daysToMilliseconds — GTM Variable Template for Date

VARIABLES › DATE

daysToMilliseconds EXTENDED Date

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

Converts days to milliseconds.

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When to Use This

Time Operations

Measure durations, calculate elapsed time, and format timestamps.

Type Conversion

Safely convert between data types — strings, numbers, booleans, arrays, objects.

Date & Time

Calculate durations, differences, and time-based operations on date values.

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Examples

Days to milliseconds▶ Try

INPUT

Number of Days: 1

OUTPUT

86400000

Zero returns 0▶ Try

INPUT

Number of Days: 0

OUTPUT

0

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Live Sandbox

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

daysToMilliseconds

Read-Only Try Live

Number of Days

💾 The number of days to convert to milliseconds.

Supported formats:
  ✓ Number
  ✓ String

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.

Number of Days 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.

daysToMilliseconds()

+ Chain another variable

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Related Variables

Same category: Date

→ addDays → basicDateToExtended → calculateDaysDifference → calculateLeadTime → currentTimestamp → dateToUnixTimestamp → extendedDateToBasic → getDayIndexFromDateString → getDayName → getDayNameFromDateString → getDayNameShort → getHourOfDay → getMonthName → getMonthNameShort → hoursToMilliseconds → isBusinessHours → isWeekend → millisecondsToDays → millisecondsToHours → millisecondsToMinutes → millisecondsToSeconds → minutesToMilliseconds → reverseDateCompactDay1st → reverseDateCompactYear1st → reverseDateSlash → secondsToMilliseconds → subtractDays → timestampToDayIndex → unixTimestampToDate

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Under the Hood

📜 View Implementation Code

/**
* Converts a number of days to milliseconds.
*
* @param {string|number} data.src - The number of days to convert to milliseconds.
* @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 conversion.
*
* @returns {number|undefined} The time in milliseconds, or undefined if input is not a valid number.
*
* @framework ggLowCodeGTMKit
*/
const makeNumber = require('makeNumber');

const daysToMilliseconds = function(timeValue) {
   const timeNum = makeNumber(timeValue);
   if (timeNum === timeNum) {
       return timeNum * 1000 * 60 * 60 * 24;
   }
   return undefined;
};

const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);

// ===============================================================================
// daysToMilliseconds - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(daysToMilliseconds(value));
// ===============================================================================
// daysToMilliseconds() – Apply Mode
// ===============================================================================
/*
return function(value) {
  return out(daysToMilliseconds(value));
};
*/

🧪 View Test Scenarios (5 tests)

✅ '[example] Days to milliseconds'
✅ String number of days - converts to milliseconds
✅ Decimal days - converts fractional days correctly
✅ Invalid string input - returns undefined
✅ '[example] Zero returns 0'