def xldate_from_date_tuple(date, datemode):
year, month, day = date
if datemode not in (0, 1):
raise XLDateBadDatemode(datemode)
if year == 0 and month == 0 and day == 0:
return 0.00
if not (1900 <= year <= 9999):
raise XLDateBadTuple("Invalid year: %r" % ((year, month, day),))
if not (1 <= month <= 12):
raise XLDateBadTuple("Invalid month: %r" % ((year, month, day),))
if day < 1 \
or (day > _days_in_month[month] and not(day == 29 and month == 2 and _leap(year))):
raise XLDateBadTuple("Invalid day: %r" % ((year, month, day),))
Yp = year + 4716
M = month
if M <= 2:
Yp = Yp - 1
Mp = M + 9
else:
Mp = M - 3
jdn = ifd(1461 * Yp, 4) + ifd(979 * Mp + 16, 32) + \
day - 1364 - ifd(ifd(Yp + 184, 100) * 3, 4)
xldays = jdn - _JDN_delta[datemode]
if xldays <= 0:
raise XLDateBadTuple("Invalid (year, month, day): %r" % ((year, month, day),))
if xldays < 61 and datemode == 0:
raise XLDateAmbiguous("Before 1900-03-01: %r" % ((year, month, day),))
return float(xldays)
def xldate_as_tuple(xldate, datemode):
if datemode not in (0, 1):
raise XLDateBadDatemode(datemode)
if xldate == 0.00:
return (0, 0, 0, 0, 0, 0)
if xldate < 0.00:
raise XLDateNegative(xldate)
xldays = int(xldate)
frac = xldate - xldays
seconds = int(round(frac * 86400.0))
assert 0 <= seconds <= 86400
if seconds == 86400:
hour = minute = second = 0
xldays += 1
else:
# second = seconds % 60; minutes = seconds // 60
minutes, second = divmod(seconds, 60)
# minute = minutes % 60; hour = minutes // 60
hour, minute = divmod(minutes, 60)
if xldays >= _XLDAYS_TOO_LARGE[datemode]:
raise XLDateTooLarge(xldate)
if xldays == 0:
return (0, 0, 0, hour, minute, second)
if xldays < 61 and datemode == 0:
raise XLDateAmbiguous(xldate)
jdn = xldays + _JDN_delta[datemode]
yreg = (ifd(ifd(jdn * 4 + 274277, 146097) * 3, 4) + jdn + 1363) * 4 + 3
mp = ifd(yreg % 1461, 4) * 535 + 333
d = ifd(mp % 16384, 535) + 1
# mp /= 16384
mp >>= 14
if mp >= 10:
return (ifd(yreg, 1461) - 4715, mp - 9, d, hour, minute, second)
else:
return (ifd(yreg, 1461) - 4716, mp + 3, d, hour, minute, second)
