diff --git a/icu4c/source/i18n/tzdat.h b/icu4c/source/i18n/tzdat.h
new file mode 100644
index 0000000000..01fd4b0c95
--- /dev/null
+++ b/icu4c/source/i18n/tzdat.h
@@ -0,0 +1,52 @@
+/*
+**********************************************************************
+*   Copyright (C) 1999, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*   Date        Name        Description
+*   11/24/99    aliu        Creation.
+**********************************************************************
+*/
+
+#ifndef TZDAT_H
+#define TZDAT_H
+
+#include "utypes.h"
+
+/* This file defines the format of the memory-mapped data file
+ * containing system time zone data for icu.  See also gentz
+ * and tz.pl.
+ */
+
+struct TZHeader {    
+    uint16_t versionYear;     // e.g. "1999j" -> 1999
+    uint16_t versionSuffix;   // e.g. "1999j" -> 10
+    uint32_t standardCount;   // # of standard rules     
+    uint32_t standardOffset;  // offset to standard rules
+    uint32_t dstCount;        // # of dst rules          
+    uint32_t dstOffset;       // offset to dst rules     
+    uint32_t nameTableOffset; // offset to name table    
+};
+
+struct StandardZone {
+    uint32_t nameOffset;  // offset *within name table* to name
+    int32_t  gmtOffset;   // gmtoffset in seconds
+};
+
+struct TZRule {
+    uint8_t  month;  // month
+    int8_t   dowim;  // dowim
+    int8_t   dow;    // dow
+    uint16_t time;   // time minutes
+    int8_t   mode;   // mode ('w', 's', 'u')
+};
+
+struct DSTZone {
+    uint32_t nameOffset;  // offset within name table to name
+    int32_t  gmtOffset;   // gmtoffset in seconds
+    uint16_t dstSavings;  // savings in minutes
+    TZRule   onsetRule;   // onset rule
+    TZRule   ceaseRule;   // cease rule
+};
+
+#endif