--- /dev/null
+import datetime
+import re
+
+_strf = "%Y%m%d%H%M%S%f"
+_reabs = re.compile("^\d{20}$")
+_rerel = re.compile("^(?P<time>\d+(.\d+)?)(?P<units>h|m|s|ms|us)$")
+
+# Work around to fix "ImportError: Failed to import _strptime because the import lock is held by another thread."
+datetime.datetime.strptime("20120807124732894211", _strf)
+
+def strfnow():
+ """ Current date """
+ return datetime.datetime.now().strftime(_strf)
+
+def strfdiff(str1, str2):
+ # Time difference in seconds without ignoring miliseconds
+ d1 = datetime.datetime.strptime(str1, _strf)
+ d2 = datetime.datetime.strptime(str2, _strf)
+ diff = d1 - d2
+ ddays = diff.days * 86400
+ dus = round(diff.microseconds * 1.0e-06, 2)
+ ret = ddays + diff.seconds + dus
+ # delay must be > 0
+ return (ret or 0.001)
+
+def strfvalid(date):
+ """ User defined date to scheduler date
+
+ :param date : user define date matchin the pattern _strf
+ :type date : date
+
+ """
+ if not date:
+ return strfnow()
+ if _reabs.match(date):
+ return date
+ m = _rerel.match(date)
+ if m:
+ time = float(m.groupdict()['time'])
+ units = m.groupdict()['units']
+ if units == 'h':
+ delta = datetime.timedelta(hours = time)
+ elif units == 'm':
+ delta = datetime.timedelta(minutes = time)
+ elif units == 's':
+ delta = datetime.timedelta(seconds = time)
+ elif units == 'ms':
+ delta = datetime.timedelta(microseconds = (time*1000))
+ else:
+ delta = datetime.timedelta(microseconds = time)
+ now = datetime.datetime.now()
+ d = now + delta
+ return d.strftime(_strf)
+ return None
+