1 files changed, 105 insertions, 0 deletions
diff --git a/shared/timeutils/timeutils.h b/shared/timeutils/timeutils.h
new file mode 100644
index 0000000000..66e2a77f13
--- /dev/null
+++ b/shared/timeutils/timeutils.h
@@ -0,0 +1,105 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ * Copyright (c) 2015 Daniel Campora
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_LIB_TIMEUTILS_TIMEUTILS_H
+#define MICROPY_INCLUDED_LIB_TIMEUTILS_TIMEUTILS_H
+
+// The number of seconds between 1970/1/1 and 2000/1/1 is calculated using:
+// time.mktime((2000,1,1,0,0,0,0,0,0)) - time.mktime((1970,1,1,0,0,0,0,0,0))
+#define TIMEUTILS_SECONDS_1970_TO_2000 (946684800ULL)
+
+typedef struct _timeutils_struct_time_t {
+    uint16_t tm_year;       // i.e. 2014
+    uint8_t tm_mon;         // 1..12
+    uint8_t tm_mday;        // 1..31
+    uint8_t tm_hour;        // 0..23
+    uint8_t tm_min;         // 0..59
+    uint8_t tm_sec;         // 0..59
+    uint8_t tm_wday;        // 0..6  0 = Monday
+    uint16_t tm_yday;       // 1..366
+} timeutils_struct_time_t;
+
+bool timeutils_is_leap_year(mp_uint_t year);
+mp_uint_t timeutils_days_in_month(mp_uint_t year, mp_uint_t month);
+mp_uint_t timeutils_year_day(mp_uint_t year, mp_uint_t month, mp_uint_t date);
+
+void timeutils_seconds_since_2000_to_struct_time(mp_uint_t t,
+    timeutils_struct_time_t *tm);
+
+mp_uint_t timeutils_seconds_since_2000(mp_uint_t year, mp_uint_t month,
+    mp_uint_t date, mp_uint_t hour, mp_uint_t minute, mp_uint_t second);
+
+mp_uint_t timeutils_mktime_2000(mp_uint_t year, mp_int_t month, mp_int_t mday,
+    mp_int_t hours, mp_int_t minutes, mp_int_t seconds);
+
+// Select the Epoch used by the port.
+#if MICROPY_EPOCH_IS_1970
+
+static inline void timeutils_seconds_since_epoch_to_struct_time(uint64_t t, timeutils_struct_time_t *tm) {
+    // TODO this will give incorrect results for dates before 2000/1/1
+    return timeutils_seconds_since_2000_to_struct_time(t - TIMEUTILS_SECONDS_1970_TO_2000, tm);
+}
+
+static inline uint64_t timeutils_mktime(mp_uint_t year, mp_int_t month, mp_int_t mday, mp_int_t hours, mp_int_t minutes, mp_int_t seconds) {
+    return timeutils_mktime_2000(year, month, mday, hours, minutes, seconds) + TIMEUTILS_SECONDS_1970_TO_2000;
+}
+
+static inline uint64_t timeutils_seconds_since_epoch(mp_uint_t year, mp_uint_t month,
+    mp_uint_t date, mp_uint_t hour, mp_uint_t minute, mp_uint_t second) {
+    return timeutils_seconds_since_2000(year, month, date, hour, minute, second) + TIMEUTILS_SECONDS_1970_TO_2000;
+}
+
+static inline mp_uint_t timeutils_seconds_since_epoch_from_nanoseconds_since_1970(uint64_t ns) {
+    return ns / 1000000000ULL;
+}
+
+static inline uint64_t timeutils_nanoseconds_since_epoch_to_nanoseconds_since_1970(uint64_t ns) {
+    return ns;
+}
+
+#else // Epoch is 2000
+
+#define timeutils_seconds_since_epoch_to_struct_time timeutils_seconds_since_2000_to_struct_time
+#define timeutils_seconds_since_epoch timeutils_seconds_since_2000
+#define timeutils_mktime timeutils_mktime_2000
+
+static inline uint64_t timeutils_seconds_since_epoch_to_nanoseconds_since_1970(mp_uint_t s) {
+    return ((uint64_t)s + TIMEUTILS_SECONDS_1970_TO_2000) * 1000000000ULL;
+}
+
+static inline mp_uint_t timeutils_seconds_since_epoch_from_nanoseconds_since_1970(uint64_t ns) {
+    return ns / 1000000000ULL - TIMEUTILS_SECONDS_1970_TO_2000;
+}
+
+static inline int64_t timeutils_nanoseconds_since_epoch_to_nanoseconds_since_1970(int64_t ns) {
+    return ns + TIMEUTILS_SECONDS_1970_TO_2000 * 1000000000ULL;
+}
+
+#endif
+
+int timeutils_calc_weekday(int y, int m, int d);
+
+#endif // MICROPY_INCLUDED_LIB_TIMEUTILS_TIMEUTILS_H