{"slug":"options-expiration-day-clock-beijing-time","qid":"time_value_decay","label":"time_value_decay","post_title":"options-expiration-day-clock-beijing-time","post_url":"/blog/lang/zh-hans/options-expiration-day-clock-beijing-time#q-time_value_decay","columns":["dte_bucket","time_value_usd","sample_size"],"rows":[{"dte_bucket":"剩 7 天","time_value_usd":5.03,"sample_size":971},{"dte_bucket":"剩 6 天","time_value_usd":4.54,"sample_size":786},{"dte_bucket":"剩 5 天","time_value_usd":3.86,"sample_size":590},{"dte_bucket":"剩 4 天","time_value_usd":3.46,"sample_size":556},{"dte_bucket":"剩 3 天","time_value_usd":3.2,"sample_size":556},{"dte_bucket":"剩 2 天","time_value_usd":2.91,"sample_size":591},{"dte_bucket":"剩 1 天","time_value_usd":2.01,"sample_size":793}],"shape":"ranking","sql":"SELECT\n    concat('剩 ', toString(days_to_expiry), ' 天')                AS dte_bucket,\n    round(avg(toFloat64(option_close) - if(option_type = 'call',\n        greatest(toFloat64(underlying_close) - toFloat64(strike_price), 0),\n        greatest(toFloat64(strike_price) - toFloat64(underlying_close), 0))), 2) AS time_value_usd,\n    count()                                                       AS sample_size\nFROM global_markets.options_greeks\nWHERE underlying_symbol = 'SPY'\n  AND date >= '2025-07-01'\n  AND date <  '2026-07-01'\n  AND iv_converged = 1\n  AND volume > 0\n  AND days_to_expiry BETWEEN 1 AND 7\n  AND abs(toFloat64(strike_price) / toFloat64(underlying_close) - 1) < 0.0015\nGROUP BY days_to_expiry\nORDER BY days_to_expiry DESC","computed_at":"2026-09-28T15:47:37.841102+00:00","elapsed":0.003850324}