Days to expiration (DTE)

DTE means days to expiration: the time remaining before a particular option expires. Under a calendar-day convention, subtract today’s date from the expiration date. The expiration date is 0DTE; the preceding calendar date is 1DTE. A displayed integer is a shorthand, not a precise measure of trading hours left.

For a hypothetical Friday expiration, Thursday is 1DTE and Friday is 0DTE. On the preceding Monday it is 4DTE. A contract expiring the following Monday is 3DTE on Friday using calendar days, even though Monday is the next trading session. Weekends and holidays make “one day” and “one trading session” different ideas.

Platforms and analytical tools may count calendar days, trading days or fractional days differently. Check the platform’s definition and time zone; for a pricing model, confirm its time convention rather than blindly entering a displayed DTE number.

How to read expiration dates in an option chain

  1. Select the underlying and confirm whether it is a stock, ETF, cash index or futures product.
  2. Open the expiration selector. Read the complete date, including year; compare monthly, weekly and any other listed series.
  3. Check the displayed DTE against that date. Do not assume the nearest date is today or tomorrow.
  4. Select call or put and strike, then check bid, ask, quote timestamp, volume and open interest for that exact contract.
  5. Open contract details for the symbol/root, multiplier, deliverable, exercise style, settlement method and last trading time.
  6. For a spread, verify the expiration and contract specifications of every leg before reviewing the order.

Example only: a chain viewed on Thursday might show Friday (1DTE), the following Monday (4DTE) and a later monthly date. That is an illustration of reading a chain, not a claim that all three expirations exist for every underlying.

Expiration is not always the last trading time

A date label alone cannot tell you how long you have to close a position. An AM-settled series may stop trading before its expiration date. Broker deadlines and exchange holiday hours also matter. See the exact SPX series terms for an example of why settlement timing must be checked separately.

DTE decreases as the contract ages, but it does not measure liquidity, the probability of profit or the maximum loss. Continue with 0DTE, 1DTE and weekly options.

Sources and further reading

Reviewed 18 September 2026. Contract availability and terms can change; verify the selected series with the exchange and broker. Examples are hypothetical and exclude trading costs. Editorial standards.