Update date filter to allow quoting values in single quotes

src/khoj/processor/conversation/prompts.py

@@ -102,7 +102,7 @@ A: You visited the Angkor Wat Temple in Cambodia with Pablo, Namita and Xi.
 
 Q: What national parks did I go to last year?
 
-["National park I visited in {last_new_year} dt>="{last_new_year_date}" dt<"{current_new_year_date}""]
+["National park I visited in {last_new_year} dt>='{last_new_year_date}' dt<'{current_new_year_date}'"]
 
 A: You visited the Grand Canyon and Yellowstone National Park in {last_new_year}.
 

src/khoj/search_filter/date_filter.py

@@ -23,7 +23,7 @@ class DateFilter(BaseFilter):
     # - dt>="yesterday" dt<"tomorrow"
     # - dt>="last week"
     # - dt:"2 years ago"
-    date_regex = r"dt([:><=]{1,2})\"(.*?)\""
+    date_regex = r"dt([:><=]{1,2})[\"'](.*?)[\"']"
 
     def __init__(self, entry_key="raw"):
         self.entry_key = entry_key