import datetime
import xlrd

def excelDateFormatter(sh, i, j, sep = "-"):
    if sh.cell(i, j).ctype == 3:
        cell = sh.cell_value(i, j)
        date = datetime.datetime(*xlrd.xldate_as_tuple(cell, 0))
        YMD = ['%Y', '%m', '%d']
        return date.strftime(sep.join(YMD))
    else:
        return ""

def excelTimeFormatter(sh, i, j, sep = ":"):
    if sh.cell(i, j).ctype == 3:
        cell = sh.cell_value(i, j)
        date = xlrd.xldate_as_tuple(cell, 0)
        timeList = []
        for j in range(3,6):
            timeList.append(str(date[j]))
        return sep.join(timeList)
    else:
        return ""