fix: Correct styling issue in datepicker

examples/bootstrap4/app.py

+import datetime
 import os
 import os.path as op
 from flask import Flask
@@ -27,6 +28,7 @@ class User(db.Model):
     name = db.Column(db.Unicode(64))
     email = db.Column(db.Unicode(64))
     active = db.Column(db.Boolean, default=True)
+    created_at = db.Column(db.DateTime, default=datetime.datetime.now)
 
     def __unicode__(self):
         return self.name

flask_admin/static/vendor/bootstrap-daterangepicker/daterangepicker-bs4.css

+/*!
+ * Stylesheet for the Date Range Picker, for use with Bootstrap 3.x
+ *
+ * Copyright 2013-2015 Dan Grossman ( http://www.dangrossman.info )
+ * Licensed under the MIT license. See http://www.opensource.org/licenses/mit-license.php
+ *
+ * Built for http://www.improvely.com
+ */
+
+ .daterangepicker.dropdown-menu {
+  max-width: none;
+  z-index: 3000;
+}
+
+.daterangepicker.opensleft .ranges, .daterangepicker.opensleft .calendar {
+  float: left;
+  margin: 4px;
+}
+
+.daterangepicker.opensright .ranges, .daterangepicker.opensright .calendar,
+.daterangepicker.openscenter .ranges, .daterangepicker.openscenter .calendar {
+  float: right;
+  margin: 4px;
+}
+
+.daterangepicker.single .ranges, .daterangepicker.single .calendar {
+  float: none;
+}
+
+.daterangepicker .ranges {
+  width: 160px;
+  text-align: left;
+}
+
+.daterangepicker .ranges .range_inputs>div {
+  float: left;
+}
+
+.daterangepicker .ranges .range_inputs>div:nth-child(2) {
+  padding-left: 11px;
+}
+
+.daterangepicker .calendar {
+  display: none;
+  max-width: 270px;
+}
+
+.daterangepicker.show-calendar .calendar {
+    display: block;
+}
+
+.daterangepicker .calendar.single .calendar-date {
+  border: none;
+}
+
+.daterangepicker .calendar th, .daterangepicker .calendar td {
+  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
+  white-space: nowrap;
+  text-align: center;
+  min-width: 32px;
+}
+
+.daterangepicker .daterangepicker_start_input label,
+.daterangepicker .daterangepicker_end_input label {
+  color: #333;
+  display: block;
+  font-size: 0.6875rem;
+  font-weight: normal;
+  height: 20px;
+  line-height: 20px;
+  margin-bottom: 2px;
+  text-shadow: #fff 1px 1px 0px;
+  text-transform: uppercase;
+  width: 74px;
+}
+
+.daterangepicker .ranges input {
+  font-size: 0.6875rem;
+}
+
+.daterangepicker .ranges .input-mini {
+  border: 1px solid #ccc;
+  border-radius: 4px;
+  color: #555;
+  display: block;
+  font-size: 11px;
+  height: 30px;
+  line-height: 30px;
+  vertical-align: middle;
+  margin: 0 0 10px 0;
+  padding: 0 6px;
+  width: 74px;
+}
+
+.daterangepicker .ranges ul {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+.daterangepicker .ranges li {
+  font-size: 0.8125rem;
+  background: #f5f5f5;
+  border: 1px solid #f5f5f5;
+  color: #08c;
+  padding: 3px 12px;
+  margin-bottom: 8px;
+  -webkit-border-radius: 5px;
+  -moz-border-radius: 5px;
+  border-radius: 5px;
+  cursor: pointer;
+}
+
+.daterangepicker .ranges li.active, .daterangepicker .ranges li:hover {
+  background: #08c;
+  border: 1px solid #08c;
+  color: #fff;
+}
+
+.daterangepicker .calendar-date {
+  border: 1px solid #ddd;
+  padding: 4px;
+  border-radius: 4px;
+  background: #fff;
+}
+
+.daterangepicker .calendar-time {
+  text-align: center;
+  margin: 8px auto 0 auto;
+  line-height: 30px;
+}
+
+.daterangepicker {
+  position: absolute;
+  background: #fff;
+  top: 100px;
+  left: 20px;
+  padding: 4px;
+  margin-top: 1px;
+  -webkit-border-radius: 4px;
+  -moz-border-radius: 4px;
+  border-radius: 4px;
+}
+
+.daterangepicker.opensleft:before {
+  position: absolute;
+  top: -7px;
+  right: 9px;
+  display: inline-block;
+  border-right: 7px solid transparent;
+  border-bottom: 7px solid #ccc;
+  border-left: 7px solid transparent;
+  border-bottom-color: rgba(0, 0, 0, 0.2);
+  content: '';
+}
+
+.daterangepicker.opensleft:after {
+  position: absolute;
+  top: -6px;
+  right: 10px;
+  display: inline-block;
+  border-right: 6px solid transparent;
+  border-bottom: 6px solid #fff;
+  border-left: 6px solid transparent;
+  content: '';
+}
+
+.daterangepicker.openscenter:before {
+  position: absolute;
+  top: -7px;
+  left: 0;
+  right: 0;
+  width: 0;
+  margin-left: auto;
+  margin-right: auto;
+  display: inline-block;
+  border-right: 7px solid transparent;
+  border-bottom: 7px solid #ccc;
+  border-left: 7px solid transparent;
+  border-bottom-color: rgba(0, 0, 0, 0.2);
+  content: '';
+}
+
+.daterangepicker.openscenter:after {
+  position: absolute;
+  top: -6px;
+  left: 0;
+  right: 0;
+  width: 0;
+  margin-left: auto;
+  margin-right: auto;
+  display: inline-block;
+  border-right: 6px solid transparent;
+  border-bottom: 6px solid #fff;
+  border-left: 6px solid transparent;
+  content: '';
+}
+
+.daterangepicker.opensright:before {
+  position: absolute;
+  top: -7px;
+  left: 9px;
+  display: inline-block;
+  border-right: 7px solid transparent;
+  border-bottom: 7px solid #ccc;
+  border-left: 7px solid transparent;
+  border-bottom-color: rgba(0, 0, 0, 0.2);
+  content: '';
+}
+
+.daterangepicker.opensright:after {
+  position: absolute;
+  top: -6px;
+  left: 10px;
+  display: inline-block;
+  border-right: 6px solid transparent;
+  border-bottom: 6px solid #fff;
+  border-left: 6px solid transparent;
+  content: '';
+}
+
+.daterangepicker.dropup{
+  margin-top: -5px;
+}
+.daterangepicker.dropup:before{
+  top: initial;
+  bottom:-7px;
+  border-bottom: initial;
+  border-top: 7px solid #ccc;
+}
+.daterangepicker.dropup:after{
+  top: initial;
+  bottom:-6px;
+  border-bottom: initial;
+  border-top: 6px solid #fff;
+}
+
+.daterangepicker table {
+  width: 100%;
+  margin: 0;
+}
+
+.daterangepicker td, .daterangepicker th {
+  text-align: center;
+  width: 20px;
+  height: 20px;
+  -webkit-border-radius: 4px;
+  -moz-border-radius: 4px;
+  border-radius: 4px;
+  cursor: pointer;
+  white-space: nowrap;
+}
+
+.daterangepicker td.off {
+  color: #999;
+}
+
+.daterangepicker td.disabled, .daterangepicker option.disabled {
+  color: #999;
+}
+
+.daterangepicker td.available:hover, .daterangepicker td.available.today, .daterangepicker th.available:hover {
+  background: #eee;
+}
+
+.daterangepicker td.in-range {
+  background: #ebf4f8;
+  -webkit-border-radius: 0;
+  -moz-border-radius: 0;
+  border-radius: 0;
+}
+
+.daterangepicker td.start-date {
+  -webkit-border-radius: 4px 0 0 4px;
+  -moz-border-radius: 4px 0 0 4px;
+  border-radius: 4px 0 0 4px;
+}
+
+.daterangepicker td.end-date {
+  -webkit-border-radius: 0 4px 4px 0;
+  -moz-border-radius: 0 4px 4px 0;
+  border-radius: 0 4px 4px 0;
+}
+
+.daterangepicker td.start-date.end-date {
+  -webkit-border-radius: 4px;
+  -moz-border-radius: 4px;
+  border-radius: 4px;
+}
+
+.daterangepicker td.today.active, .daterangepicker td.active, .daterangepicker td.active:hover {
+  background-color: #357ebd;
+  border-color: #3071a9;
+  color: #fff;
+}
+
+.daterangepicker td.week, .daterangepicker th.week {
+  font-size: 80%;
+  color: #ccc;
+}
+
+.daterangepicker select.monthselect, .daterangepicker select.yearselect {
+  font-size: 0.75rem;
+  padding: 1px;
+  height: auto;
+  margin: 0;
+  cursor: default;
+}
+
+.daterangepicker select.monthselect {
+  margin-right: 2%;
+  width: 56%;
+}
+
+.daterangepicker select.hourselect, .daterangepicker select.minuteselect, .daterangepicker select.secondselect, .daterangepicker select.ampmselect {
+  margin-bottom: 0;
+}
+
+.daterangepicker_start_input {
+  float: left;
+}
+
+.daterangepicker_end_input {
+  float: left;
+  padding-left: 11px
+}
+
+.daterangepicker th.month {
+  width: auto;
+}
+
+/*.daterangepicker.dropdown-menu.single.opensright.show-calendar:after {*/
+/*    padding: 40px !important;*/
+/*    margin: 40px !important;*/
+/*}*/
\ No newline at end of file

flask_admin/templates/bootstrap4/admin/lib.html

@@ -242,7 +242,7 @@
 {% macro form_css() %}
   <link href="{{ admin_static.url(filename='vendor/select2/select2.css', v='4.2.1') }}" rel="stylesheet">
   <link href="{{ admin_static.url(filename='vendor/select2/select2-bootstrap4.css', v='1.4.6') }}" rel="stylesheet">
-  <link href="{{ admin_static.url(filename='vendor/bootstrap-daterangepicker/daterangepicker-bs3.css', v='1.3.22') }}" rel="stylesheet">
+  <link href="{{ admin_static.url(filename='vendor/bootstrap-daterangepicker/daterangepicker-bs4.css', v='1.3.22') }}" rel="stylesheet">
   {% if config.MAPBOX_MAP_ID %}
   <link href="{{ admin_static.url(filename='vendor/leaflet/leaflet.css', v='1.0.2') }}" rel="stylesheet">
   <link href="{{ admin_static.url(filename='vendor/leaflet/leaflet.draw.css', v='0.4.6') }}" rel="stylesheet">