1 files changed, 25 insertions, 0 deletions
diff --git a/server/src/Util/Time.hs b/server/src/Util/Time.hs
new file mode 100644
index 0000000..3e0856d
--- /dev/null
+++ b/server/src/Util/Time.hs
@@ -0,0 +1,25 @@
+module Util.Time
+  ( belongToCurrentMonth
+  , belongToCurrentWeek
+  , timeToDay
+  ) where
+
+import           Data.Time.Calendar
+import           Data.Time.Calendar.WeekDate (toWeekDate)
+import           Data.Time.Clock             (UTCTime, getCurrentTime)
+import           Data.Time.LocalTime
+
+belongToCurrentMonth :: UTCTime -> IO Bool
+belongToCurrentMonth time = do
+  (timeYear, timeMonth, _) <- toGregorian <$> timeToDay time
+  (actualYear, actualMonth, _) <- toGregorian <$> (getCurrentTime >>= timeToDay)
+  return (actualYear == timeYear && actualMonth == timeMonth)
+
+belongToCurrentWeek :: UTCTime -> IO Bool
+belongToCurrentWeek time = do
+  (timeYear, timeWeek, _) <- toWeekDate <$> timeToDay time
+  (actualYear, actualWeek, _) <- toWeekDate <$> (getCurrentTime >>= timeToDay)
+  return (actualYear == timeYear && actualWeek == timeWeek)
+
+timeToDay :: UTCTime -> IO Day
+timeToDay time = localDay . (flip utcToLocalTime time) <$> getTimeZone time