How many odd days are there from January 291989 to January 181990?

To calculate the number of odd days from January 29, 1989, to January 18, 1990, we first find the total number of days between these two dates. From January 29, 1989, to January 29, 1990, is 1 year, which includes 365 days. However, we only count from January 29, 1989, to January 18, 1990, which is 355 days (11 months and 20 days). Dividing 355 by 7 gives us 50 weeks and 5 odd days. Therefore, there are 5 odd days in this period.