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diff --git a/src/xtime.h b/src/xtime.h
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+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2020-2022 Tavian Barnes <tavianator@tavianator.com>        *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+/**
+ * Date/time handling.
+ */
+
+#ifndef BFS_XTIME_H
+#define BFS_XTIME_H
+
+#include <time.h>
+
+/**
+ * localtime_r() wrapper that calls tzset() first.
+ *
+ * @param[in] timep
+ *         The time_t to convert.
+ * @param[out] result
+ *         Buffer to hold the result.
+ * @return
+ *         0 on success, -1 on failure.
+ */
+int xlocaltime(const time_t *timep, struct tm *result);
+
+/**
+ * gmtime_r() wrapper that calls tzset() first.
+ *
+ * @param[in] timep
+ *         The time_t to convert.
+ * @param[out] result
+ *         Buffer to hold the result.
+ * @return
+ *         0 on success, -1 on failure.
+ */
+int xgmtime(const time_t *timep, struct tm *result);
+
+/**
+ * mktime() wrapper that reports errors more reliably.
+ *
+ * @param[in,out] tm
+ *         The struct tm to convert.
+ * @param[out] timep
+ *         A pointer to the result.
+ * @return
+ *         0 on success, -1 on failure.
+ */
+int xmktime(struct tm *tm, time_t *timep);
+
+/**
+ * A portable timegm(), the inverse of gmtime().
+ *
+ * @param[in,out] tm
+ *         The struct tm to convert.
+ * @param[out] timep
+ *         A pointer to the result.
+ * @return
+ *         0 on success, -1 on failure.
+ */
+int xtimegm(struct tm *tm, time_t *timep);
+
+/**
+ * Parse an ISO 8601-style timestamp.
+ *
+ * @param[in] str
+ *         The string to parse.
+ * @param[out] result
+ *         A pointer to the result.
+ * @return
+ *         0 on success, -1 on failure.
+ */
+int parse_timestamp(const char *str, struct timespec *result);
+
+#endif // BFS_XTIME_H