isUnixTimestampMilliseconds — GTM Variable Template for Logic

VARIABLES › LOGIC

isUnixTimestampMilliseconds EXTENDED Logic

Direct (.tpl) Apply (.tpl) Add to GTM

Check if the input is a valid Unix timestamp in milliseconds format.

---

When to Use This

---

Examples

Valid ms timestamp▶ Try

INPUT

Value To Check: 1609459200000

OUTPUT

true

Zero returns false▶ Try

INPUT

Value To Check: 0

OUTPUT

false

---

Live Sandbox

This is what you'll see when you open this variable in Google Tag Manager. Hover the icons for details.

isUnixTimestampMilliseconds

Read-Only Try Live

Value To Check

💾 The value to check.

Supported formats:
  ✓ All

Input Setup

Input Function (optional)

⚙️ Optional pre-processing function applied to the input before internal logic (e.g., convert object to string, normalize case). Internal transformations such as case handling will still apply afterward.

Result Handling

Output Function (optional)

⚙️ Optional function to apply to the result before returning it (e.g., str => str + '€', val => val !== undefined for boolean conversion). Useful for chaining transformations on the output.

Value To Check number

💡 Type any text to see the result update live

🎯 Using special value — click input to type instead

Test with:

Falsy undefined null "" empty 0 false NaN

Truthy true 42 "hello" {} empty [] empty {a:1} [1,2,3]

🔗 Result Handling — Chain Variables

Chain apply-mode variables to the output. Each variable receives the result of the previous one.

isUnixTimestampMilliseconds()

+ Chain another variable

---

Related Variables

Same category: Logic

→ isArray → isDefined → isEmpty → isEmptyString → isEqualTo → isFalsy → isFunction → isGreaterThan → isGreaterThanOrEqualTo → isInRange → isInfinity → isInteger → isJSON → isLessThan → isLessThanOrEqualTo → isNaN → isNotArray → isNotEmptyString → isNotFunction → isNotJSON → isNotNaN → isNotNull → isNotNumber → isNotObject → isNotString → isNotURL → isNull → isNumber → isObject → isPrimitive → isSHA256 → isString → isStringifiedNumber → isTruthy → isURL → isUndefined → isUnixTimestamp → isUnixTimestampSeconds → isValidNumber → 🧩 AND → 🧩 IF (else) → 🧩 IF AND_OR → 🧩 IF ELSE IF (Advanced) → 🧩 IF ELSE IF (Predefined) → 🧩 NOT → 🧩 OR → 🧩 XOR

---

Under the Hood

📜 View Implementation Code

/**
 * Checks if the provided input is a valid Unix timestamp in milliseconds format.
 *
 * @param {any} data.src - The input value to check (could be a string or number).
 * @param {Function|string} [data.out] - Optional output handler: function to transform result or string with format.
 *
 * Direct-mode specific parameters:
 * @param {Function} [data.pre] - Optional pre-processor function to transform `src` before checking.
 *
 * @returns {boolean} True if the input is a valid Unix timestamp in milliseconds format, false otherwise.
 *
 * @framework ggLowCodeGTMKit
 */
const makeInteger = require('makeInteger');
const makeNumber = require('makeNumber');
const isUnixTimestampMilliseconds = function(value) {
    if (value === null || value === "") { return false;}
  const valueNum = makeNumber(value);
  const valueInt = makeInteger(value);
  if (typeof valueInt === 'number' && valueNum === valueInt) {
    return valueInt >= 1000000000000 && valueInt <= 8640000000000;  // Valid range for milliseconds
  }
  return false;
};
const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);
// ===============================================================================
// isUnixTimestampMilliseconds - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(isUnixTimestampMilliseconds(value));
// ===============================================================================
// isUnixTimestampMilliseconds() – Apply Mode
// ===============================================================================
/*
return function(value) {
   return out(isUnixTimestampMilliseconds(value));
};*/

🧪 View Test Scenarios (6 tests)

✅ '[example] Valid ms timestamp'
✅ String timestamp - should return true
✅ Decimal timestamp - should return false
✅ Too large timestamp - should return false
✅ '[example] Zero returns false'
✅ Empty String - should return false