Time 0 is loaded incorrectly

Created originally on Bitbucket by YuriS

Date with internal value 0 is loaded as datetime(1899, 12, 30, 0, 0), which actually corresponds to -1.

#!python
import datetime
import openpyxl

wb = openpyxl.Workbook()
ws = wb.create_sheet('test')
ws['A1'] = datetime.time(0, 0)
wb.save('time-test.xlsx')

wb = openpyxl.load_workbook('time-test.xlsx')
ws = wb.get_sheet_by_name('test')
print ws['A1'].internal_value, ws['A1'].value

The results is 0 1899-12-30 00:00:00.

I believe it should rather be time(0, 0) and the following lines in openpyxl.utils.datetime.from_excel

if 1 < value < 60 and offset == CALENDAR_WINDOWS_1900:

if 0 < abs(value) < 1:

should be changed to

if 1 <= value < 60 and offset == CALENDAR_WINDOWS_1900:

if 0 <= abs(value) < 1: