Year-to-date (YTD) is a period of time that is based on the beginning of the calendar year and up to the current date.
Year-to-date is a metric that describes the return so far this year.
YTD is used primarily in financial statements that detail the performance of a business entity. For example: you can have numbers showing YTD revenue for your app or YTD total customers for your app.
These metrics can help you compare a similar period in previous years.