diff --git a/README.md b/README.md
index cc04139..145991d 100644
--- a/README.md
+++ b/README.md
@@ -94,6 +94,14 @@ All options are optional, including the `el`.
     format: 'DD/MM/YY', 
     //  the default value of the picker
     default: moment(),
+    // language
+    locale: 'en',  /* set any locale, available in moment.js. Default - english */
+    okLabel: 'OK',  /* set custom name for 'OK' button. Default - 'OK' */
+    cancelLabel: 'Cancel',  /* set custom name for 'Cancel' button. Default - 'Cancel' */
+    dayFormat: 'Do',  /* set Day of Month format as for moment.js object. Default - 'Do'
+                    'D'  for  1 2 ... 30 31
+                    'Do'  for  1st 2nd ... 30th 31st
+                    'DD'  for  01 02 ... 30 31 */
     // the container to append the picker. If you change this, you need to make
     // sure your element has a z-index > 0 so that it displays in front of the scrim.
     container: document.body,    
diff --git a/lib/js/index.js b/lib/js/index.js
index 543988e..04b3e96 100644
--- a/lib/js/index.js
+++ b/lib/js/index.js
@@ -39,6 +39,11 @@ const defaults = () => ({
   },
   // format to display in the input, or set on the element
   format: 'DD/MM/YY',
+  // language
+  locale: 'en',
+  okLabel: 'OK',
+  cancelLabel: 'Cancel',
+  dayFormat: 'Do',
   // the container to append the picker
   container: document.body,
   // allow any dates
@@ -67,12 +72,15 @@ class DateTimePicker extends Events {
   // style options
   initializeRome(container, validator) {
     const onData = this.onChangeDate.bind(this);
-
+    const weekDays = moment.localeData(this.options.locale)._weekdaysMin;
+    const startWeek = moment.localeData(this.options.locale)._week.dow;
     return rome(container, {
       styles: this.options.styles,
       time: false,
       dateValidator: validator,
-      initialValue: this.value
+      initialValue: this.value,
+      weekdayFormat: weekDays,
+      weekStart: startWeek
     }).on('data', onData);
   }
 
@@ -80,7 +88,7 @@ class DateTimePicker extends Events {
   open() {
     const scrimEl = scrimTemplate(this.options);
     _appendTemplate(document.body, scrimEl);
-    _appendTemplate(this.options.container, popupTemplate());
+    _appendTemplate(this.options.container, popupTemplate(this.options.okLabel, this.options.cancelLabel));
     this.pickerEl = this.options.container.querySelector(`.${prefix}`);
     this.scrimEl = document.body.querySelector(`.${this.options.styles.scrim}`);
     this.amToggleEl = this.$('.c-datepicker__clock--am');
@@ -94,7 +102,7 @@ class DateTimePicker extends Events {
       // For now this allows us to set the default time using the same quantize
       // rules as setting the date explicitly. Setting this.value meets setTime|Date's
       // expectation that we have a value, and `0` guarantees that we will detect
-      this.value = moment(0);
+      this.value = moment(0).locale(this.options.locale);
       this.setDate(this.options.default);
       this.setTime(this.options.default);
     } else {
@@ -365,9 +373,9 @@ class DateTimePicker extends Events {
   // the calendar will be updated automatically
   // by rome when clicked
   setDate(date) {
-    const m = moment(date);
+    const m = moment(date).locale(this.options.locale);
     const month = m.format('MMM');
-    const day = m.format('Do');
+    const day = m.format(this.options.dayFormat);
     const dayOfWeek = m.format('dddd');
     const year = m.format('YYYY');
 
@@ -383,7 +391,7 @@ class DateTimePicker extends Events {
   // set the value and header elements to `time`
   // also update the hands of the clock
   setTime(time) {
-    const m = moment(time);
+    const m = moment(time).locale(this.options.locale);
     const minuteAsInt = Math.round(parseInt(m.format('mm'), 10) / 5) * 5;
     m.minutes(minuteAsInt);
 
diff --git a/lib/template/datepicker.template.js b/lib/template/datepicker.template.js
index ccfbca4..78a1ff0 100644
--- a/lib/template/datepicker.template.js
+++ b/lib/template/datepicker.template.js
@@ -1,4 +1,4 @@
-export default () => `
+export default (okLabel, cancelLabel) => `
 <div class="c-datepicker">
   <a class="c-datepicker__toggle c-datepicker__toggle--right c-datepicker--show-time js-show-clock" title="show time picker">
   </a>
@@ -69,8 +69,8 @@ export default () => `
     </div>
   </div>
   <div class="modal-btns">
-    <a class="c-btn c-btn--flat js-cancel">Cancel</a>
-    <a class="c-btn c-btn--flat js-ok">OK</a>
+    <a class="c-btn c-btn--flat js-cancel">${cancelLabel}</a>
+    <a class="c-btn c-btn--flat js-ok">${okLabel}</a>
   </div>
 </div>
 `;