review uses of strftime to use a common central date format sfatime.SFATIME_FORMAT

[sfa.git] / sfa / util / sfatime.py

diff --git a/sfa/util/sfatime.py b/sfa/util/sfatime.py
index 4879689..d14f44b 100644 (file)
--- a/sfa/util/sfatime.py
+++ b/sfa/util/sfatime.py
@@ -27,7 +27,7 @@ import time
 
 from sfa.util.sfalogging import logger
 
-DATEFORMAT = "%Y-%m-%dT%H:%M:%SZ"
+SFATIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
 
 def utcparse(input):
     """ Translate a string into a time using dateutil.parser.parse but make sure it's in UTC time and strip
@@ -57,10 +57,17 @@ For safety this can also handle inputs that are either timestamps, or datetimes
         logger.error("Unexpected type in utcparse [%s]"%type(input))
 
 def datetime_to_string(input):
-    return datetime.datetime.strftime(input, DATEFORMAT)
+    return datetime.datetime.strftime(input, SFATIME_FORMAT)
 
 def datetime_to_utc(input):
     return time.gmtime(datetime_to_epoch(input))
 
 def datetime_to_epoch(input):
     return int(time.mktime(input.timetuple()))
+
+def adjust_datetime(input, days=0, hours=0, minutes=0, seconds=0):
+    """
+    Adjust the input date by the specified delta (in seconds).
+    """
+    dt = utcparse(input)
+    return dt + datetime.timedelta(days=days, hours=hours, minutes=minutes, seconds=seconds)