1 files changed, 14 insertions, 0 deletions
diff --git a/zen/time.h b/zen/time.h
index b3b903b6..9b5f670e 100644
--- a/zen/time.h
+++ b/zen/time.h
@@ -159,11 +159,23 @@ TimeComp getUtcTime2(time_t utc)
 {
     //1. convert: seconds since year 1:
     //...
+    //assert(time_t is signed)
 
     //TODO: what if < 0?
     long long remDays = utc / (24 * 3600);
     long long remSecs = utc % (24 * 3600);
 
+    //days per year
+    const int dpYearStd  = 365;
+    const int dpYearLeap = dpYearStd + 1;
+    const int dp4Years = 3 * dpYearStd + dpYearLeap;
+    const int dp100YearsStd = 25 * dp4Years - 1; //no leap days for centuries...
+    const int dp100YearsExc = 25 * dp4Years; //...except if divisible by 400
+    const int dp400Years = 3 * dp100YearsStd + dp100YearsExc;
+
+
+
+
     const int daysPer4Years = 4 * 365 /*usual days per year*/ + 1 /*including leap day*/;
     const int daysPerYear = 365; //non-leap
     const int daysPer100Years = 25 * daysPer4Years - 1;
@@ -197,6 +209,8 @@ TimeComp getUtcTime2(time_t utc)
 
 
 
+    const char daysPerMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
 
 
     //first four years of century: