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title: $System.OriginDateTime
collection: developer
version: current
locale: en-us
portal_url: https://docs.salesforce.com/developer/current/en-us/platform/salesforce-pages-developers-guide/guides/pages/variables/pages-variables-global-systemorigindatetime.md
canonical_url: https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-variables-global-systemorigindatetime.html
source_site: developer.salesforce.com
content_type: documentation
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  - Visualforce Developer Guide
  - Platform Developer Content
---

# $System.OriginDateTime

A global merge field that represents the literal value of 1900-01-01 00:00:00.

## Usage

Use this global variable when performing date/time offset calculations, or to assign a literal value to a date/time field.

## Example

The following example calculates the number of days that have passed since January 1, 1900:

```nolang
{!NOW() - $System.OriginDateTime}
```