filled out Command.parseTimeSpec()

Command.py

@@ -1,5 +1,6 @@
 
-from datetime import datetime
+from datetime import datetime, timedelta
+import re
 
 class Command:
     def __init__(self, timenow, cmdline):
@@ -33,4 +34,34 @@ class Command:
             self.argstr = ' '.join([command, rest]).strip()
 
     def parseTimeSpec(self, timespec):
-        pass
+        the_time = self.time
+        m = re.match('^(?:(\d{4})[-/])?(\d{1,2})[-/](\d{1,2}),(.*)$', timespec)
+        if m is not None:
+            # a date was given
+            if m.group(1) != '':
+                the_time = the_time.replace(year = m.group(1))
+            the_time = the_time.replace(month = m.group(2), day = m.group(3))
+            timespec = m.group(4)
+        m = re.match('^(\d{1,2}):?(\d{2})?(am?|pm?)?$', timespec, re.I)
+        if m is not None:
+            # an absolute time was given
+            h = int(m.group(1))
+            mins = 0 if m.group(2) is None else int(m.group(2))
+            am_pm = m.group(3).lower()
+            if len(am_pm) >= 1 and am_pm[0] == 'p' and h < 12:
+                h += 12
+            elif len(am_pm) >= 1 and am_pm[0] == 'a' and h == 12:
+                h = 0
+            the_time = the_time.replace(hour = h, minute = mins, second = 0)
+        else:
+            m = re.match('^([-+])(\d+(?:\.\d+)?)([hms])?$', timespec, re.I)
+            if m is not None:
+                # a relative time was given
+                plus_minus = m.group(1)
+                hms = m.group(3)
+                if hms == 'm':
+                    seconds = m.group(2) * 60
+                elif hms == 's':
+                    seconds = m.group(2)
+                else:                               # hours
+                    seconds = m.group(2) * 60 * 60