diff --git a/crates/fidc-core/src/platform_expr_strategy.rs b/crates/fidc-core/src/platform_expr_strategy.rs
index c2c6517..00c72eb 100644
--- a/crates/fidc-core/src/platform_expr_strategy.rs
+++ b/crates/fidc-core/src/platform_expr_strategy.rs
@@ -126,8 +126,13 @@ struct DayExpressionState {
     refresh_rate: i64,
     year: i64,
     month: i64,
+    quarter: i64,
     day_of_month: i64,
+    day_of_year: i64,
+    week_of_year: i64,
     weekday: i64,
+    is_month_start: bool,
+    is_month_end: bool,
 }
 
 #[derive(Debug, Clone)]
@@ -574,6 +579,8 @@ impl PlatformExprStrategy {
         let market_value = ctx.portfolio.positions().values().map(|position| position.market_value()).sum::<f64>();
         let total_equity = cash + market_value;
         let current_exposure = if total_equity > 0.0 { market_value / total_equity } else { 0.0 };
+        let next_day = date + Duration::days(1);
+        let is_month_end = next_day.month() != date.month();
 
         Ok(DayExpressionState {
             signal_close,
@@ -595,8 +602,13 @@ impl PlatformExprStrategy {
             refresh_rate: self.config.refresh_rate as i64,
             year: date.year() as i64,
             month: date.month() as i64,
+            quarter: ((date.month0() / 3) + 1) as i64,
             day_of_month: date.day() as i64,
+            day_of_year: date.ordinal() as i64,
+            week_of_year: date.iso_week().week() as i64,
             weekday: date.weekday().number_from_monday() as i64,
+            is_month_start: date.day() == 1,
+            is_month_end,
         })
     }
 
@@ -694,8 +706,13 @@ impl PlatformExprStrategy {
         scope.push("refresh_rate", day.refresh_rate);
         scope.push("year", day.year);
         scope.push("month", day.month);
+        scope.push("quarter", day.quarter);
         scope.push("day_of_month", day.day_of_month);
+        scope.push("day_of_year", day.day_of_year);
+        scope.push("week_of_year", day.week_of_year);
         scope.push("weekday", day.weekday);
+        scope.push("is_month_start", day.is_month_start);
+        scope.push("is_month_end", day.is_month_end);
         if let Some(stock) = stock {
             scope.push("symbol", stock.symbol.clone());
             scope.push("market_cap", stock.market_cap);