The number of days left until the contract expires. Sometimes mislabeled as 68DTE · 42d · 0d; the platform's term is DTE.
What this counter is
Days to Expiration (DTE · Days To Expiration) is a contract's age counter: how many days are left before it expires. This small number reshapes every property of the contract. A 45-day contract and a 2-day contract are different animals even if everything else matches.
How it changes everything
As the counter falls, time decay speeds up (the cliff of the last days), the gamma gets sharper (delta swings hard with every move), and vega weakens (Implied Volatility loses its hold). A long contract is a patient bet on direction, and a short one is an explosive bet on timing.
The language of the craft
Traders talk in it: "I sold at 45 days and close at 21." It is a well-known rule in premium selling schools (harvest the fattest slices of decay and leave before the gamma danger zone). And "zero-day contracts" (0DTE) are a world of their own that lives and dies in one session. The counter is the center of every strategy's design.
Hypothetical example
A condor seller opens at 45 days. He earns two thirds of his maximum profit in the first half of the period, so he closes at 21 days. He gives up the last third on purpose, since it comes with the sharpest gamma and the riskiest surprises. His colleague who "waits for the last cent" gives back a month of gains in one volatile day.
Common mistake
Buying short counters for slow ideas. An idea that needs two months, held in a two-week contract, dies even if it was right. Pick the counter from the idea's time limit multiplied by a safety margin, not from how cheap the premium is.
The 45 ⇐ 21 textbook rule
Premium sellers open at about 45 days and close at 21. They collect the fattest slices of decay and leave before the sharp gamma zone, where delta swings hard and surprises happen. The last third of the profit is left on purpose because it costs the most risk in the position's life.
Where to see it on the platform
The options chain shows it for every expiration, and the calculator computes its effect on theta and gamma for your specific contract.
The options chain shows it for every expiration, and the calculator computes its effect on theta and gamma for your specific contract.
