1 files changed, 53 insertions, 0 deletions
diff --git a/platform/macos/app/TimeIntervalTransformer.m b/platform/macos/app/TimeIntervalTransformer.m
new file mode 100644
index 0000000000..39177dc5bc
--- /dev/null
+++ b/platform/macos/app/TimeIntervalTransformer.m
@@ -0,0 +1,53 @@
+#import "TimeIntervalTransformer.h"
+
+@implementation TimeIntervalTransformer
+
++ (Class)transformedValueClass {
+    return [NSString class];
+}
+
++ (BOOL)allowsReverseTransformation {
+    return NO;
+}
+
+NSString *NumberAndUnitString(NSInteger quantity, NSString *singular, NSString *plural) {
+    return [NSString stringWithFormat:@"%ld %@", quantity, quantity == 1 ? singular : plural];
+}
+
+- (id)transformedValue:(id)value {
+    if (![value isKindOfClass:[NSValue class]]) {
+        return nil;
+    }
+    
+    NSTimeInterval timeInterval = [value doubleValue];
+    NSInteger seconds = floor(timeInterval);
+    NSInteger minutes = floor(seconds / 60);
+    seconds -= minutes * 60;
+    NSInteger hours = floor(minutes / 60);
+    minutes -= hours * 60;
+    NSInteger days = floor(hours / 24);
+    hours -= days * 24;
+    NSInteger weeks = floor(days) / 7;
+    days -= weeks * 7;
+    
+    NSMutableArray *components = [NSMutableArray array];
+    if (seconds || timeInterval < 60) {
+        [components addObject:NumberAndUnitString(seconds, @"second", @"seconds")];
+    }
+    if (minutes) {
+        [components insertObject:NumberAndUnitString(minutes, @"minute", @"minutes") atIndex:0];
+    }
+    if (hours) {
+        [components insertObject:NumberAndUnitString(hours, @"hour", @"hours") atIndex:0];
+    }
+    if (days) {
+        [components insertObject:NumberAndUnitString(days, @"day", @"days") atIndex:0];
+    }
+    if (weeks) {
+        [components insertObject:NumberAndUnitString(weeks, @"week", @"weeks") atIndex:0];
+    }
+    
+    return [components componentsJoinedByString:@", "];
+}
+
+@end