Add RelativeDateTime component

src/types/RelativeDateTime.js

@@ -0,0 +1,35 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import Moment from 'moment'
+import DatePart from './DatePart'
+import Empty from './Empty'
+import {SHORTDATETIME_FORMAT} from '../utils'
+
+/**
+ * Displays a datetime relative to the current time eg. "4 days ago" or "in 3 hours"
+ * alongside the datetime passed in
+ */
+class RelativeDateTime extends React.Component {
+  static propTypes = {
+    value: PropTypes.string,
+  }
+
+  render() {
+    const date = Moment(this.props.value)
+    const isValid = date.isValid()
+    if (isValid) {
+      return (
+        <div>
+          <div>
+            {Moment(this.props.value).fromNow()}
+          </div>
+          <div className="text-muted">
+            <DatePart value={this.props.value} outputFormat={SHORTDATETIME_FORMAT} />
+          </div>
+        </div>
+      )
+    }
+    return (<Empty />)
+  }
+}
+export default RelativeDateTime

src/types/index.js

@@ -7,4 +7,5 @@ export DatePart from './DatePart'
 export DateTime from './DateTime'
 export BooleanType from './BooleanType'
 export RelativeDate from './RelativeDate'
+export RelativeDateTime from './RelativeDateTime'
 export Currency from './Currency'