Add DateTime::now method

src/datetime.rs

@@ -6,7 +6,10 @@ use {
         month::Month, weekday::Weekday, year::Year, zone::TimeZone, SECONDS_PER_DAY,
         SECONDS_PER_HOUR, SECONDS_PER_MINUTE,
     },
-    std::{cmp, fmt},
+    std::{
+        cmp, fmt,
+        time::{SystemTime, SystemTimeError, UNIX_EPOCH},
+    },
 };
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
@@ -149,13 +152,22 @@ impl DateTime {
         }
     }
 
+    #[allow(clippy::missing_panics_doc)]
+    /// Creates a `DateTime` from the system time
+    pub fn now() -> Result<Self, SystemTimeError> {
+        let now = SystemTime::now().duration_since(UNIX_EPOCH)?;
+        Ok(Self::from_timestamp(i64::try_from(now.as_secs()).unwrap()))
+    }
+
     #[allow(clippy::missing_panics_doc)]
     /// Gets the day of the week for this `DateTime`
     pub fn weekday(&self) -> Weekday {
         let ts = self.timestamp_naive();
         let mut days = ts / SECONDS_PER_DAY;
         // For negative timestamps this number is actually the following day
-        if ts < 0 { days -= 1 }
+        if ts < 0 {
+            days -= 1;
+        }
         // Rusts `%` operator is modulo, not modulus. We have to use the
         // operation which will gove the correct answer for either positive
         // or negative remainders