/**
 * getDateStringFromDay - converts the day which is days since 01/01/1970 to time string of format dd.mm.yyCC
 * @param day day since 01/01/1970
 * @return the date string of format dd.mm.yyCC
 */
rstring getDateStringFromDay(uint32 day) {
	timestamp ts = createTimestamp((int64) day * 24l*60l*60l, 0u);
	mutable Sys.tm tm = {sec=0, min=0, hour=0, mday=0, mon=0, year=0, wday=0,
						 yday=0, isdst=0, gmtoff=0, zone=""};

	time(ts, "UTC", tm);
	return(strftime(tm, "%d.%m.%C%y"));
}

/**
 * callReferenceTimeToTimestamp - converts the time string to timestamp
 * @param callReferenceTime input time in format YYCC-MM-DD hh:mm:ss
 * @return the timestamp
 */
timestamp callReferenceTimeToTimestamp(rstring callReferenceTime) {
	mutable Sys.tm tm = {sec=0, min=0, hour=0, mday=0, mon=0, year=0, wday=0, yday=0, isdst=0, gmtoff=0, zone=""};
	mutable uint32 numCharsProcessed = 0u;
	strptime(callReferenceTime, "%C%y-%m-%d %H:%M:%S", tm, numCharsProcessed);
	return toTimestamp(tm);
}