added dateFromOptions method to Utils

RCTAppleHealthKit/RCTAppleHealthKit+Utils.h

@@ -16,6 +16,7 @@
 + (NSPredicate *)predicateForSamplesOnDay:(NSDate *)date;
 + (NSPredicate *)predicateForSamplesOnDayFromTimestamp:(NSString *)timestamp;
 + (double)doubleValueFromOptions:(NSDictionary *)options;
++ (NSDate *)dateFromOptions:(NSDictionary *)options;
 + (NSDate *)dateFromOptionsDefaultNow:(NSDictionary *)options;
 + (HKUnit *)hkUnitFromOptions:(NSDictionary *)options;
 

RCTAppleHealthKit/RCTAppleHealthKit+Utils.m

@@ -57,6 +57,16 @@
 }
 
 
++ (NSDate *)dateFromOptions:(NSDictionary *)options {
+    NSString *dateString = [options objectForKey:@"date"];
+    NSDate *date;
+    if(dateString != nil){
+        date = [RCTAppleHealthKit parseISO8601DateFromString:dateString];
+    }
+    return date;
+}
+
+
 + (NSDate *)dateFromOptionsDefaultNow:(NSDictionary *)options {
     NSString *dateString = [options objectForKey:@"date"];
     if(dateString != nil){