1 files changed, 74 insertions, 0 deletions
diff --git a/date.h b/date.h
new file mode 100644
index 0000000000..5d4eaba0a9
--- /dev/null
+++ b/date.h
@@ -0,0 +1,74 @@
+#ifndef DATE_H
+#define DATE_H
+
+/**
+ * The date mode type. This has DATE_NORMAL at an explicit "= 0" to
+ * accommodate a memset([...], 0, [...]) initialization when "struct
+ * date_mode" is used as an embedded struct member, as in the case of
+ * e.g. "struct pretty_print_context" and "struct rev_info".
+ */
+enum date_mode_type {
+	DATE_NORMAL = 0,
+	DATE_HUMAN,
+	DATE_RELATIVE,
+	DATE_SHORT,
+	DATE_ISO8601,
+	DATE_ISO8601_STRICT,
+	DATE_RFC2822,
+	DATE_STRFTIME,
+	DATE_RAW,
+	DATE_UNIX
+};
+
+struct date_mode {
+	enum date_mode_type type;
+	const char *strftime_fmt;
+	int local;
+};
+
+#define DATE_MODE_INIT { \
+	.type = DATE_NORMAL, \
+}
+
+/**
+ * Convenience helper for passing a constant type, like:
+ *
+ *   show_date(t, tz, DATE_MODE(NORMAL));
+ */
+#define DATE_MODE(t) date_mode_from_type(DATE_##t)
+struct date_mode *date_mode_from_type(enum date_mode_type type);
+
+/**
+ * Format <'time', 'timezone'> into static memory according to 'mode'
+ * and return it. The mode is an initialized "struct date_mode"
+ * (usually from the DATE_MODE() macro).
+ */
+const char *show_date(timestamp_t time, int timezone, const struct date_mode *mode);
+
+/**
+ * Parse a date format for later use with show_date().
+ *
+ * When the "date_mode_type" is DATE_STRFTIME the "strftime_fmt"
+ * member of "struct date_mode" will be a malloc()'d format string to
+ * be used with strbuf_addftime(), in which case you'll need to call
+ * date_mode_release() later.
+ */
+void parse_date_format(const char *format, struct date_mode *mode);
+
+/**
+ * Release a "struct date_mode", currently only required if
+ * parse_date_format() has parsed a "DATE_STRFTIME" format.
+ */
+void date_mode_release(struct date_mode *mode);
+
+void show_date_relative(timestamp_t time, struct strbuf *timebuf);
+int parse_date(const char *date, struct strbuf *out);
+int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset);
+int parse_expiry_date(const char *date, timestamp_t *timestamp);
+void datestamp(struct strbuf *out);
+#define approxidate(s) approxidate_careful((s), NULL)
+timestamp_t approxidate_careful(const char *, int *);
+timestamp_t approxidate_relative(const char *date);
+int date_overflows(timestamp_t date);
+time_t tm_to_time_t(const struct tm *tm);
+#endif