From d900ed2d2cc9a8ebf460c52e818ae720f9ed4952 Mon Sep 17 00:00:00 2001 From: wtty-fool Date: Sat, 21 Apr 2018 20:16:24 +0200 Subject: [PATCH] Added conversion to and from Mayan Long Count --- src/maya/core.py | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/src/maya/core.py b/src/maya/core.py index 62ef276..f32cf75 100644 --- a/src/maya/core.py +++ b/src/maya/core.py @@ -212,6 +212,16 @@ def from_iso8601(klass, iso8601_string): """Returns MayaDT instance from iso8601 string.""" return parse(iso8601_string) + @classmethod + def from_long_count(klass, long_count_string): + """Returns MayaDT instance from Maya Long Count string.""" + days_since_creation = -1856305 + factors = (144000, 7200, 360, 20, 1) + for i, value in enumerate(long_count_string.split('.')): + days_since_creation += int(value) * factors[i] + days_since_creation *= 3600 * 24 + return klass(epoch=days_since_creation) + @staticmethod def from_rfc2822(rfc2822_string): """Returns MayaDT instance from rfc2822 string.""" @@ -269,6 +279,22 @@ def rfc3339(self): """Returns an RFC 3339 representation of the MayaDT.""" return self.datetime().strftime("%Y-%m-%dT%H:%M:%S.%f")[:-5] + "Z" + def long_count(self): + """Returns a Mayan Long Count representation of the Maya DT.""" + # Creation (0.0.0.0.0) occurred on -3114-08-11 + # 1856305 is distance (in days) between Creation and UNIX epoch + days_since_creation = int(1856305 + self._epoch / (3600*24)) + caps = (0, 20, 20, 18, 20) + lc_date = [0, 0, 0, 0, days_since_creation] + for i in range(4, 0, -1): + if lc_date[i] >= caps[i]: + lc_date[i-1] += int(lc_date[i]/caps[i]) + lc_date[i] %= caps[i] + elif lc_date[i] < 0: + lc_date[i-1] += int(lc_date[i]/caps[i]) + lc_date[i] = 0 + return '.'.join(str(i) for i in lc_date) + # Properties # ---------- @property