Choose your starting date and enter the number of days to subtract. Enable "Include time" to also subtract hours, minutes, and seconds. The calculator determines the past date instantly, ideal for backdating documents, calculating notice periods, or working backwards from deadlines.

The calculator handles calendar complexities automatically, including leap years and varying month lengths. Enter days (and optionally time) and get the exact past date instantly, accounting for all months and weeks in between.

Results display the past date prominently. Use "Business days only" to subtract working days, excluding weekends and public holidays. Crucial for accurate project start dates and backdating contracts. Share using the export feature.