diff --git a/javascripts/src/lib/vjf_rules.ts b/javascripts/src/lib/vjf_rules.ts
index 795e5468..ad40e006 100644
--- a/javascripts/src/lib/vjf_rules.ts
+++ b/javascripts/src/lib/vjf_rules.ts
@@ -1,6 +1,7 @@
 // License: LGPL-3.0-or-later
 import * as Regex from './regex'
 import {Field, Form} from "mobx-react-form";
+import moment = require("moment");
 
 
 interface ValidationInput {
@@ -42,6 +43,35 @@ export class Validations  {
     ]
   }
 
+  static isNumber({field, validator}:ValidationInput):StringBoolTuple {
+    return [
+      !isNaN(parseFloat(field.value)),
+      `${field.label} must be a number`
+    ]
+  }
+
+
+  static isGreaterThanOrEqualTo(value:number) : ({field, validator}:ValidationInput) => StringBoolTuple
+  {
+    return ({field, validator}:ValidationInput) => {
+      return [
+        parseFloat(field.value) >= value,
+        `${field.label} must be at least ${value}`
+      ]
+    }
+  }
+
+  static isLessThanOrEqualTo(value:number, flip:boolean=false) : ({field, validator}:ValidationInput) => StringBoolTuple
+  {
+    return ({field, validator}:ValidationInput) => {
+      let float = parseFloat(field.value)
+      return [
+        (flip ? -1 * float : float) <= value,
+        `${field.label} must be no more than ${value}`
+      ]
+    }
+  }
+
   static optional(validation:Validation) : Validation {
     return ({field, form, validator}:ValidationInput) => {
       if (!field.value || validator.isEmpty(field.value)){
@@ -53,5 +83,15 @@ export class Validations  {
     };
   }
 
+  static isDate(format:string): ({field, validator}:ValidationInput) => StringBoolTuple  {
+    return ({field, validator}:ValidationInput) => {
+      let m = moment(field.value, format, true);
+      return [
+        m.isValid(),
+        `${field.label} must be a date with format: ${format}`
+      ]
+    }
+  }
+
 
 }
\ No newline at end of file