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-rw-r--r--doc/lua-filters.md11
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index 4411e90a5..7c0e83ee8 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -1433,6 +1433,17 @@ Lua functions for pandoc scripts.
This module exposes internal pandoc functions and utility
functions.
+[`normalize_date (date_string)`]{#utils-normalize_date}
+
+: Parse a date and convert (if possible) to "YYYY-MM-DD"
+ format. We limit years to the range 1601-9999 (ISO 8601
+ accepts greater than or equal to 1583, but MS Word only
+ accepts dates starting 1601).
+
+ Returns:
+
+ - A date string, or nil when the conversion failed.
+
[`sha1 (contents)`]{#utils-sha1}
: Returns the SHA1 has of the contents.