time: Added the functions mktime localtime and gmtime

time/example_time_tuple.py

@@ -0,0 +1,10 @@
+import time
+
+ts = 0
+for i in range(0, 31):
+    ts += 1 << i
+    ltt = time.localtime(ts)
+    gtt = time.gmtime(ts)
+    print("ts: ", ts, " local: ", tuple(ltt), " utc: ", tuple(gtt))
+    lts = time.mktime(ltt)
+    assert ts == lts

time/time.py

@@ -1,4 +1,6 @@
 from utime import *
+import ustruct
+import uctypes
 import ffi
 import ffilib
 import array
@@ -12,6 +14,16 @@ libc = ffilib.libc()
 gmtime_ = libc.func("P", "gmtime", "P")
 localtime_ = libc.func("P", "localtime", "P")
 strftime_ = libc.func("i", "strftime", "sisP")
+mktime_ = libc.func("i", "mktime", "P")
+
+
+def _tuple_to_c_tm(t):
+    return ustruct.pack("@iiiiiiiii", t[5], t[4], t[3], t[2], t[1] - 1, t[0] - 1900, (t[6] + 1) % 7, t[7] - 1, t[8])
+
+
+def _c_tm_to_tuple(tm):
+    t = ustruct.unpack("@iiiiiiiii", tm)
+    return tuple([t[5] + 1900, t[4] + 1, t[3], t[2], t[1], t[0], (t[6] - 1) % 7, t[7] + 1, t[8]])
 
 
 def strftime(format, t=None):
@@ -25,6 +37,31 @@ def strftime(format, t=None):
     l = strftime_(buf, 32, format, tm_p)
     return str(buf[:l], "utf-8")
 
+
+def localtime(t=None):
+    if t is None:
+        t = time()
+
+    t = int(t)
+    a = ustruct.pack('i', t)
+    tm_p = localtime_(a)
+    return _c_tm_to_tuple(uctypes.bytearray_at(tm_p, 36))
+
+
+def gmtime(t=None):
+    if t is None:
+        t = time()
+
+    t = int(t)
+    a = ustruct.pack('i', t)
+    tm_p = gmtime_(a)
+    return _c_tm_to_tuple(uctypes.bytearray_at(tm_p, 36))
+
+
+def mktime(tt):
+    return mktime_(_tuple_to_c_tm(tt))
+
+
 def perf_counter():
     return time()