Dates & times
Natural dates, countdowns, durations, and clock math.
Write dates the way you say them: 10 june, next friday, today, 3 days ago. Spanish works too: hoy, mañana, próximo viernes. Add or subtract durations to move through the calendar.
The gap between two dates
Subtract dates, or write "A to B", and you get a calendar-aware duration. Ask for a specific unit with "in days" or "in weeks" and the answer uses real calendar days, not 30-day months.
Countdowns
"days until" counts whole days from today. "days since" looks backwards, and a date without a year means the most recent one that already happened.
Clock math and durations
Times work like you would hope, and multi-part durations like 14 hours 30 min are understood as one thing. A duration stored in a variable works in both worlds: date math and unit conversions. To pin a time to a city and convert it across the world, see Timezones.
Workdays
workdays means Monday to Friday. Add them to hop over weekends, measure a range in them, or ask workdays until a date. Public holidays are not subtracted (that needs to know your country; coming later). weekday on tells you the day of the week for any date.
Timestamps and ISO dates
Convert any date to the formats machines use, and back. as timespan breaks a time quantity into readable parts.
What does not become a date
OtterCalc is careful with ambiguity. 5/2 is division, 2020 is a number, and a heading like "March budget" stays text. Dates only take over when the line clearly reads as one.