+ operator interpreted as minus

╰ ipython                                                                                                                                                                                                                                                                      
Python 3.6.5 (default, Nov 19 2018, 18:02:26)                                                                                                                                                                                                                                   
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In [1]: import dateparser                                                                                                                                                                                                                                                       
                                                                                                                                                                                                                                                                                
In [2]: dateparser.parse("now")                                                                                                                                                                                                                                                 
Out[2]: datetime.datetime(2019, 5, 15, 17, 15, 29, 500448)                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                
In [3]: dateparser.parse("now + 1hr")                                                                                                                                                                                                                                           
Out[3]: datetime.datetime(2019, 5, 15, 16, 15, 33, 317451)                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                
In [4]: dateparser.parse("now - 1hr")                                                                                                                                                                                                                                           
Out[4]: datetime.datetime(2019, 5, 15, 16, 15, 46, 960211)    

In [5]: dateparser.parse("now + 2hr")                                                                                                                                                                                                                                           
Out[5]: datetime.datetime(2019, 5, 15, 15, 15, 52, 693479)                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                
In [6]: dateparser.parse("now + 2hr")                                                                                                                                                                                                                                           
Out[6]: datetime.datetime(2019, 5, 15, 15, 15, 59, 263881)                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                
In [7]: dateparser.parse("now + 1 hour")                                                                                                                                                                                                                                        
Out[7]: datetime.datetime(2019, 5, 15, 16, 16, 44, 824766)                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                
In [8]: dateparser.parse("now + 10 minutes")                                                                                                                                                                                                                                    
Out[8]: datetime.datetime(2019, 5, 15, 17, 7, 9, 543897)

I tried both version 0.7.0 and 0.6.0.

Start by reproducing the examples through dateparser.parse, especially the differing results for "now + 1hr" and "now - 1hr". Trace the relative-expression parsing entry point and verify that plus applies a forward offset while minus applies a backward offset, including the hour and minute examples.