TSC Help


This is an online help for the UVIT Time Stamp Converter (TSC), a javascript tool to convert between the timestamps in UVIT Level 1 data files (science and aux data files) and calendar date/time (UT). Please report to us If you come across any inconsistent results.

You may find this tool useful If you have UVIT Level 1 datafiles and would like to quickly check the time corresponding to any data point, be it the time tag of an event or instrument parameters.

Given below is a brief description of the input fields and the calculations. Each of the user inputs should be numbers. Anything else would end up with unexpected results, mostly "NaN" in the text fields.

How to Use

Type in or edit any of the fields and click anywhere outside the box so that focus/cursor is changed. All other fields will be updated as per the new value in the field. For eg., You can type in a timestamp value in the input field to get the corresponding calendar date/time. You may also change any field in calendar date/time area to view the corresponding timestamp.

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The UVIT Time Stamp

UVIT Level 1 data consists of fits binary tables. All data points, ranging from photon events (FUV, NUV), image frames (VIS), engineering data (for eg., filter wheel position, SSM movement flag, sun/moon angles, etc.) are time tagged. These time values, the UVIT timestamps, are stored as seconds from 2016-01-01 midnight (UT). Datatype is double-precision floating point (8 bytes).

Calendar Date and Time

The date/time is the calendar date and time in UT, corresponding to the UVIT Time Stamp displayed in the field above.

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Versions, Changelog and TODO

Present Version: 1.0

Release Date: 01 December, 2016


  • Initial Release: 1.0, 01 December, 2016

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