[6]) % 7), 'weekday as a number (Sun 1st)'),
            ('%W', '%02d' % ((now[7] + (self.jan1[6] - 1)%7)//7),
            'week number of the year (Mon 1st)'),
            
            ('%X', '%02d:%02d:%02d' % (now[3], now[4], now[5]), '%H:%M:%S'),
            ('%y', '%02d' % (now[0]%100), 'year without century'),
            ('%Y', '%d' % now[0], 'year with century'),
            
            ('%%', '%', 'single percent sign'),
        )

        for e in expectations:
            
            try:
                result = time.strftime(e[0], now)
            except ValueError as error:
                self.fail("strftime '%s' format gave error: %s" % (e[0], error))
            if re.match(escapestr(e[1], self.ampm), result):
                continue
            if not result or result[0] == '%':
                self.fail("strftime does not support standard '%s' format (%s)"
                          % (e[0], e[2]))
            else:
                self.fail("Conflict for %s (%s): expected %s, but got %s"
                          % (e[0], e[2], e[1], result))

    def strftest2(self, now):
        nowsecs = str(int(now))[:-1]
        now = self.now

        nonstandard_expectations = (
        
            ('%c', fixasctime(time.asctime(now)), 'near-asctime() format'),
            ('%x', '%02d/%02d/%02d' % (now[1], now[2], (now[0]%100)),
            '%m/%d/%y %H:%M:%S'),
            ('%Z', '%s' % self.tz, 'time zone name'),

            
            ('%D', '%02d/%02d/%02d' % (now[1], now[2], (now[0]%100)), 'mm/dd/yy'),
            ('%e', '%2d' % now[2], 'day of month as number, blank padded ( 0-31)'),
            ('%h', calendar.month_abbr[now[1]], 'abbreviated month name'),
            ('%k', '%2d' % now[3], 'hour, blank padded ( 0-23)'),
            ('%n', '\n', 'newline character'),
            ('%r', '%02d:%02d:%02d %s' % (self.clock12, now[4], now[5], self.ampm),
            '%I:%M:%S %p'),
            ('%R', '%02d:%02d' % (now[3], now[4]), '%H:%M'),
            ('%s', nowsecs, 'seconds since the Epoch in UCT'),
            ('%t', '\t', 'tab character'),
            ('%T', '%02d:%02d:%02d' % (now[3], now[4], now[5]), '%H:%M:%S'),
            ('%3y', '%03d' % (now[0]%100),
            'year without century rendered using fieldwidth'),
        )


        for e in nonstandard_expectations:
            try:
                result = time.strftime(e[0], now)
            except ValueError as result:
                msg = "Error for nonstandard '%s' format (%s): %s" % \
                      (e[0], e[2], str(result))
                if support.verbose:
                    print(msg)
                continue
            if re.match(escapestr(e[1], self.ampm), result):
                if support.verbose:
                    print("Supports nonstandard '%s' format (%s)" % (e[0], e[2]))
            elif not result or result[0] == '%':
                if support.verbose:
                    print("Does not appear to support '%s' format (%s)" % \
                           (e[0], e[2]))
            else:
                if support.verbose:
                    print("Conflict for nonstandard '%s' format (%s):" % \
                           (e[0], e[2]))
                    print("  Expected %s, but got %s" % (e[1], result))


class Y1900Tests(unittest.TestCase):
    

    def test_y_before_1900(self):
        
        t = (1899, 1, 1, 0, 0, 0, 0, 0, 0)
        if (sys.platform == "win32"
        or sys.platform.startswith(("aix", "sunos", "solaris"))):
            with self.assertRaises(ValueError):
                time.strftime("%y", t)
        else:
            self.assertEqual(time.strftime("%y", t), "99")

    def test_y_1900(self):
        self.assertEqual(
            time.strftime("%y", (1900, 1, 1, 0, 0, 0, 0, 0, 0)), "00")

    def test_y_after_1900(self):
        self.assertEqual(
            time.strftime("%y", (2013, 1, 1, 0, 0, 0, 0, 0, 0)), "13")

if __name__ == '__main__':
    unittest.main()